Temperature conversion: Difference between revisions

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=={{header|Arturo}}==
{{task}}
<lang rebol>convertKelvins: function [k][
{{omit from|Lilypond}}
#[

celcius: k - 273.15
There are quite a number of temperature scales. For this task we will concentrate on four of the perhaps best-known ones:
fahrenheit: (k * 9/5.0)-459.67
[[wp:Kelvin|Kelvin]], [[wp:Degree Celsius|Celsius]], [[wp:Fahrenheit|Fahrenheit]], and [[wp:Degree Rankine|Rankine]].
rankine: k * 9/5.0

The Celsius and Kelvin scales have the same magnitude, but different null points.
: 0 degrees Celsius corresponds to 273.15 kelvin.
: 0 kelvin is absolute zero.

The Fahrenheit and Rankine scales also have the same magnitude, but different null points.

: 0 degrees Fahrenheit corresponds to 459.67 degrees Rankine.
: 0 degrees Rankine is absolute zero.

The Celsius/Kelvin and Fahrenheit/Rankine scales have a ratio of 5 : 9.


;Task
Write code that accepts a value of kelvin, converts it to values of the three other scales, and prints the result.


;Example:
<pre>
K 21.00

C -252.15

F -421.87

R 37.80
</pre>
<br><br>

=={{header|360 Assembly}}==
{{trans|AWK}}
Use of packed decimal arithmetic
(ZAP,SP,MP,DP,UNPK,CVD,EDMK opcodes).
<lang>* Temperature conversion 10/09/2015
TEMPERAT CSECT
USING TEMPERAT,R15
LA R4,1 i=1
LA R5,TT @tt(1)
LA R6,IDE @ide(1)
LOOPI CH R4,=AL2((T-TT)/8) do i=1 to hbound(tt)
BH ELOOPI
ZAP T,0(8,R5) t=tt(i)
CVD R4,DW store to packed decimal
UNPK PG(1),DW+7(1) unpack
OI PG,X'F0' zap sign
MVI PG+1,C' '
MVC PG+2(12),0(R6) ide(i)
XPRNT PG,14 output i
MVC PG(12),=C'Kelvin: '
MVC ZN,EDMASKN load mask
EDMK ZN,T+5 t (PL3)
BCTR R1,0 sign location
MVC 0(1,R1),ZN+L'ZN-1 put sign
MVC PG+12(L'ZN-1),ZN value
MVC PG+19(2),=C' K' unit
XPRNT PG,21 output Kelvin
MVC PG(12),=C'Celsius: '
ZAP DW,T t
SP DW,=P'273.15' t-273.15
MVC ZN,EDMASKN load mask
EDMK ZN,DW+5 (PL3)
BCTR R1,0 sign location
MVC 0(1,R1),ZN+L'ZN-1 put sign
MVC PG+12(L'ZN-1),ZN value
MVC PG+19(2),=C' C' unit
XPRNT PG,21 output Celsius
MVC PG(12),=C'Fahrenheit: '
ZAP DW,T t
MP DW,=P'18' *18
DP DW,=PL3'10' /10
ZAP DW,DW(5)
SP DW,=P'459.67' t*1.8-459.67
MVC ZN,EDMASKN load mask
EDMK ZN,DW+5 (PL3)
BCTR R1,0 sign location
MVC 0(1,R1),ZN+L'ZN-1 put sign
MVC PG+12(L'ZN-1),ZN value
MVC PG+19(2),=C' F' unit
XPRNT PG,21 output Fahrenheit
MVC PG(12),=C'Rankine: '
ZAP DW,T t
MP DW,=P'18' *18
DP DW,=PL3'10' /10
ZAP DW,DW(5) t*1.8
MVC ZN,EDMASKN load mask
EDMK ZN,DW+5 (PL3)
BCTR R1,0 sign location
MVC 0(1,R1),ZN+L'ZN-1 put sign
MVC PG+12(L'ZN-1),ZN value
MVC PG+19(2),=C' R' unit
XPRNT PG,21 output Rankine
LA R4,1(R4) i=i+1
LA R5,8(R5) @tt(i)
LA R6,12(R6) @ide(i)
B LOOPI
ELOOPI XR R15,R15
BR R14
IDE DC CL12'absolute',CL12'ice melts',CL12'water boils'
TT DC PL8'0.00',PL8'273.15',PL8'373.15'
T DS PL8
PG DS CL24
ZN DS ZL8 5num
DW DS D PL8 15num
EDMASKN DC X'402021204B202060' CL8 5num
YREGS
END TEMPERAT</lang>
{{out}}
<pre>
1 absolute
Kelvin: 0.00 K
Celsius: -273.15 C
Fahrenheit: -459.67 F
Rankine: 0.00 R
2 ice melts
Kelvin: 273.15 K
Celsius: 0.00 C
Fahrenheit: 32.00 F
Rankine: 491.67 R
3 water boils
Kelvin: 373.15 K
Celsius: 100.00 C
Fahrenheit: 212.00 F
Rankine: 671.67 R
</pre>

=={{header|8th}}==
<lang forth>: KtoC \ n -- n
273.15 n:-
;

: KtoF \ n -- n
1.8 n:* 459.67 n:-
;

: KtoR \ n -- n
1.8 n:*
;

: KtoCFR \ n --
dup dup dup
. " degrees Kelvin" . cr
KtoC
. " degrees Celcius" . cr
KtoF
. " degrees Fahrenheit" . cr
KtoR
. " degrees Rankine" . cr
;

: app:main \
argc 0 n:=
if
"Syntax" . cr " temp.8th number" . cr
else
0 args >n KtoCFR
then
bye
;
</lang>
{{out}}
<pre>>8th temp.8th 21
21 degrees Kelvin
-252.15000 degrees Celcius
-421.87000 degrees Fahrenheit
37.80000 degrees Rankine
</pre>

=={{header|Ada}}==

<lang Ada>with Ada.Float_Text_IO, Ada.Text_IO; use Ada.Float_Text_IO, Ada.Text_IO;

procedure Temperatur_Conversion is
K: Float;
function C return Float is (K - 273.15);
function F return Float is (K * 1.8 - 459.67);
function R return Float is (K * 1.8);
begin
Get(K); New_Line; -- Format
Put("K: "); Put(K, Fore => 4, Aft => 2, Exp => 0); New_Line;-- K: dddd.dd
Put("C: "); Put(C, Fore => 4, Aft => 2, Exp => 0); New_Line;-- C: dddd.dd
Put("F: "); Put(F, Fore => 4, Aft => 2, Exp => 0); New_Line;-- F: dddd.dd
Put("R: "); Put(R, Fore => 4, Aft => 2, Exp => 0); New_Line;-- R: dddd.dd
end;</lang>

{{out}}
<pre>21.0

K: 21.00
C: -252.15
F: -421.87
R: 37.80</pre>

=={{header|Aime}}==
<lang aime>void
show(integer symbol, real temperature)
{
o_form("%c /d2p2w8/\n", symbol, temperature);
}

integer
main(void)
{
real k;

k = atof(argv(1));

show('K', k);
show('C', k - 273.15);
show('F', k * 1.8 - 459.67);
show('R', k * 1.8);

return 0;
}</lang>
{{out}}
<pre>aime$ aime -a tmp/tconvert 300
K 300
C 26.85
F 80.32
R 540</pre>

=={{header|ALGOL 68}}==
<lang algol68>
BEGIN
REAL kelvin;
read (kelvin);
FORMAT f = $g(8,2), " K = ", g(8,2)xgl$;
printf ((f, kelvin, kelvin - 273.15, "C"));
printf ((f, kelvin, 9.0 * kelvin / 5.0, "R"));
printf ((f, kelvin, 9.0 * kelvin / 5.0 - 459.67, "F"))
END</lang>
{{out}}
<pre>$ echo 21 | a68g Temperature_conversion.a68
+21.00 K = -252.15 C
+21.00 K = +37.80 R
+21.00 K = -421.87 F
$ </pre>

=={{header|ALGOL-M}}==
If the temperature in Kelvin is a whole number, you should type a decimal point after it (e.g. <code>290.</code>): <code>290</code> with no decimal point will be interpreted as 0.29 rather than 290.0.
<lang algol>BEGIN
DECIMAL K, C, F, R;
WRITE( "Temperature in Kelvin:" );
READ( K );
C := K - 273.15;
F := K * 1.8 - 459.67;
R := K * 1.8;
WRITE( K, " Kelvin is equivalent to" );
WRITE( C, " degrees Celsius" );
WRITE( F, " degrees Fahrenheit" );
WRITE( R, " degrees Rankine" );
END</lang>

=={{header|APL}}==
Given a temperature in Kelvin, prints the equivalent in Kelvin, Celsius, Fahrenheit, and Rankine (in that order).
<lang apl> CONVERT←{⍵,(⍵-273.15),(R-459.67),(R←⍵×9÷5)}</lang>
{{out}}
<lang apl> CONVERT 21
21 ¯252.15 ¯421.87 37.8</lang>
The "high minus" character <tt>¯</tt> is used in APL to mark negative numbers, preventing any possible confusion with <tt>-</tt> (the subtraction operator).

=={{header|AppleScript}}==
{{Trans|JavaScript}} ( ES6 version )
<lang AppleScript>use framework "Foundation" -- Yosemite onwards, for the toLowerCase() function

-- KELVIN TO OTHER SCALE -----------------------------------------------------

-- kelvinAs :: ScaleName -> Num -> Num
on kelvinAs(strOtherScale, n)
heatBabel(n, "Kelvin", strOtherScale)
end kelvinAs

-- MORE GENERAL CONVERSION ---------------------------------------------------

-- heatBabel :: n -> ScaleName -> ScaleName -> Num
on heatBabel(n, strFromScale, strToScale)
set ratio to 9 / 5
set cels to 273.15
set fahr to 459.67
script reading
on |λ|(x, strFrom)
if strFrom = "k" then
x as real
else if strFrom = "c" then
x + cels
else if strFrom = "f" then
(fahr + x) * ratio
else
x / ratio
end if
end |λ|
end script
script writing
on |λ|(x, strTo)
if strTo = "k" then
x
else if strTo = "c" then
x - cels
else if strTo = "f" then
(x * ratio) - fahr
else
x * ratio
end if
end |λ|
end script
writing's |λ|(reading's |λ|(n, ¬
toLower(text 1 of strFromScale)), ¬
toLower(text 1 of strToScale))
end heatBabel


-- TEST ----------------------------------------------------------------------
on kelvinTranslations(n)
script translations
on |λ|(x)
{x, kelvinAs(x, n)}
end |λ|
end script
map(translations, {"K", "C", "F", "R"})
end kelvinTranslations

on run
script tabbed
on |λ|(x)
intercalate(tab, x)
end |λ|
end script
intercalate(linefeed, map(tabbed, kelvinTranslations(21)))
end run


-- GENERIC FUNCTIONS ---------------------------------------------------------

-- intercalate :: Text -> [Text] -> Text
on intercalate(strText, lstText)
set {dlm, my text item delimiters} to {my text item delimiters, strText}
set strJoined to lstText as text
set my text item delimiters to dlm
return strJoined
end intercalate

-- map :: (a -> b) -> [a] -> [b]
on map(f, xs)
tell mReturn(f)
set lng to length of xs
set lst to {}
repeat with i from 1 to lng
set end of lst to |λ|(item i of xs, i, xs)
end repeat
return lst
end tell
end map

-- Lift 2nd class handler function into 1st class script wrapper
-- mReturn :: Handler -> Script
on mReturn(f)
if class of f is script then
f
else
script
property |λ| : f
end script
end if
end mReturn

-- toLower :: String -> String
on toLower(str)
set ca to current application
((ca's NSString's stringWithString:(str))'s ¬
lowercaseStringWithLocale:(ca's NSLocale's currentLocale())) as text
end toLower</lang>
{{Out}}
<pre>K 21.0
C -252.15
F -421.87
R 37.8</pre>

----

Or of course:

<lang applescript>on convertFromKelvin(kelvinValue)
return ("K" & tab & (kelvinValue as real)) & ¬
(linefeed & "C" & tab & (kelvinValue - 273.15)) & ¬
(linefeed & "F" & tab & ((kelvinValue - 273.15) * 9 / 5 + 32)) & ¬
(linefeed & "R" & tab & (kelvinValue * 9 / 5))
end convertFromKelvin

convertFromKelvin(21)</lang>

Vanilla AppleScript actually has a handful of built-in measurement unit coercions, including three for converting between temperatures in Kelvin, Celsius, and Fahrenheit. There isn't one for Rankine, but it's an easy calculation from Kelvin:

<lang applescript>on convertFromKelvin(kelvinValue)
set kelvinMeasurement to kelvinValue as degrees Kelvin
set celsiusValue to kelvinMeasurement as degrees Celsius as number
set fahrenheitValue to kelvinMeasurement as degrees Fahrenheit as number
set rankineValue to kelvinValue * 9 / 5
return ("K" & tab & (kelvinValue as real)) & ¬
(linefeed & "C" & tab & celsiusValue) & ¬
(linefeed & "F" & tab & fahrenheitValue) & ¬
(linefeed & "R" & tab & rankineValue)
end convertFromKelvin

convertFromKelvin(21)</lang>

As from macOS 10.12 Sierra, macOS's Foundation framework too offers "Units and Measurement" classes and methods, which can be accessed from AppleScript using ASObjC code. They offer many more categories and units, although it's usually easier, faster, and more efficient (and occasionally more accurate!) to look up the conversion formulae on Wikipedia and write the math directly into the scripts, as above.

<lang applescript>use AppleScript version "2.5" -- macOS 10.12 (Sierra) or later
use framework "Foundation"

on convertFromKelvin(kelvinValue)
set |⌘| to current application
-- Set up an NSMeasurement object representing the given number of Kelvin units.
set kelvinUnit to |⌘|'s class "NSUnitTemperature"'s kelvin()
set kelvinMeasurement to |⌘|'s class "NSMeasurement"'s alloc()'s initWithDoubleValue:(kelvinValue) unit:(kelvinUnit)
-- Get value of the same measurement in each of the other "units" in turn.
set celsiusUnit to |⌘|'s class "NSUnitTemperature"'s celsius()
set celsiusMeasurement to kelvinMeasurement's measurementByConvertingToUnit:(celsiusUnit)
set celsiusValue to celsiusMeasurement's doubleValue()
set fahrenheitUnit to |⌘|'s class "NSUnitTemperature"'s fahrenheit()
set fahrenheitMeasurement to kelvinMeasurement's measurementByConvertingToUnit:(fahrenheitUnit)
set fahrenheitValue to fahrenheitMeasurement's doubleValue()
-- There's no predefined unit for Rankine (as at macOS 10.14 Mojave), but custom units are easy to define.
-- A unit's linear 'converter' must contain the unit's size and zero offset relative to those of its class's "base unit"
-- which for temperatures is the 'kelvin' unit.
set rankineConverter to |⌘|'s class "NSUnitConverterLinear"'s alloc()'s initWithCoefficient:(5 / 9) |constant|:(0)
set rankineUnit to |⌘|'s class "NSUnitTemperature"'s alloc()'s initWithSymbol:("°R") converter:(rankineConverter)
set rankineMeasurement to kelvinMeasurement's measurementByConvertingToUnit:(rankineUnit)
set rankineValue to rankineMeasurement's doubleValue()
return ("K" & tab & (kelvinValue as real)) & ¬
(linefeed & "C" & tab & celsiusValue) & ¬
(linefeed & "F" & tab & fahrenheitValue) & ¬
(linefeed & "R" & tab & rankineValue)
end convertFromKelvin

convertFromKelvin(21)</lang>

=={{header|AutoHotkey}}==
<lang AutoHotkey>MsgBox, % "Kelvin:`t`t 21.00 K`n"
. "Celsius:`t`t" kelvinToCelsius(21) " C`n"
. "Fahrenheit:`t" kelvinToFahrenheit(21) " F`n"
. "Rankine:`t`t" kelvinToRankine(21) " R`n"

kelvinToCelsius(k)
{
return, round(k - 273.15, 2)
}
kelvinToFahrenheit(k)
{
return, round(k * 1.8 - 459.67, 2)
}
kelvinToRankine(k)
{
return, round(k * 1.8, 2)
}</lang>
{{out}}
<pre>Kelvin: 21.00 K
Celsius: -252.15 C
Fahrenheit: -421.87 F
Rankine: 37.80 R</pre>

=={{header|AutoIt}}==
<lang AutoIt>; ### USAGE - TESTING PURPOSES ONLY

Local Const $_KELVIN = 21
ConsoleWrite("Kelvin: " & $_KELVIN & @CRLF)
ConsoleWrite("Kelvin: " & Kelvin(21, "C") & @CRLF)
ConsoleWrite("Kelvin: " & Kelvin(21, "F") & @CRLF)
ConsoleWrite("Kelvin: " & Kelvin(21, "R") & @CRLF)

; ### KELVIN TEMPERATURE CONVERSIONS

Func Kelvin($degrees, $conversion)
Select
Case $conversion = "C"
Return Round($degrees - 273.15, 2)
Case $conversion = "F"
Return Round(($degrees * 1.8) - 459.67, 2)
Case $conversion = "R"
Return Round($degrees * 1.8, 2)
EndSelect
EndFunc ;==> Kelvin</lang>
{{out}}
<pre>Kelvin: 21°
Celsius: -252.15°
Fahrenheit: -421.87°
Rankine: 37.8°</pre>

=={{header|AWK}}==
"Interactive" version, reading from stdin only:
<lang AWK># syntax: AWK -f TEMPERATURE_CONVERSION.AWK
BEGIN {
while (1) {
printf("\nKelvin degrees? ")
getline K
if (K ~ /^$/) {
break
}
if (K < 0) {
print("K must be >= 0")
continue
}
printf("K = %.2f\n",K)
printf("C = %.2f\n",K - 273.15)
printf("F = %.2f\n",K * 1.8 - 459.67)
printf("R = %.2f\n",K * 1.8)
}
exit(0)
}</lang>

"Regular" version, reading from input-file(s). <br>
With no such file, or "-" as filename, reading from stdin:

{{works with|gawk}} BEGINFILE is a gawk-extension
<lang AWK># usage: gawk -f temperature_conversion.awk input.txt -

BEGIN { print("# Temperature conversion\n") }
BEGINFILE { print "# reading", FILENAME
if( FILENAME=="-" ) print "# Please enter temperature values in K:\n"
}

!NF { exit }

{ print "Input:" $0 }
$1<0 { print("K must be >= 0\n"); next }
{ K = 0+$1
printf("K = %8.2f Kelvin degrees\n",K)
printf("C = %8.2f\n", K - 273.15)
printf("F = %8.2f\n", K * 1.8 - 459.67)
printf("R = %8.2f\n\n",K * 1.8)
}

END { print("# Bye.") }
</lang>

{{out|Input}} the numeric value of the first word in each line is used as input for the conversion
<pre>
-1
absolute
184
273.15 ice melts
310x
373.15 water boils
1941 Titanium melts
</pre>
So, "absolute" has a value of 0, and 310x is just 310.

After that file is read and processed, values are read from stdin. <br>
Here entering "333" by hand, and then stopping with an empty input.
{{out}}
<pre>
# Temperature conversion

# reading input.txt
Input:-1
K must be >= 0

Input:absolute
K = 0.00 Kelvin degrees
C = -273.15
F = -459.67
R = 0.00

Input:184
K = 184.00 Kelvin degrees
C = -89.15
F = -128.47
R = 331.20

Input:273.15 ice melts
K = 273.15 Kelvin degrees
C = 0.00
F = 32.00
R = 491.67

Input:310x
K = 310.00 Kelvin degrees
C = 36.85
F = 98.33
R = 558.00

Input:373.15 water boils
K = 373.15 Kelvin degrees
C = 100.00
F = 212.00
R = 671.67

Input:1941 Titanium melts
K = 1941.00 Kelvin degrees
C = 1667.85
F = 3034.13
R = 3493.80

# reading -
# Please enter temperature values in K:

Input:333
K = 333.00 Kelvin degrees
C = 59.85
F = 139.73
R = 599.40

# Bye.
</pre>

=={{header|BASIC}}==

<lang basic>
10 REM TRANSLATION OF AWK VERSION
20 INPUT "KELVIN DEGREES",K
30 IF K <= 0 THEN END: REM A VALUE OF ZERO OR LESS WILL END PROGRAM
40 LET C = K - 273.15
50 LET F = K * 1.8 - 459.67
60 LET R = K * 1.8
70 PRINT K; " KELVIN IS EQUIVALENT TO"
80 PRINT C; " DEGREES CELSIUS"
90 PRINT F; " DEGREES FAHRENHEIT"
100 PRINT R; " DEGREES RANKINE"
110 GOTO 20
</lang>

==={{header|IS-BASIC}}===
<lang IS-BASIC>100 INPUT PROMPT "Kelvin degrees: ":K
110 PRINT K;TAB(10);"Kelvin is equivalent to"
120 PRINT K-273.15;TAB(10);"Degrees Celsius"
130 PRINT K*1.8-459.67;TAB(10);"Degrees Fahrenheit"
140 PRINT K*1.8;TAB(10);"Degrees Rankine"</lang>

==={{header|Sinclair ZX81 BASIC}}===
<lang basic>10 PRINT "ENTER A TEMPERATURE IN KELVINS"
20 INPUT K
30 PRINT K;" KELVINS ="
40 PRINT K-273.15;" DEGREES CELSIUS"
50 PRINT K*1.8-459.67;" DEGREES FAHRENHEIT"
60 PRINT K*1.8;" DEGREES RANKINE"</lang>

==={{Header|Tiny BASIC}}===
<lang tiny basic>
PRINT "Temperature in Kelvin?"
INPUT K
LET C = K + 273
LET R = (9*K)/5
LET F = R + 460
PRINT C," Celsius"
PRINT F," Fahrenheit"
PRINT R," Rankine"</lang>

=={{header|BASIC256}}==
<lang basic256>
do
print "Kelvin degrees (>=0): ";
input K
until K>=0

print "K = " + string(K)
print "C = " + string(K - 273.15)
print "F = " + string(K * 1.8 - 459.67)
print "R = " + string(K * 1.8)
</lang>

=={{header|BBC BASIC}}==
<lang bbcbasic>
REPEAT
INPUT "Kelvin degrees (>=0): " K
UNTIL K>=0
@%=&20208
PRINT '"K = " K
PRINT "C = " K - 273.15
PRINT "F = " K * 1.8 - 459.67
PRINT "R = " K * 1.8
END
</lang>
{{out}}
<pre>
Kelvin degrees (>=0): 21

K = 21.00
C = -252.15
F = -421.87
R = 37.80
</pre>

=={{header|Befunge}}==
The temperature to convert is read from stdin. Befunge has no support for real numbers, though, so reading and writing of decimal values is done with character I/O. For the same reason, the temperature calculations use integer arithmetic to emulate fixed point. The first two lines handle the input; the second line performs the conversion calculations; and the last three handle the output.

<lang befunge>0000>0p~>"."-:!#v_2-::0\`\9`+!#v_$1>/\:3`#v_\>\:3 \`#v_v
1#<<^0 /2++g001!<1 \+g00\+*+55\< ^+55\-1< ^*+55\+1<v_
"K"\-+**"!Y]"9:\"C"\--\**"^CIT"/5*9:\"F"\/5*9:\"R"\0\0<v
v/+55\+*86%+55: /+55\+*86%+55: \0/+55+5*-\1*2 p00:`\0:,<
>"."\>:55+% 68*v >:#,_$55+,\:!#@_^
$_^#!:/+55\+< ^\" :"_<g00*95 </lang>

{{out}}
<pre>21
K: 21.00
C: -252.15
F: -421.87
R: 37.80</pre>

=={{header|Bracmat}}==
<lang bracmat>( ( rational2fixedpoint
= minus fixedpointnumber number decimals
. !arg:(#?number.~<0:~/#?decimals)
& ( !number:0&"0.0"
| ( !number:>0&
| -1*!number:?number&"-"
)
: ?minus
& !number+1/2*10^(-1*!decimals):?number
& !minus div$(!number.1) ".":?fixedpointnumber
& whl
' ( !decimals+-1:~<0:?decimals
& !fixedpointnumber
div$(mod$(!number.1)*10:?number.1)
: ?fixedpointnumber
)
& str$!fixedpointnumber
)
)
& ( fixedpoint2rational
= integerpart fractionalpart decimals
. @( !arg
: #?integerpart
( "." ?fractionalpart
| &0:?fractionalpart
)
)
& @(!fractionalpart:? #?fractionalpart [?decimals)
& !integerpart
+ (!integerpart:<0&-1|1)
* 10^(-1*!decimals)
* !fractionalpart
)
& whl
' ( put$"Enter Kelvin temperature:"
& fixedpoint2rational$(get'(,STR)):?kelvin
& !kelvin+-27315/100:?celcius
& (degree=.str$(chu$(x2d$b0) !arg))
& out$(rational2fixedpoint$(!kelvin.2) K)
& out$(rational2fixedpoint$(!celcius.2) degree$C)
& out$(rational2fixedpoint$(!celcius*9/5+32.2) degree$F)
& out$(rational2fixedpoint$(!kelvin*9/5.2) degree$Ra)
& out$(rational2fixedpoint$(!celcius*4/5.2) degree$Ré)
)
& done!
)</lang>
{{out}}
<pre>Enter Kelvin temperature:21.00
21.00 K
-252.15 °C
-421.87 °F
37.80 °Ra
-201.72 °Ré</pre>

=={{header|C}}==
<lang c>#include <stdio.h>
#include <stdlib.h>

double kelvinToCelsius(double k){
return k - 273.15;
}

double kelvinToFahrenheit(double k){
return k * 1.8 - 459.67;
}

double kelvinToRankine(double k){
return k * 1.8;
}
void convertKelvin(double kelvin) {
printf("K %.2f\n", kelvin);
printf("C %.2f\n", kelvinToCelsius(kelvin));
printf("F %.2f\n", kelvinToFahrenheit(kelvin));
printf("R %.2f", kelvinToRankine(kelvin));
}

int main(int argc, const char * argv[])
{
if (argc > 1) {
double kelvin = atof(argv[1]);
convertKelvin(kelvin);
}
return 0;
}</lang>

=={{header|C sharp|C#}}==
<lang csharp>using System;

namespace TemperatureConversion
{
class Program
{
static Func<double, double> ConvertKelvinToFahrenheit = x => (x * 1.8) - 459.67;
static Func<double, double> ConvertKelvinToRankine = x => x * 1.8;
static Func<double, double> ConvertKelvinToCelsius = x => x = 273.13;

static void Main(string[] args)
{
Console.Write("Enter a Kelvin Temperature: ");
string inputVal = Console.ReadLine();
double kelvinTemp = 0f;

if (double.TryParse(inputVal, out kelvinTemp))
{
Console.WriteLine(string.Format("Kelvin: {0}", kelvinTemp));
Console.WriteLine(string.Format("Fahrenheit: {0}", ConvertKelvinToFahrenheit(kelvinTemp)));
Console.WriteLine(string.Format("Rankine: {0}", ConvertKelvinToRankine(kelvinTemp)));
Console.WriteLine(string.Format("Celsius: {0}", ConvertKelvinToCelsius(kelvinTemp)));
Console.ReadKey();
}
else
{
Console.WriteLine("Invalid input value: " + inputVal);
}
}
}
}</lang>

<pre>
Enter a Kelvin Temperature: 21
Kelvin: 21
Fahrenheit: -421.87
Rankine: 37.8
Celsius: 273.13
</pre>

=={{header|C++}}==
<lang cpp>
#include <iostream>
#include <iomanip>

//--------------------------------------------------------------------------------------------------
using namespace std;

//--------------------------------------------------------------------------------------------------
class converter
{
public:
converter() : KTC( 273.15f ), KTDel( 3.0f / 2.0f ), KTF( 9.0f / 5.0f ), KTNew( 33.0f / 100.0f ),
KTRank( 9.0f / 5.0f ), KTRe( 4.0f / 5.0f ), KTRom( 21.0f / 40.0f ) {}

void convert( float kelvin )
{
float cel = kelvin - KTC,
del = ( 373.15f - kelvin ) * KTDel,
fah = kelvin * KTF - 459.67f,
net = cel * KTNew,
rnk = kelvin * KTRank,
rea = cel * KTRe,
rom = cel * KTRom + 7.5f;

cout << endl << left
<< "TEMPERATURES:" << endl
<< "===============" << endl << setw( 13 )
<< "CELSIUS:" << cel << endl << setw( 13 )
<< "DELISLE:" << del << endl << setw( 13 )
<< "FAHRENHEIT:" << fah << endl << setw( 13 )
<< "KELVIN:" << kelvin << endl << setw( 13 )
<< "NEWTON:" << net << endl << setw( 13 )
<< "RANKINE:" << rnk << endl << setw( 13 )
<< "REAUMUR:" << rea << endl << setw( 13 )
<< "ROMER:" << rom << endl << endl << endl;
}
private:
const float KTRank, KTC, KTF, KTRe, KTDel, KTNew, KTRom;
};
//--------------------------------------------------------------------------------------------------
int main( int argc, char* argv[] )
{
converter con;
float k;
while( true )
{
cout << "Enter the temperature in Kelvin to convert: ";
cin >> k;
con.convert( k );
system( "pause" );
system( "cls" );
}
return 0;
}
//--------------------------------------------------------------------------------------------------
</lang>
{{out}}
<pre>
Enter the temperature in Kelvin to convert: 373.15

TEMPERATURES:
===============
CELSIUS: 100
DELISLE: 0
FAHRENHEIT: 212
KELVIN: 373.15
NEWTON: 33
RANKINE: 671.67
REAUMUR: 80
ROMER: 60

</pre>

=={{header|Ceylon}}==
<lang ceylon>shared void run() {

void printKelvinConversions(Float kelvin) {
value celsius = kelvin - 273.15;
value rankine = kelvin * 9.0 / 5.0;
value fahrenheit = rankine - 459.67;
print("Kelvin: ``formatFloat(kelvin, 2, 2)``
Celsius: ``formatFloat(celsius, 2, 2)``
Fahrenheit: ``formatFloat(fahrenheit, 2, 2)``
Rankine: ``formatFloat(rankine, 2, 2)``");
}
printKelvinConversions(21.0);
}</lang>

=={{header|Clojure}}==
{{trans|Common Lisp}}
<lang clojure>(defn to-celsius [k]
(- k 273.15))
(defn to-fahrenheit [k]
(- (* k 1.8) 459.67))
(defn to-rankine [k]
(* k 1.8))
(defn temperature-conversion [k]
(if (number? k)
(format "Celsius: %.2f Fahrenheit: %.2f Rankine: %.2f"
(to-celsius k) (to-fahrenheit k) (to-rankine k))
(format "Error: Non-numeric value entered.")))</lang>

{{out}}
<pre>
user=> (temperature-conversion 21.0)
"Celsius: -252.15 Fahrenheit: -421.87 Rankine: 37.80"
</pre>

=={{header|COBOL}}==
{{works with|Visual COBOL}}
<lang cobol> IDENTIFICATION DIVISION.
PROGRAM-ID. temp-conversion.
DATA DIVISION.
WORKING-STORAGE SECTION.
78 Kelvin-Rankine-Ratio VALUE 0.5556. *> 5 / 9 to 4 d.p.
78 Kelvin-Celsius-Diff VALUE 273.15.
78 Rankine-Fahrenheit-Diff VALUE 459.67.
01 temp-kelvin PIC S9(8)V99.
01 temp-rankine PIC S9(8)V99.
01 kelvin PIC -(7)9.99.
01 celsius PIC -(7)9.99.
01 rankine PIC -(7)9.99.
01 fahrenheit PIC -(7)9.99.
PROCEDURE DIVISION.
DISPLAY "Enter a temperature in Kelvin to convert: " NO ADVANCING
ACCEPT temp-kelvin
MOVE temp-kelvin TO kelvin
DISPLAY "K " kelvin
SUBTRACT Kelvin-Celsius-Diff FROM temp-kelvin GIVING celsius
DISPLAY "C " celsius
DIVIDE temp-kelvin BY Kelvin-Rankine-Ratio
GIVING temp-rankine, rankine
SUBTRACT Rankine-Fahrenheit-Diff FROM temp-rankine GIVING fahrenheit
DISPLAY "F " fahrenheit
DISPLAY "R " rankine
GOBACK
.</lang>

{{out}}
<pre>
Enter a temperature in Kelvin to convert: 21
K 21.00
C -252.15
F -421.88
R 37.79
</pre>

=={{header|Common Lisp}}==
Three functions define the necessary conversion formulas. A fancy format string is used to print these values.

<lang lisp>
(defun to-celsius (k)
(- k 273.15))
(defun to-fahrenheit (k)
(- (* k 1.8) 459.67))
(defun to-rankine (k)
(* k 1.8))

(defun temperature-conversion ()
(let ((k (read)))
(if (numberp k)
(format t "Celsius: ~d~%Fahrenheit: ~d~%Rankine: ~d~%"
(to-celsius k) (to-fahrenheit k) (to-rankine k))
(format t "Error: Non-numeric value entered."))))
</lang>

{{out}}
<pre>
* (temperature-conversion)
21
Celsius: -252.15
Fahrenheit: -421.87003
Rankine: 37.8
NIL
</pre>

=={{header|D}}==
<lang d>double kelvinToCelsius(in double k) pure nothrow @safe {
return k - 273.15;
}

double kelvinToFahrenheit(in double k) pure nothrow @safe {
return k * 1.8 - 459.67;
}

double kelvinToRankine(in double k) pure nothrow @safe {
return k * 1.8;
}

unittest {
import std.math: approxEqual;
assert(approxEqual(kelvinToCelsius(21.0), -252.15));
assert(approxEqual(kelvinToFahrenheit(21.0), -421.87));
assert(approxEqual(kelvinToRankine(21.0), 37.8));
}

void main(string[] args) {
import std.stdio, std.conv, std.string;

if (args.length == 2 && isNumeric(args[1])) {
immutable kelvin = to!double(args[1]);
if (kelvin >= 0) {
writefln("K %2.2f", kelvin);
writefln("C %2.2f", kelvinToCelsius(kelvin));
writefln("F %2.2f", kelvinToFahrenheit(kelvin));
writefln("R %2.2f", kelvinToRankine(kelvin));
} else
writefln("%2.2f K is below absolute zero", kelvin);
}
}</lang>
{{out}}
<pre>
K 21.00

C -252.15

F -421.87

R 37.80
</pre>

=={{header|Delphi}}==
<lang delphi>
program Temperature;

{$APPTYPE CONSOLE}

uses
SysUtils;

type
TTemp = class
private
fCelsius, fFahrenheit, fRankine: double;
public
constructor Create(aKelvin: double);
property AsCelsius: double read fCelsius;
property AsFahrenheit: double read fFahrenheit;
property AsRankine: double read fRankine;
end;

{ TTemp }

constructor TTemp.Create(aKelvin: double);
begin
fCelsius := aKelvin - 273.15;
fRankine := aKelvin * 9 / 5;
fFahrenheit := fRankine - 459.67;
end;

var
kelvin: double;
temp: TTemp;

begin
write('Kelvin: ');
readln(kelvin);
temp := TTemp.Create(kelvin);
writeln(Format('Celsius: %.2f', [temp.AsCelsius]));
writeln(Format('Fahrenheit: %.2f', [temp.AsFahrenheit]));
writeln(Format('Rankine: %.2f', [temp.AsRankine]));
temp.Free;
readln;
end.
</lang>
{{out}}
<pre>
Kelvin: 21.00
Celsius: -252.15
F: -421.87
R: 37.80
</pre>

=={{header|EasyLang}}==

<lang>k = number input
print k & " °K"
print k - 273.15 & " °C"
print k * 1.8 - 459.67 & " °F"
print k * 1.8 & " °R"</lang>

=={{header|Elena}}==
ELENA 4.1 :
<lang elena>import extensions;
convertKelvinToFahrenheit(x)
= x * 1.8r - 459.6r;
convertKelvinToRankine(x)
= x * 1.8r;
convertKelvinToCelsius(x)
= x - 273.15r;
public program()
{
console.print("Enter a Kelvin Temperature: ");
var inputVal := console.readLine();
real kelvinTemp := 0.0r;
try
{
kelvinTemp := realConvertor.convert(inputVal)
}
catch(Exception e)
{
console.printLine("Invalid input value: ", inputVal);
AbortException.raise()
};
console.printLine("Kelvin: ", kelvinTemp);
console.printLine("Fahrenheit: ", convertKelvinToFahrenheit(kelvinTemp));
console.printLine("Rankine: ", convertKelvinToRankine(kelvinTemp));
console.printLine("Celsius: ", convertKelvinToCelsius(kelvinTemp));
console.readChar()
}</lang>
{{out}}
<pre>
Enter a Kelvin Temperature: 21
Kelvin: 21.0
Fahrenheit: -421.87
Rankine: 37.8
Celsius: -252.15
</pre>

=={{header|Elixir}}==
<lang elixir>defmodule Temperature do
def conversion(t) do
IO.puts "K : #{f(t)}"
IO.puts "\nC : #{f(t - 273.15)}"
IO.puts "\nF : #{f(t * 1.8 - 459.67)}"
IO.puts "\nR : #{f(t * 1.8)}"
end
defp f(a) do
Float.round(a, 2)
end
def task, do: conversion(21.0)
end

Temperature.task</lang>

{{out}}
<pre>
K : 21.0

C : -252.15

F : -421.87

R : 37.8
</pre>

=={{header|Erlang}}==
<lang erlang>% Implemented by Arjun Sunel
-module(temp_conv).
-export([main/0]).

main() ->
conversion(21).

conversion(T) ->
io:format("\nK : ~p\n\n",[f(T)]),
io:format("C : ~p \n\n",[f(T - 273.15)]),
io:format("F : ~p\n\n",[f(T * 1.8 - 459.67)]),
io:format("R : ~p\n\n",[f(T * 1.8)]).

f(A) ->
(round(A*100))/100 .
</lang>
{{out}}
<pre>
K : 21.0

C : -252.15

F : -421.87

R : 37.8

ok
</pre>

=={{header|Euphoria}}==
<lang OpenEuphoria>
include std/console.e

atom K
while 1 do
K = prompt_number("Enter temperature in Kelvin >=0: ",{0,4294967296})
printf(1,"K = %5.2f\nC = %5.2f\nF = %5.2f\nR = %5.2f\n\n",{K,K-273.15,K*1.8-459.67,K*1.8})
end while
</lang>
{{out}}
<pre>
Enter temperature in Kelvin >=0: 21
K = 21.00
C = -252.15
F = -421.87
R = 37.80

Enter temperature in Kelvin >=0:
</pre>

=={{header|Excel}}==
<lang>A1 : Kelvin
B1 : Celsius
C1 : Fahrenheit
D1 : Rankine
Name A2 : K
B2 : =K-273.15
C2 : =K*1.8-459.67
D2 : =K*1.8
Input in A1 </lang>
{{Out}}
<pre>
A B C D
1 Kelvin Celsius Fahrenheit Rankine
2 21 -252.15 -421.87 37.8
</pre>

=={{header|Ezhil}}==
<lang Ezhil>
# convert from Kelvin
நிரல்பாகம் கெல்வின்_இருந்து_மாற்று( k )
பதிப்பி "Kelvin: ",k,"Celsius: ",round(k-273.15)," Fahrenheit: ",(round(k*1.8 - 459.67))," Rankine: ",(round(k*1.8))
முடி

கெல்வின்_இருந்து_மாற்று( 0 ) #absolute zero
கெல்வின்_இருந்து_மாற்று( 273 ) #freezing pt of water
கெல்வின்_இருந்து_மாற்று( 30 + 273 ) #room temperature in Summer
</lang>

=={{header|F_Sharp|F#}}==
<lang fsharp>
// Define units of measure
[<Measure>] type k
[<Measure>] type f
[<Measure>] type c
[<Measure>] type r

// Define conversion functions
let kelvinToCelsius (t : float<k>) = ((float t) - 273.15) * 1.0<c>
let kelvinToFahrenheit (t : float<k>) = (((float t) * 1.8) - 459.67) * 1.0<f>
let kelvinToRankine (t : float<k>) = ((float t) * 1.8) * 1.0<r>

// Example code
let K = 21.0<k>
printfn "%A Kelvin is %A Celsius" K (kelvinToCelsius K)
printfn "%A Kelvin is %A Fahrenheit" K (kelvinToFahrenheit K)
printfn "%A Kelvin is %A Rankine" K (kelvinToRankine K)
</lang>

=={{header|Factor}}==
<lang>USING: combinators formatting kernel math ;
IN: rosetta-code.temperature

: k>c ( kelvin -- celsius ) 273.15 - ;
: k>r ( kelvin -- rankine ) 9/5 * ;
: k>f ( kelvin -- fahrenheit ) k>r 459.67 - ;

: convert ( kelvin -- )
{ [ ] [ k>c ] [ k>f ] [ k>r ] } cleave
"K %.2f\nC %.2f\nF %.2f\nR %.2f\n" printf ;
21 convert</lang>
{{out}}
<pre>
K 21.00
C -252.15
F -421.87
R 37.80
</pre>

=={{header|FOCAL}}==
<lang focal>01.10 ASK "TEMPERATURE IN KELVIN", K
01.20 TYPE "K ", %6.02, K, !
01.30 TYPE "C ", %6.02, K - 273.15, !
01.40 TYPE "F ", %6.02, K * 1.8 - 459.67, !
01.50 TYPE "R ", %6.02, K * 1.8, !</lang>
{{out}}
<pre>TEMPERATURE IN KELVIN:373.15
K = 373.15
C = 100.00
F = 212.00
R = 671.67</pre>

=={{header|Forth}}==
{{works with|GNU Forth}} for the command line handling
<lang forth>: k>°C ( F: kelvin -- celsius ) 273.15e0 f- ;
: k>°R ( F: kelvin -- rankine ) 1.8e0 f* ;
: °R>°F ( F: rankine -- fahrenheit ) 459.67e0 f- ;
: k>°F ( F: kelvin -- fahrenheit ) k>°R °R>°F ;
: main
argc 1 > if 1 arg >float
fdup f. ." K" cr
fdup k>°C f. ." °C" cr
fdup k>°F f. ." °F" cr
fdup k>°R f. ." °R" cr
then ;

main bye</lang>
{{out}}
<pre>&gt; gforthamd64 rosetta_temp_conv.fs 21
21. K
-252.15 °C
-421.87 °F
37.8 °R</pre>

=={{header|Fortran}}==
{{works with|Fortran|90 and later}}
<lang fortran>Program Temperature
implicit none
real :: kel, cel, fah, ran

write(*,*) "Input Kelvin temperature to convert"
read(*,*) kel

call temp_convert(kel, cel, fah, ran)
write(*, "((a10), f10.3)") "Kelvin", kel
write(*, "((a10), f10.3)") "Celsius", cel
write(*, "((a10), f10.3)") "Fahrenheit", fah
write(*, "((a10), f10.3)") "Rankine", ran
contains

subroutine temp_convert(kelvin, celsius, fahrenheit, rankine)
real, intent(in) :: kelvin
real, intent(out) :: celsius, fahrenheit, rankine

celsius = kelvin - 273.15
fahrenheit = kelvin * 1.8 - 459.67
rankine = kelvin * 1.8

end subroutine
end program</lang>

=={{header|FreeBASIC}}==
<lang freebasic>' FB 1.05.0 Win64

Sub convKelvin(temp As Double)
Dim f As String = "####.##"
Print Using f; temp;
Print " degrees Kelvin"
Print Using f; temp - 273.15;
Print " degrees Celsius"
Print Using f; (temp - 273.15) * 1.8 + 32.0;
Print " degrees Fahreneit"
Print Using f; (temp - 273.15) * 1.8 + 32.0 + 459.67;
Print " degrees Rankine"
End Sub

convKelvin(0.0)
Print
convKelvin(21.0)
Print
Print "Press any key to quit"
Sleep</lang>

{{out}}
<pre>
0.00 degrees Kelvin
-273.15 degrees Celsius
-459.67 degrees Fahreneit
0.00 degrees Rankine

21.00 degrees Kelvin
-252.15 degrees Celsius
-421.87 degrees Fahreneit
37.80 degrees Rankine
</pre>

=={{header|Gambas}}==
<lang gambas>Public Sub Form_Open()
Dim fKelvin As Float

fKelvin = InputBox("Enter a Kelvin value", "Kelvin converter")

Print "Kelvin =\t" & Format(Str(fKelvin), "#.00")
Print "Celsius =\t" & Format(Str(fKelvin - 273.15), "#.00")
Print "Fahrenheit =\t" & Format(Str(fKelvin * 1.8 - 459.67), "#.00")
Print "Rankine =\t" & Format(Str(fKelvin * 1.8), "#.00")

End</lang>
Output:
<pre>
Kelvin = 21.00
Celsius = -252.15
Fahrenheit = -421.87
Rankine = 37.80
</pre>

=={{header|Go}}==
<lang go>package main

import (
"fmt"
"os"
"strconv"
)

func main() {
if len(os.Args) != 2 {
fmt.Println("Usage: k <Kelvin>")
return
}
k, err := strconv.ParseFloat(os.Args[1], 64)
if err != nil {
fmt.Println(err)
return
}
if k < 0 {
fmt.Println("Kelvin must be >= 0.")
return
}
fmt.Printf("K %.2f\n", k)
fmt.Printf("C %.2f\n", k-273.15)
fmt.Printf("F %.2f\n", k*9/5-459.67)
fmt.Printf("R %.2f\n", k*9/5)
}</lang>
{{out}}
<pre>
> k 21
K 21.00
C -252.15
F -421.87
R 37.80
</pre>

=={{header|Groovy}}==
<lang Groovy>
class Convert{
static void main(String[] args){
def c=21.0;
println("K "+c)
println("C "+k_to_c(c));
println("F "+k_to_f(k_to_c(c)));
println("R "+k_to_r(c));
}
static def k_to_c(def k=21.0){return k-273.15;}
static def k_to_f(def k=21.0){return ((k*9)/5)+32;}
static def k_to_r(def k=21.0){return k*1.8;}
}
</lang>
{{out}}
<pre>
K 21.0
C -252.15
F -421.87
R 37.80
</pre>

=={{header|Haskell}}==

<lang haskell>import System.Exit (die)
import Control.Monad (mapM_)

main = do
putStrLn "Please enter temperature in kelvin: "
input <- getLine
let kelvin = read input
if kelvin < 0.0
then die "Temp cannot be negative"
else mapM_ putStrLn $ convert kelvin

convert :: Double -> [String]
convert n = zipWith (++) labels nums
where labels = ["kelvin: ", "celcius: ", "farenheit: ", "rankine: "]
conversions = [id, subtract 273, subtract 459.67 . (1.8 *), (*1.8)]
nums = (show . ($n)) <$> conversions</lang>

Or with properly managed exceptions:

<lang haskell>{-# LANGUAGE LambdaCase #-}

import System.Exit (die)
import Control.Monad (mapM_)
import Control.Error.Safe (tryAssert, tryRead)
import Control.Monad.Trans (liftIO)
import Control.Monad.Trans.Except

main = putStrLn "Please enter temperature in kelvin: " >>
runExceptT getTemp >>=
\case Right x -> mapM_ putStrLn $ convert x
Left err -> die err

convert :: Double -> [String]
convert n = zipWith (++) labels nums
where labels = ["kelvin: ", "celcius: ", "farenheit: ", "rankine: "]
conversions = [id, subtract 273, subtract 459.67 . (1.8 *), (1.8 *)]
nums = (show . ($ n)) <$> conversions
getTemp :: ExceptT String IO Double
getTemp = do
t <- liftIO getLine >>= tryRead "Could not read temp"
tryAssert "Temp cannot be negative" (t>=0)
return t</lang>

=={{header|Icon}} and {{header|Unicon}}==

The following program works in both languages:
<lang unicon>procedure main(A)
k := A[1] | 21.00
write("K ",k)
write("C ",k-273.15)
write("R ",r := k*(9.0/5.0))
write("F ",r - 459.67)
end</lang>

Sample runs:

<pre>
->tc
K 21.0
C -252.15
R 37.8
F -421.87
->tc 273.15
K 273.15
C 0.0
R 491.67
F 32.0
->
</pre>

=={{header|J}}==
'''Solution''':<lang j> NB. Temp conversions are all linear polynomials
K2K =: 0 1 NB. K = (1 *k) + 0
K2C =: _273 1 NB. C = (1 *k) - 273
K2F =: _459.67 1.8 NB. F = (1.8*k) - 459.67
K2R =: 0 1.8 NB. R = (1.8*k) + 0

NB. Do all conversions at once (eval
NB. polynomials in parallel). This is the
NB. numeric matrix J programs would manipulate
NB. directly.
k2KCFR =: (K2K , K2C , K2F ,: K2R) p./ ]</lang>
{{out|Example}}
<lang j> NB. Format matrix for printing & tag each
NB. temp with scale, for human legibility
fmt =: [: (;:inv"1) 0 _1 |: 'KCFR' ;"0 1"_1 '0.2' 8!:0 ]
kcfr =: fmt@k2KCFR
kcfr 21
K 21.00
C -252.00
F -421.87
R 37.80

kcfr 0 NB. Absolute zero
K 0.00
C -273.00
F -459.67
R 0.00

kcfr 21 100 300 NB. List of temps works fine
K 21.00 100.00 300.00
C -252.00 -173.00 27.00
F -421.87 -279.67 80.33
R 37.80 180.00 540.00</lang>
'''Notes''': The approach is founded on polynomials, one for each conversion (e.g. <tt>Fahrenheit = 1.8*x - 459.67</tt> where <tt>x</tt> is measured in degrees Kelvin), and all polynomials are evaluated simultaneously using the built-in <code>p.</code>. Through some code decorations (specifically the <code>/</code> in <code>p./</code> the <code>"0 1"_1</code> and the <code>0 _1 |:</code>), we permit our function to convert arrays of temperatures of arbitrarily high dimension (a single temp, lists of temps, tables of temps, cubes of temps, etc).

=={{header|Java}}==
<lang java>public class TemperatureConversion {
public static void main(String args[]) {
if (args.length == 1) {
try {
double kelvin = Double.parseDouble(args[0]);
if (kelvin >= 0) {
System.out.printf("K %2.2f\n", kelvin);
System.out.printf("C %2.2f\n", kelvinToCelsius(kelvin));
System.out.printf("F %2.2f\n", kelvinToFahrenheit(kelvin));
System.out.printf("R %2.2f\n", kelvinToRankine(kelvin));
} else {
System.out.printf("%2.2f K is below absolute zero", kelvin);
}
} catch (NumberFormatException e) {
System.out.println(e);
}
}
}

public static double kelvinToCelsius(double k) {
return k - 273.15;
}

public static double kelvinToFahrenheit(double k) {
return k * 1.8 - 459.67;
}

public static double kelvinToRankine(double k) {
return k * 1.8;
}
}</lang>
{{out}}
<pre>
K 21.00

C -252.15

F -421.87

R 37.80
</pre>

=={{header|JavaScript}}==

===ES5===
<lang javascript>var k2c = k => k - 273.15
var k2r = k => k * 1.8
var k2f = k => k2r(k) - 459.67

Number.prototype.toMaxDecimal = function (d) {
return +this.toFixed(d) + ''
}

function kCnv(k) {
document.write( k,'K° = ', k2c(k).toMaxDecimal(2),'C° = ', k2r(k).toMaxDecimal(2),'R° = ', k2f(k).toMaxDecimal(2),'F°<br>' )
}
kCnv(21)
kCnv(295)</lang>
{{out}}
<pre>
21K° = -252.15C° = 37.8R° = -421.87F°
295K° = 21.85C° = 531R° = 71.33F°
</pre>

===ES6===

Deriving '''kelvinTranslations()''' from a more general '''heatBabel()''' function.

<lang javascript>(() => {
'use strict';

let kelvinTranslations = k => ['K', 'C', 'F', 'R']
.map(x => [x, heatBabel(k, 'K', x)]);

// heatBabel :: Num -> ScaleName -> ScaleName -> Num
let heatBabel = (n, strFromScale, strToScale) => {
let ratio = 9 / 5,
cels = 273.15,
fahr = 459.67,
id = x => x,
readK = {
k: id,
c: x => cels + x,
f: x => (fahr + x) * ratio,
r: x => x / ratio
},
writeK = {
k: id,
c: x => x - cels,
f: x => (x * ratio) - fahr,
r: x => ratio * x
};

return writeK[strToScale.charAt(0).toLowerCase()](
readK[strFromScale.charAt(0).toLowerCase()](n)
).toFixed(2);
};


// TEST
return kelvinTranslations(21)
.map(([s, n]) => s + (' ' + n)
.slice(-10))
.join('\n');

})();
</lang>

{{Out}}

<pre>K 21.00
C -252.15
F -421.87
R 37.80</pre>

=={{header|jq}}==
The hard part here is defining round/1 generically.<lang jq>
# round(keep) takes as input any jq (i.e. JSON) number and emits a string.
# "keep" is the desired maximum number of numerals after the decimal point,
# e.g. 9.999|round(2) => 10.00
def round(keep):
tostring
| (index("e") | if . then . else index("E") end) as $e
| if $e then (.[0:$e] | round(keep)) + .[$e+1:]
else index(".") as $ix
| if $ix == null then .
else .[0:$ix + 1] as $head
| .[$ix+1:$ix+keep+2] as $tail
| if ($tail|length) <= keep then $head + $tail
else ($tail | .[length-1:] | tonumber) as $last
| if $last < 5 then $head + $tail[0:$tail|length - 1]
else (($head + $tail) | length) as $length
| ($head[0:-1] + $tail)
| (tonumber + (if $head[0:1]=="-" then -5 else 5 end))
| tostring
| .[0: ($ix+1+length-$length)] + "." + .[length-keep-1:-1]
end
end
end
end;

def k2c: . - 273.15;
def k2f: . * 1.8 - 459.67;
def k2r: . * 1.8;

# produce a stream
def cfr:
if . >= 0
then "Kelvin: \(.)", "Celsius: \(k2c|round(2))",
"Fahrenheit: \(k2f|round(2))", "Rankine: \(k2r|round(2))"
else error("cfr: \(.) is an invalid temperature in degrees Kelvin")
end;

cfr</lang>
'''Example'''
<lang sh> $ jq -M -r -f Temperature_conversion.jq
21
Kelvin: 21
Celsius: -252.15
Fahrenheit: -421.87
Rankine: 37.80
-1
jq: error: cfr: -1 is an invalid temperature in degrees Kelvin</lang>

=={{header|Julia}}==
<lang julia>cfr(k) = print("Kelvin: $k, ",
"Celsius: $(round(k-273.15,2)), ",
"Fahrenheit: $(round(k*1.8-459.67,2)), ",
"Rankine: $(round(k*1.8,2))")</lang>
<pre>julia> cfr(21)
Kelvin: 21, Celsius: -252.15, Fahrenheit: -421.87, Rankine: 37.8</pre>

=={{header|Kotlin}}==
<lang scala>// version 1.1.2

class Kelvin(val degrees: Double) {
fun toCelsius() = degrees - 273.15

fun toFahreneit() = (degrees - 273.15) * 1.8 + 32.0

fun toRankine() = (degrees - 273.15) * 1.8 + 32.0 + 459.67
}

fun main(args: Array<String>) {
print("Enter the temperature in degrees Kelvin : ")
val degrees = readLine()!!.toDouble()
val k = Kelvin(degrees)
val f = "% 1.2f"
println()
println("K ${f.format(k.degrees)}\n")
println("C ${f.format(k.toCelsius())}\n")
println("F ${f.format(k.toFahreneit())}\n")
println("R ${f.format(k.toRankine())}")
}</lang>

{{out}}
<pre>
Enter the temperature in degrees Kelvin : 21

K 21.00

C -252.15

F -421.87

R 37.80
</pre>

=={{header|Lambdatalk}}==
<lang scheme>
{def to-celsius {lambda {:k} {- :k 273.15}}}
-> to-celsius

{def to-farenheit {lambda {:k} {- {* :k 1.8} 459.67}}}
-> to-farenheit

{def to-rankine {lambda {:k} {* :k 1.8}}}
-> to-rankine

{def format {lambda {:n} {/ {round {* :n 100}} 100}}}
-> format

{def kelvinConversion
{lambda {:k}
kelvin is equivalent to:{br}
{format {to-celsius :k}} celsius{br}
{format {to-farenheit :k}} farenheit{br}
{format {to-rankine :k}} rankine}}
-> kelvinConversion

{kelvinConversion 21}
->
kelvin is equivalent to:
-252.15 celsius
-421.87 farenheit
37.8 rankine
</lang>

=={{header|Lasso}}==
<lang Lasso>define tempconverter(temp, kind) => {

local(
_temp = decimal(#temp),
convertratio = 1.8,
k_c = 273.15,
r_f = 459.67,
k,c,r,f
)

match(#kind) => {
case('k')
#k = #_temp
#c = -#k_c + #k
#r = #k * #convertratio
#f = -#r_f + #r
case('c')
#c = #_temp
#k = #k_c + #c
#r = #k * #convertratio
#f = -#r_f + #r
case('r')
#r = #_temp
#f = -#r_f + #r
#k = #r / #convertratio
#c = -#k_c + #k
case('f')
#f = #_temp
#r = #r_f + #f
#k = #r / #convertratio
#c = -#k_c + #k
case
return 'Something wrong'
}

return ('K = ' + #k -> asstring(-precision = 2) +
' C = ' + #c -> asstring(-precision = 2) +
' R = ' + #r -> asstring(-precision = 2) +
' F = ' + #f -> asstring(-precision = 2)
)
}

tempconverter(21, 'k')
'<br />'
tempconverter(21, 'c')
'<br />'
tempconverter(-41, 'c')
'<br />'
tempconverter(37.80, 'r')
'<br />'
tempconverter(69.80, 'f')</lang>
<pre>K = 21.00 C = -252.15 R = 37.80 F = -421.87
K = 294.15 C = 21.00 R = 529.47 F = 69.80
K = 232.15 C = -41.00 R = 417.87 F = -41.80
K = 21.00 C = -252.15 R = 37.80 F = -421.87
K = 294.15 C = 21.00 R = 529.47 F = 69.80</pre>

=={{header|LIL}}==
<lang tcl># Temperature conversion, in LIL
func kToc k {expr $k - 273.15}
func kTor k {expr $k / 5.0 * 9.0}
func kTof k {expr [kTor $k] - 469.67}

write "Enter kelvin temperatures or just enter to quit: "
for {set k [readline]} {![streq $k {}]} {set k [readline]} {
print "Kelvin: $k"
print "Celsius: [kToc $k]"
print "Fahrenheit: [kTof $k]"
print "Rankine: [kTor $k]"
}</lang>

{{out}}
<pre>prompt$ lil temperatureConversion.lil
Enter kelvin temperatures or just enter to quit: 21
Kelvin: 21
Celsius: -252.150000
Fahrenheit: -431.870000
Rankine: 37.800000</pre>

=={{header|LiveCode}}==
<lang LiveCode>function convertDegrees k
put k/5 * 9 into r
put k - 273.15 into c
put r - 459.67 into f
return k,r,c,f
end convertDegrees</lang>
Example<lang LiveCode>put convertDegrees(21.00) into tTemp
put item 1 of tTemp into temperature["Kelvin"]
put item 2 of tTemp into temperature["Rankine"]
put item 3 of tTemp into temperature["Celsius"]
put item 4 of tTemp into temperature["Fahrenheit"]
combine temperature using comma and colon
put temperature

-- Celsius:-252.15,Fahrenheit:-421.87,Kelvin:21.00,Rankine:37.8</lang>

=={{header|Lua}}==

<lang lua>function convert_temp(k)
local c = k - 273.15
local r = k * 1.8
local f = r - 459.67
return k, c, r, f
end

print(string.format([[
Kelvin: %.2f K
Celcius: %.2f °C
Rankine: %.2f °R
Fahrenheit: %.2f °F
]],convert_temp(21.0)))</lang>

=={{header|Maple}}==
<lang maple>tempConvert := proc(k)
seq(printf("%c: %.2f\n", StringTools[UpperCase](substring(i, 1)), convert(k, temperature, kelvin, i)), i in [kelvin, Celsius, Fahrenheit, Rankine]);
return NULL;
end proc:

tempConvert(21);</lang>
{{out}}
<pre>
K: 21.00
C: -252.15
F: -421.87
R: 37.80
</pre>

=={{header|Mathematica}}==
<lang Mathematica>tempConvert[t_] := # -> Thread@UnitConvert[#,
{"DegreesFahrenheit", "DegreesCelsius", "DegreesRankine"}
] &@Quantity[N@t, "Kelvins"]
tempConvert[21]</lang>
{{out}}<pre>21.K -> {-421.87°F,-252.15°C,37.8°R}</pre>

=={{header|min}}==
{{works with|min|0.19.3}}
<lang min>(
((float) (273.15 -) (9 5 / * 459.67 -) (9 5 / *)) cleave
() 'cons 4 times "K $1\nC $2\nF $3\nR $4" swap % puts!
) :convert

21 convert</lang>
{{out}}
<pre>
K 21.0
C -252.15
F -421.87
R 37.8
</pre>

=={{header|MiniScript}}==
<lang MiniScript>fromKelvin = function(temp)
print temp + " degrees in Kelvin is:"
Celsius = temp - 273.15
print Celsius + " degrees Celsius"
Fahrenheit = round(Celsius * 9/5 + 32,2)
print Fahrenheit + " degrees Fahrenheit"
Rankine = Fahrenheit + 459.67
print Rankine + " degrees Rankine"
end function

temp = input("Enter a temperature in Kelvin: ")
fromKelvin temp.val</lang>
{{out}}
<pre>
enter a temperature in Kelvin: 273.15
273.15 degrees in Kelvin is :-
0 degrees Celsius
32 degrees Fahrenheit
491.67 degrees Rankine

Enter a temperature in Kelvin: 300
300 degrees in Kelvin is:
26.85 degrees Celsius
80.33 degrees Fahrenheit
540 degrees Rankine
</pre>

=={{header|MiniZinc}}==
<lang MiniZinc>float: kelvin;

var float: celsius;
var float: fahrenheit;
var float: rankine;

constraint celsius == kelvin - 273.15;
constraint fahrenheit == celsius * 1.8 + 32;
constraint rankine == fahrenheit + 459.67;
solve satisfy;

output ["K \(kelvin)\n", "C \(celsius)\n", "F \(fahrenheit)\n", "R \(rankine)\n"];</lang>
{{out}}<pre>
Compiling temperature.mzn, additional arguments kelvin=1000;
Running temperature.mzn
K 1000.0
C 726.850000000001
F 1340.33
R 1800.0
----------
Finished in 62msec
</pre>

=={{header|МК-61/52}}==
<lang mk61>П7 0 , 8 * П8 ИП7 9 * 5
/ 3 2 + П9 ИП7 2 7 3 ,
1 5 + П4 С/П П8 1 , 8 /
БП 00 П9 3 2 - 5 * 9 /
БП 00 П4 2 7 3 , 1 5 -
БП 00</lang>

''Instruction:''

tºC = РX В/О С/П;

tºRa = РX БП 25 С/П;

tºF = РX БП 32 С/П;

tK = РX БП 42 С/П;

''Result:''

РX = Р4 = tK;

Р7 = tºC;

Р8 = tºRa;

Р9 = tºF.

=={{header|ML}}==
==={{header|mLite}}===
Temperature in Kelvin given on command line.
<lang ocaml>fun KtoC n = n - 273.15;
fun KtoF n = n * 1.8 - 459.67;
fun KtoR n = n * 1.8;
val K = argv 0;

if K = false then
println "mlite -f temcon.m <temp>"
else
let
val K = ston K
in
print "Kelvin: "; println K;
print "Celcius: "; println ` KtoC K;
print "Fahrenheit: "; println ` KtoF K;
print "Rankine: "; println ` KtoR K
end
</lang>

=={{header|Nanoquery}}==
{{trans|Python}}
<lang Nanoquery>% while true
... print "K ? "
... k = float(input())
...
... println format("%g Kelvin = %g Celsius = %g Fahrenheit = %g Rankine degrees.", k, k-273.15, k*1.8-459.67, k*1.8)
... end
K ? 21
21.0000 Kelvin = -252.150 Celsius = -421.870 Fahrenheit = 37.8000 Rankine degrees.
K ? 222.2
222.200 Kelvin = -50.9500 Celsius = -59.7100 Fahrenheit = 399.960 Rankine degrees.
K ? </lang>

=={{header|NetRexx}}==
<lang NetRexx>/* NetRexx */
options replace format comments java crossref symbols

numeric digits 20

runSample(arg)
return

-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/*
+ Kelvin Celsius Fahrenheit Rankine Delisle Newton Réaumur Rømer
K T T-273.15 T*9/5-459.67 T*9/5 (373.15-T)*3/2 (T-273.15)*33/100 (T-273.15)*4/5 (T-273.15)*21/40+7.5
C T+273.15 T T*9/5+32 (T+273.15)*9/5 (100-T)*3/2 T*33/100 T*4/5 T*21/40+7.5
F (T+459.67)*5/9 (T-32)*5/9 T T+459.67 (212-T)*5/6 (T-32)*11/60 (T-32)*4/9 (T-32)*7/24+7.5
R T*5/9 (T-491.67)*5/9 T-459.67 T (671.67-T)*5/6 (T-491.67)*11/60 (T-491.67)*4/9 (T-491.67)*7/24+7.5
De 373.15-T*2/3 100-T*2/3 212-T*6/5 671.67-T*6/5 T 33-T*11/50 80-T*8/15 60-T*7/20
N T*100/33+273.15 T*100/33 T*60/11+32 T*60/11+491.67 (33-T)*50/11 T T*80/33 T*35/22+7.5
Ré T*5/4+273.15 T*5/4 T*9/4+32 T*9/4+491.67 (80-T)*15/8 T*33/80 T T*21/32+7.5
Rø (T-7.5)*40/21+273.15 (T-7.5)*40/21 (T-7.5)*24/7+32 (T-7.5)*24/7+491.67 (60-T)*20/7 (T-7.5)*22/35 (T-7.5)*32/21 T
*/
method temperatureConversion(scaleFrom, scaleTo, T) public static

parse 'KELVIN CELSIUS FAHRENHEIT RANKINE DELISLE NEWTON REAUMUR ROEMER' -
KELVIN CELSIUS FAHRENHEIT RANKINE DELISLE NEWTON REAUMUR ROEMER .
scaleFrom = scaleFrom.upper()
scaleTo = scaleTo.upper()
select label sF case scaleFrom
when KELVIN then do
select case scaleTo
when KELVIN then val = T
when CELSIUS then val = T - 273.15
when FAHRENHEIT then val = T * 9 / 5 - 459.67
when RANKINE then val = T * 9 / 5
when DELISLE then val = (373.15 - T) * 3 / 2
when NEWTON then val = (T - 273.15) * 33 / 100
when REAUMUR then val = (T - 273.15) * 4 / 5
when ROEMER then val = (T - 273.15) * 21 / 40 + 7.5
otherwise signal IllegalArgumentException(scaleFrom',' scaleTo',' T)
end
end
when CELSIUS then do
select case scaleTo
when KELVIN then val = T + 273.15
when CELSIUS then val = T
when FAHRENHEIT then val = T * 9 / 5 + 32
when RANKINE then val = (T + 273.15) * 9 / 5
when DELISLE then val = (100 - T) * 3 / 2
when NEWTON then val = T * 33 / 100
when REAUMUR then val = T * 4 / 5
when ROEMER then val = T * 21 / 40 + 7.5
otherwise signal IllegalArgumentException(scaleFrom',' scaleTo',' T)
end
end
when FAHRENHEIT then do
select case scaleTo
when KELVIN then val = (T + 459.67) * 5 / 9
when CELSIUS then val = (T - 32) * 5 / 9
when FAHRENHEIT then val = T
when RANKINE then val = T + 459.67
when DELISLE then val = (212 - T) * 5 / 6
when NEWTON then val = (T - 32) * 11 / 60
when REAUMUR then val = (T - 32) * 4 / 9
when ROEMER then val = (T - 32) * 7 / 24 + 7.5
otherwise signal IllegalArgumentException(scaleFrom',' scaleTo',' T)
end
end
when RANKINE then do
select case scaleTo
when KELVIN then val = T * 5 / 9
when CELSIUS then val = (T - 491.67) * 5 / 9
when FAHRENHEIT then val = T - 459.67
when RANKINE then val = T
when DELISLE then val = (671.67 - T) * 5 / 6
when NEWTON then val = (T - 491.67) * 11 / 60
when REAUMUR then val = (T - 491.67) * 4 / 9
when ROEMER then val = (T - 491.67) * 7 / 24 + 7.5
otherwise signal IllegalArgumentException(scaleFrom',' scaleTo',' T)
end
end
when DELISLE then do
select case scaleTo
when KELVIN then val = 373.15 - T * 2 / 3
when CELSIUS then val = 100 - T * 2 / 3
when FAHRENHEIT then val = 212 - T * 6 / 5
when RANKINE then val = 671.67 - T * 6 / 5
when DELISLE then val = T
when NEWTON then val = 33 - T * 11 / 50
when REAUMUR then val = 80 - T * 8 / 15
when ROEMER then val = 60 - T * 7 / 20
otherwise signal IllegalArgumentException(scaleFrom',' scaleTo',' T)
end
end
when NEWTON then do
select case scaleTo
when KELVIN then val = T * 100 / 33 + 273.15
when CELSIUS then val = T * 100 / 33
when FAHRENHEIT then val = T * 60 / 11 + 32
when RANKINE then val = T * 60 / 11 + 491.67
when DELISLE then val = (33 - T) * 50 / 11
when NEWTON then val = T
when REAUMUR then val = T * 80 / 33
when ROEMER then val = T * 35 / 22 + 7.5
otherwise signal IllegalArgumentException(scaleFrom',' scaleTo',' T)
end
end
when REAUMUR then do
select case scaleTo
when KELVIN then val = T * 5 / 4 + 273.15
when CELSIUS then val = T * 5 / 4
when FAHRENHEIT then val = T * 9 / 4 + 32
when RANKINE then val = T * 9 / 4 + 491.67
when DELISLE then val = (80 - T) * 15 / 8
when NEWTON then val = T * 33 / 80
when REAUMUR then val = T
when ROEMER then val = T * 21 / 32 + 7.5
otherwise signal IllegalArgumentException(scaleFrom',' scaleTo',' T)
end
end
when ROEMER then do
select case scaleTo
when KELVIN then val = (T - 7.5) * 40 / 21 + 273.15
when CELSIUS then val = (T - 7.5) * 40 / 21
when FAHRENHEIT then val = (T - 7.5) * 24 / 7 + 32
when RANKINE then val = (T - 7.5) * 24 / 7 + 491.67
when DELISLE then val = (60 - T) * 20 / 7
when NEWTON then val = (T - 7.5) * 22 / 35
when REAUMUR then val = (T - 7.5) * 32 / 21
when ROEMER then val = T
otherwise signal IllegalArgumentException(scaleFrom',' scaleTo',' T)
end
end
otherwise
signal IllegalArgumentException(scaleFrom',' scaleTo',' T)
end sF

return val

-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
method runSample(arg) public static

tlist = [ -
/* C....... F....... K....... R.......*/ -
' 5500.00 9932.00 5773.15 10391.67', -
' 300.00 572.00 573.15 1031.67', -
' 200.00 392.00 473.15 851.67', -
' 100.00 212.00 373.15 671.67', -
' 37.00 98.60 310.15 558.27', -
' 0.00 32.00 273.15 491.67', -
' -100.00 -148.00 173.15 311.67', -
' -200.00 -328.00 73.15 131.67', -
' -252.15 -421.87 21.00 37.80', -
' -273.15 -459.67 0.00 0.00' -
]
]
]


print convertKelvins 100</lang>
parse 'CELSIUS FAHRENHEIT KELVIN RANKINE' CELSIUS FAHRENHEIT KELVIN RANKINE .
loop temp over tlist
parse temp ttC ttF ttK ttR .
say ' C....... F....... K....... R.......'
say 'C ' -
temperatureConversion(CELSIUS, CELSIUS, ttC).format(5, 2) -
temperatureConversion(CELSIUS, FAHRENHEIT, ttC).format(5, 2) -
temperatureConversion(CELSIUS, KELVIN, ttC).format(5, 2) -
temperatureConversion(CELSIUS, RANKINE, ttC).format(5, 2)
say 'F ' -
temperatureConversion(FAHRENHEIT, CELSIUS, ttF).format(5, 2) -
temperatureConversion(FAHRENHEIT, FAHRENHEIT, ttF).format(5, 2) -
temperatureConversion(FAHRENHEIT, KELVIN, ttF).format(5, 2) -
temperatureConversion(FAHRENHEIT, RANKINE, ttF).format(5, 2)
say 'K ' -
temperatureConversion(KELVIN, CELSIUS, ttK).format(5, 2) -
temperatureConversion(KELVIN, FAHRENHEIT, ttK).format(5, 2) -
temperatureConversion(KELVIN, KELVIN, ttK).format(5, 2) -
temperatureConversion(KELVIN, RANKINE, ttK).format(5, 2)
say 'R ' -
temperatureConversion(RANKINE, CELSIUS, ttR).format(5, 2) -
temperatureConversion(RANKINE, FAHRENHEIT, ttR).format(5, 2) -
temperatureConversion(RANKINE, KELVIN, ttR).format(5, 2) -
temperatureConversion(RANKINE, RANKINE, ttR).format(5, 2)
say
end temp


return
</lang>
{{out}}
{{out}}
<pre pre style="height: 40ex; overflow: scroll">
C....... F....... K....... R.......
C 5500.00 9932.00 5773.15 10391.67
F 5500.00 9932.00 5773.15 10391.67
K 5500.00 9932.00 5773.15 10391.67
R 5500.00 9932.00 5773.15 10391.67

C....... F....... K....... R.......
C 300.00 572.00 573.15 1031.67
F 300.00 572.00 573.15 1031.67
K 300.00 572.00 573.15 1031.67
R 300.00 572.00 573.15 1031.67

C....... F....... K....... R.......
C 200.00 392.00 473.15 851.67
F 200.00 392.00 473.15 851.67
K 200.00 392.00 473.15 851.67
R 200.00 392.00 473.15 851.67

C....... F....... K....... R.......
C 100.00 212.00 373.15 671.67
F 100.00 212.00 373.15 671.67
K 100.00 212.00 373.15 671.67
R 100.00 212.00 373.15 671.67

C....... F....... K....... R.......
C 37.00 98.60 310.15 558.27
F 37.00 98.60 310.15 558.27
K 37.00 98.60 310.15 558.27
R 37.00 98.60 310.15 558.27

C....... F....... K....... R.......
C 0.00 32.00 273.15 491.67
F 0.00 32.00 273.15 491.67
K 0.00 32.00 273.15 491.67
R 0.00 32.00 273.15 491.67

C....... F....... K....... R.......
C -100.00 -148.00 173.15 311.67
F -100.00 -148.00 173.15 311.67
K -100.00 -148.00 173.15 311.67
R -100.00 -148.00 173.15 311.67

C....... F....... K....... R.......
C -200.00 -328.00 73.15 131.67
F -200.00 -328.00 73.15 131.67
K -200.00 -328.00 73.15 131.67
R -200.00 -328.00 73.15 131.67

C....... F....... K....... R.......
C -252.15 -421.87 21.00 37.80
F -252.15 -421.87 21.00 37.80
K -252.15 -421.87 21.00 37.80
R -252.15 -421.87 21.00 37.80

C....... F....... K....... R.......
C -273.15 -459.67 0.00 0.00
F -273.15 -459.67 0.00 0.00
K -273.15 -459.67 0.00 0.00
R -273.15 -459.67 0.00 0.00
</pre>

=={{header|Never}}==
<lang Never>
func KtoC(k : float) -> float { k - 273.15 }
func KtoF(k : float) -> float { k * 1.8 - 459.67 }
func KtoR(k : float) -> float { k * 1.8 }

func convertK(k : float) -> int {
prints("K " + k + "\n");
prints("C " + KtoC(k) + "\n");
prints("F " + KtoF(k) + "\n");
prints("R " + KtoR(k) + "\n");
0
}

func main(k : float) -> int {
convertK(k);
0
}
</lang>
{{output}}
<pre>
K 21.00
C -252.15
F -421.87
R 37.80
</pre>

=={{header|NewLISP}}==
<lang NewLISP>
(define (to-celsius k)
(- k 273.15)
)

(define (to-fahrenheit k)
(- (* k 1.8) 459.67)
)

(define (to-rankine k)
(* k 1.8)
)

(define (kelvinConversion k)
(if (number? k)
(println k " kelvin is equivalent to:\n"
(to-celsius k) " celsius\n"
(to-fahrenheit k) " fahrenheit\n"
(to-rankine k) " rankine")
(println "Please enter a number only, with no º or letter. ")
)
)
</lang>
{{out}}
<pre>
21 kelvin is equivalent to:
-252 celsius
-438 fahrenheit
21 rankine
</pre>

=={{header|Nim}}==
<lang nim>import rdstdin, strutils, strfmt

while true:
let k = parseFloat readLineFromStdin "K ? "
echo "{:g} Kelvin = {:g} Celsius = {:g} Fahrenheit = {:g} Rankine degrees".fmt(
k, k - 273.15, k * 1.8 - 459.67, k * 1.8)</lang>
Sample usage:
<pre>K ? 21.0
21 Kelvin = -252.15 Celsius = -421.87 Fahrenheit = 37.8 Rankine degrees
K ? 222.2
222.2 Kelvin = -50.95 Celsius = -59.71 Fahrenheit = 399.96 Rankine degrees</pre>

=={{header|Objeck}}==
<lang objeck>
class Temperature {
function : Main(args : String[]) ~ Nil {
k := System.IO.Console->ReadString()->ToFloat();
c := KelvinToCelsius(k);
f := KelvinToFahrenheit(k);
r := KelvinToRankine(k);

"K: {$k}"->PrintLine();
"C: {$c}"->PrintLine();
"F: {$f}"->PrintLine();
"R: {$r}"->PrintLine();
}

function : KelvinToCelsius(k : Float) ~ Float {
return k - 273.15;
}
function : KelvinToFahrenheit(k : Float) ~ Float {
return k * 1.8 - 459.67;
}
function : KelvinToRankine(k : Float) ~ Float {
return k * 1.8;
}
}
</lang>

<pre>
K: 21.0
C: -252.150
F: -421.870
R: 37.800
</pre>

=={{header|Objective-C}}==
<lang objc>#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
@autoreleasepool {
if(argc > 1)
{
NSString *arg1 = [NSString stringWithCString:argv[1] encoding:NSUTF8StringEncoding];
// encoding shouldn't matter in this case
double kelvin = [arg1 doubleValue];
NSLog(@"K %.2f",kelvin);
NSLog(@"C %.2f\n", kelvin - 273.15);
NSLog(@"F %.2f\n", (kelvin * 1.8) - 459.67);
NSLog(@"R %.2f", kelvin * 1.8);
}
}
return 0;
}</lang>

=={{header|OCaml}}==
<lang ocaml>
let print_temp s t =
print_string s;
print_endline (string_of_float t);;

let kelvin_to_celsius k =
k -. 273.15;;

let kelvin_to_fahrenheit k =
(kelvin_to_celsius k)*. 9./.5. +. 32.00;;

let kelvin_to_rankine k =
(kelvin_to_celsius k)*. 9./.5. +. 491.67;;


print_endline "Enter a temperature in Kelvin please:";
let k = read_float () in
print_temp "K " k;
print_temp "C " (kelvin_to_celsius k);
print_temp "F " (kelvin_to_fahrenheit k);
print_temp "R " (kelvin_to_rankine k);;
</lang>

Sample session:
<pre>
Enter a temperature in Kelvin please:
184
K 184.
C -89.15
F -128.47
R 331.2
</pre>

=={{header|Oforth}}==

<lang Oforth>: kelvinToCelsius 273.15 - ;
: kelvinToFahrenheit 1.8 * 459.67 - ;
: kelvinToRankine 1.8 * ;

: testTemp(n)
n kelvinToCelsius println
n kelvinToFahrenheit println
n kelvinToRankine println ;</lang>

{{out}}
<pre>
>21 testTemp
-252.15
-421.87
37.8
</pre>

=={{header|PARI/GP}}==
<lang parigp>f(x)=[x,x-273.15,1.8*x-459.67,1.8*x]</lang>

=={{header|Pascal}}==
<lang Pascal>program TemperatureConvert;

type
TemperatureType = (C, F, K, R);

var
kelvin: real;

function ConvertTemperature(temperature: real; fromType, toType: TemperatureType): real;

var
initial, result: real;

begin
(* We are going to first convert whatever we're given into Celsius.
Then we'll convert that into whatever we're asked to convert into.
Maybe not the most efficient way to do this, but easy to understand
and should make it easier to add any additional temperature units. *)
if fromType <> toType then
begin
case fromType of (* first convert the temperature into Celsius *)
C:
initial := temperature;
F:
initial := (temperature - 32) / 1.8;
K:
initial := temperature - 273.15;
R:
initial := (temperature - 491.67) / 1.8;
end;
case toType of (* now convert from Celsius into whatever degree type was asked for *)
C:
result := initial;
F:
result := (initial * 1.8) + 32;
K:
result := initial + 273.15;
R:
result := (initial * 1.8) + 491.67;
end;
end
else (* no point doing all that math if we're asked to convert from and to the same type *)
result := temperature;
ConvertTemperature := result;
end;

begin
write('Temperature to convert (in kelvins): ');
readln(kelvin);
writeln(kelvin : 3 : 2, ' in kelvins is ');
writeln(' ', ConvertTemperature(kelvin, K, C) : 3 : 2, ' in degrees Celsius.');
writeln(' ', ConvertTemperature(kelvin, K, F) : 3 : 2, ' in degrees Fahrenheit.');
writeln(' ', ConvertTemperature(kelvin, K, R) : 3 : 2, ' in degrees Rankine.');
end.</lang>

{{out}}
<pre>
Temperature to convert (in kelvins): 373.15
373.15 in kelvins is
100.00 in degrees Celsius.
212.00 in degrees Fahrenheit.
671.67 in degrees Rankine.
</pre>

=={{header|Perl}}==
<lang Perl>my %scale = (
Celcius => { factor => 1 , offset => -273.15 },
Rankine => { factor => 1.8, offset => 0 },
Fahrenheit => { factor => 1.8, offset => -459.67 },
);

print "Enter a temperature in Kelvin: ";
chomp(my $kelvin = <STDIN>);
die "No such temperature!\n" unless $kelvin > 0;

foreach (sort keys %scale) {
printf "%12s:%8.2f\n", $_, $kelvin * $scale{$_}{factor} + $scale{$_}{offset};
}</lang>
{{out}}
<pre>
Enter a temperature in Kelvin: 21
Celcius: -252.15
Fahrenheit: -421.87
Rankine: 37.80
</pre>

=={{header|Phix}}==
Modified copy of [[Temperature_conversion#Euphoria|Euphoria]]
<lang Phix>atom K = prompt_number("Enter temperature in Kelvin >=0: ",{0,1e307})
printf(1," Kelvin: %5.2f\n Celsius: %5.2f\nFahrenheit: %5.2f\n Rankine: %5.2f\n\n",
{K, K-273.15, K*1.8-459.67, K*1.8})
</lang>
{{out}}
<pre>
Enter temperature in Kelvin >=0: 300
Kelvin: 300.00
Celsius: 26.85
Fahrenheit: 80.33
Rankine: 540.00
</pre>

=={{header|PHP}}==
<lang php>

while (true) {
echo "\nEnter a value in kelvin (q to quit): ";
if ($kelvin = trim(fgets(STDIN))) {
if ($kelvin == 'q') {
echo 'quitting';
break;
}
if (is_numeric($kelvin)) {
$kelvin = floatVal($kelvin);
if ($kelvin >= 0) {
printf(" K %2.2f\n", $kelvin);
printf(" C %2.2f\n", $kelvin - 273.15);
printf(" F %2.2f\n", $kelvin * 1.8 - 459.67);
printf(" R %2.2f\n", $kelvin * 1.8);
} else printf(" %2.2f K is below absolute zero\n", $kelvin);
}
}
}</lang>
{{out}}
<pre>Enter a value in kelvin (q to quit): 21
K 21.00
C -252.15
F -421.87
R 37.80

Enter a value in kelvin (q to quit): q
quitting</pre>

=={{header|PicoLisp}}==
<lang PicoLisp>(scl 2)

(de convertKelvin (Kelvin)
(for X
(quote
(K . prog)
(C (K) (- K 273.15))
(F (K) (- (*/ K 1.8 1.0) 459.67))
(R (K) (*/ K 1.8 1.0)) )
(tab (-3 8)
(car X)
(format ((cdr X) Kelvin) *Scl) ) ) )</lang>
Test:
<lang PicoLisp>(convertKelvin 21.0)</lang>
{{out}}
<pre>K 21.00
C -252.15
F -421.87
R 37.80</pre>

=={{header|PL/I}}==
<lang pli>*process source attributes xref;
/* PL/I **************************************************************
* 15.08.2013 Walter Pachl translated from NetRexx
* temperatures below 0K are considered invalid
*********************************************************************/
temperature: Proc Options(main);
Dcl sysin record Input;
On Endfile(sysin) Goto eoj;
On Record(sysin);
Dcl 1 dat,
2 t Pic'SSSS9V.99',
2 * char( 1),
2 from char(10),
2 * char( 1),
2 to char(10);
Do Forever;
Read File(sysin) Into(dat);
If tc(t,from,'KELVIN')<0 Then
Put Edit('Input (',t,from,') invalid. Below absolute zero')
(Skip,a,f(8,2),x(1),a,a);
Else
Put edit(t,from,' -> ',tc(t,from,to),to)
(skip,f(8,2),x(1),a(10),a,f(8,2),x(1),a(10));
End;
eoj: Return;

tc: Procedure(T,scaleFrom,scaleTo) Returns(Dec Fixed(8,2));
Dcl t Pic'SSSS9V.99';
Dcl (val) Dec Fixed(8,2);
Dcl (scaleFrom,scaleTo) Char(10);
select(scaleFrom);
when('KELVIN ') do;
select(scaleTo);
when('KELVIN ') val = T;
when('CELSIUS ') val = T - 273.15;
when('FAHRENHEIT') val = T * 9 / 5 - 459.67;
when('RANKINE ') val = T * 9 / 5;
when('DELISLE ') val = (373.15 - T) * 3 / 2;
when('NEWTON ') val = (T - 273.15) * 33 / 100;
when('REAUMUR ') val = (T - 273.15) * 4 / 5;
when('ROEMER ') val = (T - 273.15) * 21 / 40 + 7.5;
otherwise Do;
Put Edit('scaleTo=',scaleTo)(Skip,a,a);
Call err(1);
End;
end;
end;
when('CELSIUS') do;
select(scaleTo);
when('KELVIN ') val = T + 273.15;
when('CELSIUS ') val = T;
when('FAHRENHEIT') val = T * 9 / 5 + 32;
when('RANKINE ') val = (T + 273.15) * 9 / 5;
when('DELISLE ') val = (100 - T) * 3 / 2;
when('NEWTON ') val = T * 33 / 100;
when('REAUMUR ') val = T * 4 / 5;
when('ROEMER ') val = T * 21 / 40 + 7.5;
otherwise Call err(2);
end;
end;
when('FAHRENHEIT') do;
select(scaleTo);
when('KELVIN ') val = (T + 459.67) * 5 / 9;
when('CELSIUS ') val = (T - 32) * 5 / 9;
when('FAHRENHEIT') val = T;
when('RANKINE ') val = T + 459.67;
when('DELISLE ') val = (212 - T) * 5 / 6;
when('NEWTON ') val = (T - 32) * 11 / 60;
when('REAUMUR ') val = (T - 32) * 4 / 9;
when('ROEMER ') val = (T - 32) * 7 / 24 + 7.5;
otherwise Call err(3);
end;
end;
when('RANKINE') do;
select(scaleTo);
when('KELVIN ') val = T * 5 / 9;
when('CELSIUS ') val = (T - 491.67) * 5 / 9;
when('FAHRENHEIT') val = T - 459.67;
when('RANKINE ') val = T;
when('DELISLE ') val = (671.67 - T) * 5 / 6;
when('NEWTON ') val = (T - 491.67) * 11 / 60;
when('REAUMUR ') val = (T - 491.67) * 4 / 9;
when('ROEMER ') val = (T - 491.67) * 7 / 24 + 7.5;
otherwise Call err(4);
end;
end;
when('DELISLE') do;
select(scaleTo);
when('KELVIN ') val = 373.15 - T * 2 / 3;
when('CELSIUS ') val = 100 - T * 2 / 3;
when('FAHRENHEIT') val = 212 - T * 6 / 5;
when('RANKINE ') val = 671.67 - T * 6 / 5;
when('DELISLE ') val = T;
when('NEWTON ') val = 33 - T * 11 / 50;
when('REAUMUR ') val = 80 - T * 8 / 15;
when('ROEMER ') val = 60 - T * 7 / 20;
otherwise Call err(5);
end;
end;
when('NEWTON') do;
select(scaleTo);
when('KELVIN ') val = T * 100 / 33 + 273.15;
when('CELSIUS ') val = T * 100 / 33;
when('FAHRENHEIT') val = T * 60 / 11 + 32;
when('RANKINE ') val = T * 60 / 11 + 491.67;
when('DELISLE ') val = (33 - T) * 50 / 11;
when('NEWTON ') val = T;
when('REAUMUR ') val = T * 80 / 33;
when('ROEMER ') val = T * 35 / 22 + 7.5;
otherwise Call err(6);
end;
end;
when('REAUMUR') do;
select(scaleTo);
when('KELVIN ') val = T * 5 / 4 + 273.15;
when('CELSIUS ') val = T * 5 / 4;
when('FAHRENHEIT') val = T * 9 / 4 + 32;
when('RANKINE ') val = T * 9 / 4 + 491.67;
when('DELISLE ') val = (80 - T) * 15 / 8;
when('NEWTON ') val = T * 33 / 80;
when('REAUMUR ') val = T;
when('ROEMER ') val = T * 21 / 32 + 7.5;
otherwise Call err(7);
end;
end;
when('ROEMER') do;
select(scaleTo);
when('KELVIN ') val = (T - 7.5) * 40 / 21 + 273.15;
when('CELSIUS ') val = (T - 7.5) * 40 / 21;
when('FAHRENHEIT') val = (T - 7.5) * 24 / 7 + 32;
when('RANKINE ') val = (T - 7.5) * 24 / 7 + 491.67;
when('DELISLE ') val = (60 - T) * 20 / 7;
when('NEWTON ') val = (T - 7.5) * 22 / 35;
when('REAUMUR ') val = (T - 7.5) * 32 / 21;
when('ROEMER ') val = T;
otherwise Call err(8);
end;
end;
otherwise Call err(9);
end;
return(val);
err: Proc(e);
Dcl e Dec fixed(1);
Put Edit('error ',e,' invalid input')(Skip,a,f(1),a);
val=0;
End;
End;
End;</lang>
{{out}}
<pre>
21.00 KELVIN -> -252.15 CELSIUS
21.00 KELVIN -> -421.87 FAHRENHEIT
21.00 KELVIN -> 37.80 RANKINE
Input ( 600.00 DELISLE ) invalid. Below absolute zero
Input ( -1.00 KELVIN ) invalid. Below absolute zero
Input ( -300.00 CELSIUS ) invalid. Below absolute zero
212.00 FAHRENHEIT -> 100.00 CELSIUS
0.00 FAHRENHEIT -> -17.77 CELSIUS
0.00 CELSIUS -> 32.00 FAHRENHEIT
37.00 CELSIUS -> 98.60 FAHRENHEIT
</pre>

=={{header|Plain English}}==
<lang plainenglish>To run:
Start up.
Put 21 into a kelvin temperature.
Show the kelvin temperature in various temperature scales.
Wait for the escape key.
Shut down.

A temperature is a fraction.
A kelvin temperature is a temperature.
A celsius temperature is a temperature.
A rankine temperature is a temperature.
A fahrenheit temperature is a temperature.

To convert a kelvin temperature to a celsius temperature:
Put the kelvin temperature minus 273-15/100 into the celsius temperature.

To convert a kelvin temperature to a rankine temperature:
Put the kelvin temperature times 9/5 into the rankine temperature.

To convert a kelvin temperature to a fahrenheit temperature:
Convert the kelvin temperature to a rankine temperature.
Put the rankine temperature minus 459-67/100 into the fahrenheit temperature.

To show a temperature given a temperature scale string:
Write the temperature scale then " = " then the temperature then " degrees" on the console.

To show a kelvin temperature in various temperature scales:
Convert the kelvin temperature to a celsius temperature.
Convert the kelvin temperature to a fahrenheit temperature.
Convert the kelvin temperature to a rankine temperature.
Show the kelvin temperature given "K".
Show the celsius temperature given "C".
Show the fahrenheit temperature given "F".
Show the rankine temperature given "R".</lang>
{{out}}
<pre>
K = 21 degrees
C = -252-3/20 degrees
F = -421-87/100 degrees
R = 37-4/5 degrees
</pre>

=={{header|PowerShell}}==
{{trans|Tcl}}
<lang powershell>function temp($k){
try{
$c = $k - 273.15
$r = $k / 5 * 9
$f = $r - 459.67
} catch {
Write-host "Input error."
return
}

Write-host ""
Write-host " TEMP (Kelvin) : " $k
Write-host " TEMP (Celsius) : " $c
Write-host " TEMP (Fahrenheit): " $f
Write-host " TEMP (Rankine) : " $r
Write-host ""

}

$input=Read-host "Enter a temperature in Kelvin"
temp $input</lang>
{{Out}}
<pre>PS> ./TEMPS
Enter a temperature in Kelvin: 100

TEMP (Kelvin) : 100
TEMP (Celsius) : -173.15
TEMP (Fahrenheit): -279.67
TEMP (Rankine) : 180

PS></pre>

===PowerShell Alternate Version===
A more "PowerShelly" way to do it.
<lang PowerShell>
function Convert-Kelvin
{
[CmdletBinding()]
[OutputType([PSCustomObject])]
Param
(
[Parameter(Mandatory=$true,
ValueFromPipeline=$true,
ValueFromPipelineByPropertyName=$true,
Position=0)]
[double]
$InputObject
)

Process
{
foreach ($kelvin in $InputObject)
{
[PSCustomObject]@{
Kelvin = $kelvin
Celsius = $kelvin - 273.15
Fahrenheit = $kelvin * 1.8 - 459.67
Rankine = $kelvin * 1.8
}
}
}
}
</lang>
<lang PowerShell>
21, 100 | Convert-Kelvin
</lang>
{{Out}}
<pre>
Kelvin Celsius Fahrenheit Rankine
------ ------- ---------- -------
21 -252.15 -421.87 37.8
100 -173.15 -279.67 180
</pre>

=={{header|Pure Data}}==

'''temperature.pd'''
<pre>
#N canvas 200 200 640 600 10;
#X floatatom 130 54 8 0 0 2 Kelvin chgk -;
#X obj 130 453 rnd2;
#X floatatom 130 493 8 0 0 1 K - -;
#X floatatom 251 54 8 0 0 2 Celsius chgc -;
#X obj 251 453 rnd2;
#X floatatom 251 493 8 0 0 1 °C - -;
#X floatatom 374 54 8 0 0 2 Fahrenheit chgf -;
#X obj 374 453 rnd2;
#X floatatom 374 493 8 0 0 1 °F - -;
#X floatatom 498 54 8 0 0 2 Rankine chgr -;
#X obj 498 453 rnd2;
#X floatatom 498 493 8 0 0 1 °Ra - -;
#X obj 65 133 - 273.15;
#X obj 65 244 * 1.8;
#X obj 65 267 + 32;
#X obj 65 363 + 459.67;
#X obj 186 133 * 1.8;
#X obj 186 156 + 32;
#X obj 186 268 + 459.67;
#X obj 186 310 / 1.8;
#X obj 309 133 + 459.67;
#X obj 309 215 / 1.8;
#X obj 309 291 - 273.15;
#X obj 433 133 / 1.8;
#X obj 433 223 - 273.15;
#X obj 433 294 * 1.8;
#X obj 433 317 + 32;
#X text 20 53 Input:;
#X text 20 492 Output:;
#X connect 0 0 1 0;
#X connect 0 0 12 0;
#X connect 1 0 2 0;
#X connect 3 0 4 0;
#X connect 3 0 16 0;
#X connect 4 0 5 0;
#X connect 6 0 7 0;
#X connect 6 0 20 0;
#X connect 7 0 8 0;
#X connect 9 0 10 0;
#X connect 9 0 23 0;
#X connect 10 0 11 0;
#X connect 12 0 13 0;
#X connect 12 0 4 0;
#X connect 13 0 14 0;
#X connect 14 0 15 0;
#X connect 14 0 7 0;
#X connect 15 0 10 0;
#X connect 16 0 17 0;
#X connect 17 0 18 0;
#X connect 17 0 7 0;
#X connect 18 0 19 0;
#X connect 18 0 10 0;
#X connect 19 0 1 0;
#X connect 20 0 21 0;
#X connect 20 0 10 0;
#X connect 21 0 22 0;
#X connect 21 0 1 0;
#X connect 22 0 4 0;
#X connect 23 0 24 0;
#X connect 23 0 1 0;
#X connect 24 0 25 0;
#X connect 24 0 4 0;
#X connect 25 0 26 0;
#X connect 26 0 7 0;
</pre>
Plugin to round the results to at most 2 digits:

'''rnd.pd'''
<pre>
#N canvas 880 200 450 300 10;
#X obj 77 34 inlet;
#X obj 77 113 * 100;
#X obj 77 135 + 0.5;
#X obj 132 135 < 0;
#X obj 77 172 -;
#X obj 77 194 int;
#X obj 77 216 / 100;
#X obj 77 238 outlet;
#X connect 0 0 1 0;
#X connect 0 0 3 0;
#X connect 1 0 2 0;
#X connect 2 0 4 0;
#X connect 3 0 4 1;
#X connect 4 0 5 0;
#X connect 5 0 6 0;
#X connect 6 0 7 0;
</pre>

=={{header|PureBasic}}==
<lang purebasic>Procedure.d Kelvin2Celsius(tK.d) : ProcedureReturn tK-273.15 : EndProcedure
Procedure.d Kelvin2Fahrenheit(tK.d) : ProcedureReturn tK*1.8-459.67 : EndProcedure
Procedure.d Kelvin2Rankine(tK.d) : ProcedureReturn tK*1.8 : EndProcedure

OpenConsole()
Repeat
Print("Temperatur Kelvin? ") : Kelvin.d = ValD(Input())
PrintN("Conversion:")
PrintN(#TAB$+"Celsius "+#TAB$+RSet(StrD(Kelvin2Celsius(Kelvin),2),8,Chr(32)))
PrintN(#TAB$+"Fahrenheit"+#TAB$+RSet(StrD(Kelvin2Fahrenheit(Kelvin),2),8,Chr(32)))
PrintN(#TAB$+"Rankine "+#TAB$+RSet(StrD(Kelvin2Rankine(Kelvin),2),8,Chr(32)))
PrintN("ESC = End.")
Repeat
k$=Inkey() : Delay(50) : If RawKey()=#ESC : End : EndIf
Until RawKey()
ForEver</lang>
<pre>Temperatur Kelvin? 21
Conversion:
Celsius -252.15
Fahrenheit -421.87
Rankine 37.80
ESC = End.</pre>

=={{header|Python}}==
<lang python>>>> while True:
k = float(input('K ? '))
print("%g Kelvin = %g Celsius = %g Fahrenheit = %g Rankine degrees."
% (k, k - 273.15, k * 1.8 - 459.67, k * 1.8))

K ? 21.0
21 Kelvin = -252.15 Celsius = -421.87 Fahrenheit = 37.8 Rankine degrees.
K ? 222.2
222.2 Kelvin = -50.95 Celsius = -59.71 Fahrenheit = 399.96 Rankine degrees.
K ? </lang>

===Python: Universal conversion===
This converts from any one of the units to all the others
<lang python>>>> toK = {'C': (lambda c: c + 273.15),
'F': (lambda f: (f + 459.67) / 1.8),
'R': (lambda r: r / 1.8),
'K': (lambda k: k) }
>>> while True:
magnitude, unit = input('<value> <K/R/F/C> ? ').split()
k = toK[unit](float(magnitude))
print("%g Kelvin = %g Celsius = %g Fahrenheit = %g Rankine degrees."
% (k, k - 273.15, k * 1.8 - 459.67, k * 1.8))

<value> <K/R/F/C> ? 222.2 K
222.2 Kelvin = -50.95 Celsius = -59.71 Fahrenheit = 399.96 Rankine degrees.
<value> <K/R/F/C> ? -50.95 C
222.2 Kelvin = -50.95 Celsius = -59.71 Fahrenheit = 399.96 Rankine degrees.
<value> <K/R/F/C> ? -59.71 F
222.2 Kelvin = -50.95 Celsius = -59.71 Fahrenheit = 399.96 Rankine degrees.
<value> <K/R/F/C> ? 399.96 R
222.2 Kelvin = -50.95 Celsius = -59.71 Fahrenheit = 399.96 Rankine degrees.
<value> <K/R/F/C> ? </lang>

=={{header|Quackery}}==

All the conversions.

Using the Quackery big number rational arithmetic library <code>bigrat.qky</code>.

<lang Quackery> [ $ "bigrat.qky" loadfile ] now!
[ 5 9 v* ] is r->k ( n/d --> n/d )
[ 1/v r->k 1/v ] is k->r ( n/d --> n/d )
[ 45967 100 v- ] is r->f ( n/d --> n/d )
[ -v r->f -v ] is f->r ( n/d --> n/d )
[ 5463 20 v- ] is k->c ( n/d --> n/d )
[ -v k->c -v ] is c->k ( n/d --> n/d )
[ k->r r->f ] is k->f ( n/d --> n/d )
[ f->r r->k ] is f->k ( n/d --> n/d )
[ r->k k->c ] is r->c ( n/d --> n/d )
[ c->k k->r ] is c->r ( n/d --> n/d )
[ f->k k->c ] is f->c ( n/d --> n/d )
[ c->r r->f ] is c->f ( n/d --> n/d )
[ $->v drop
2dup 10 point$ echo$
say " Kelvins is equal to" cr
k->c 2dup 10 point$ echo$
say " degrees Celcius" cr
c->f 2dup 10 point$ echo$
say " degrees Fahrenheit" cr
f->r 10 point$ echo$
say " degrees Rankine" cr ] is task ( $ --> )
$ "21.00" task</lang>

{{out}}

<pre>21 Kelvins is equal to
-252.15 degrees Celcius
-421.87 degrees Fahrenheit
37.8 degrees Rankine</pre>

=={{header|Racket}}==
Although not exactly the shortest code,
the converter function can turn any temperature into any other
<lang Racket>#lang racket
(define (converter temp init final)
(define to-k
(case init
('k temp)
('c (+ 273.15 temp))
('f (* (+ temp 459.67) 5/9))
('r (* temp 5/9))))
(case final
('k to-k)
('c (- to-k 273.15))
('f (- (* to-k 9/5) 459.67))
('r (* to-k 1.8))))

(define (kelvin-to-all temp)
(display (format "Kelvin: ~a \nCelsius: ~a \nFahrenheit: ~a \nRankine: ~a \n"
temp
(converter temp 'k 'c)
(converter temp 'k 'f)
(converter temp 'k 'r))))
(kelvin-to-all 21)
;Kelvin: 21
;Celsius: -252.14999999999998
;Fahrenheit: -421.87
;Rankine: 37.800000000000004
</lang>

=={{header|Raku}}==
(formerly Perl 6)

{{trans|Perl}}
<lang perl6>my %scale =
Celcius => { factor => 1 , offset => -273.15 },
Rankine => { factor => 1.8, offset => 0 },
Fahrenheit => { factor => 1.8, offset => -459.67 },
;
my $kelvin = +prompt "Enter a temperature in Kelvin: ";
die "No such temperature!" if $kelvin < 0;
for %scale.sort {
printf "%12s: %7.2f\n", .key, $kelvin * .value<factor> + .value<offset>;
}</lang>

{{out}}
<pre>
Enter a temperature in Kelvin: 21
Celcius: -252.15
Fahrenheit: -421.87
Rankine: 37.80
</pre>

Alternative version that accepts the input in any of the four scales:

<lang perl6>while my $answer = prompt 'Temperature: ' {
my $k = do given $answer {
when s/:i C $// { $_ + 273.15 }
when s/:i F $// { ($_ + 459.67) / 1.8 }
when s/:i R $// { $_ / 1.8 }
when s/:i K $// { $_ }
default { $_ }
}
say " { $k }K";
say " { $k - 273.15 }℃";
say " { $k * 1.8 - 459.67 }℉";
say " { $k * 1.8 }R";
}</lang>
{{out}}
<pre>Temperature: 0
0K
-273.15℃
-459.67℉
0R
Temperature: 0c
273.15K
0℃
32℉
491.67R
Temperature: 212f
373.15K
100℃
212℉
671.67R
Temperature: -40c
233.15K
-40℃
-40℉
419.67R</pre>

=={{header|REXX}}==
===abridged===
This REXX version supports:
::* (alternate spellings with optional &nbsp; ''degree'' &nbsp; or &nbsp; ''degrees'' &nbsp; preceding the scale name):
::* alternate temperature scale names
::* supports &nbsp; ''any to all'' &nbsp; conversions
::* supports &nbsp; ''any to any'' &nbsp; conversion &nbsp; (with the &nbsp; '''TO''' &nbsp; option)
::* support of some common misspellings &nbsp; (''it knows what you mean'')
::* support of some common temperature scales:
::::::* Celsius, &nbsp; centigrade
::::::* Delisle
::::::* Fahrenheit
::::::* kelvin
::::::* Newton
::::::* Rankine
::::::* Reaumur, &nbsp; Réaumur
::::::* Romer, &nbsp; Rømer, &nbsp; Roemer
::* multiple temperatures in a list
::* specification of which temperature scale to be used for conversion
::* conversion of a temperature to:
::::::* all other temperature scales
::::::* a specific temperature scale
::* supports proper pluralization of kelvin
::* comments (annotation notes) allowed within the list
::* aligned output (whole numbers and decimal fractions)
<lang rexx>/*REXX program converts temperatures for a number (8) of temperature scales. */
numeric digits 120 /*be able to support some huge numbers.*/
parse arg tList /*get the specified temperature list. */

do until tList='' /*process the list of temperatures. */
parse var tList x ',' tList /*temps are separated by commas. */
x=translate(x,'((',"[{") /*support other grouping symbols. */
x=space(x); parse var x z '(' /*handle any comments (if any). */
parse upper var z z ' TO ' ! . /*separate the TO option from number.*/
if !=='' then !='ALL'; all=!=='ALL' /*allow specification of "TO" opt*/
if z=='' then call serr "no arguments were specified." /*oops-ay. */
_=verify(z, '+-.0123456789') /*list of valid numeral/number thingys.*/
n=z
if _\==0 then do
if _==1 then call serr 'illegal temperature:' z
n=left(z, _-1) /*pick off the number (hopefully). */
u=strip(substr(z, _)) /*pick off the temperature unit. */
end
else u='k' /*assume kelvin as per task requirement*/

if \datatype(n, 'N') then call serr 'illegal number:' n
if \all then do /*is there is a TO ααα scale? */
call name ! /*process the TO abbreviation. */
!=sn /*assign the full name to ! */
end /*!: now contains temperature full name*/
call name u /*allow alternate scale (miss)spellings*/

select /*convert ──► °Fahrenheit temperatures.*/
when sn=='CELSIUS' then F=n * 9/5 + 32
when sn=='DELISLE' then F=212 -(n * 6/5)
when sn=='FAHRENHEIT' then F=n
when sn=='KELVIN' then F=n * 9/5 - 459.67
when sn=='NEWTON' then F=n * 60/11 + 32
when sn=='RANKINE' then F=n - 459.67 /*a single R is taken as Rankine.*/
when sn=='REAUMUR' then F=n * 9/4 + 32
when sn=='ROMER' then F=(n-7.5) * 27/4 + 32
otherwise call serr 'illegal temperature scale: ' u
end /*select*/

K = (F + 459.67) * 5/9 /*compute temperature to kelvins. */
say right(' ' x, 79, "─") /*show the original value, scale, sep. */
if all | !=='CELSIUS' then say $( ( F - 32 ) * 5/9 ) 'Celsius'
if all | !=='DELISLE' then say $( ( 212 - F ) * 5/6 ) 'Delisle'
if all | !=='FAHRENHEIT' then say $( F ) 'Fahrenheit'
if all | !=='KELVIN' then say $( K ) 'kelvin's(K)
if all | !=='NEWTON' then say $( ( F - 32 ) * 11/60 ) 'Newton'
if all | !=='RANKINE' then say $( F + 459.67 ) 'Rankine'
if all | !=='REAUMUR' then say $( ( F - 32 ) * 4/9 ) 'Reaumur'
if all | !=='ROMER' then say $( ( F - 32 ) * 4/27 + 7.5 ) 'Romer'
end /*until*/

exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
s: if arg(1)==1 then return arg(3); return word(arg(2) 's',1)
serr: say; say '***error!***'; say; say arg(1); say; exit 13
/*──────────────────────────────────────────────────────────────────────────────────────*/
$: procedure; showDig=8 /*only show eight significant digits.*/
_=format(arg(1), , showDig) / 1 /*format number 8 digs past dec, point.*/
p=pos(., _); L=length(_) /*find position of the decimal point. */
/* [↓] align integers with FP numbers.*/
if p==0 then _=_ || left('',5+showDig+1) /*the number has no decimal point. */
else _=_ || left('',5+showDig-L+p) /* " " " a " " */
return right(_, 50) /*return the re-formatted number (arg).*/
/*──────────────────────────────────────────────────────────────────────────────────────*/
name: parse arg y /*abbreviations ──► shortname.*/
yU=translate(y, 'eE', "éÉ"); upper yU /*uppercase the temperature unit*/
if left(yU, 7)=='DEGREES' then yU=substr(yU, 8) /*redundant "degrees" after #? */
if left(yU, 6)=='DEGREE' then yU=substr(yU, 7) /* " "degree" " " */
yU=strip(yU) /*elide blanks at front and back*/
_=length(yU) /*obtain the yU length. */
if right(yU, 1)=='S' & _>1 then yU=left(yU, _ -1) /*elide trailing plural, if any.*/
select /*abbreviations ──► shortname.*/
when abbrev('CENTIGRADE' , yU) |,
abbrev('CENTRIGRADE', yU) |, /* 50% misspelled.*/
abbrev('CETIGRADE' , yU) |, /* 50% misspelled.*/
abbrev('CENTINGRADE', yU) |,
abbrev('CENTESIMAL' , yU) |,
abbrev('CELCIU' , yU) |, /* 82% misspelled.*/
abbrev('CELCIOU' , yU) |, /* 4% misspelled.*/
abbrev('CELCUI' , yU) |, /* 4% misspelled.*/
abbrev('CELSUI' , yU) |, /* 2% misspelled.*/
abbrev('CELCEU' , yU) |, /* 2% misspelled.*/
abbrev('CELCU' , yU) |, /* 2% misspelled.*/
abbrev('CELISU' , yU) |, /* 1% misspelled.*/
abbrev('CELSU' , yU) |, /* 1% misspelled.*/
abbrev('CELSIU' , yU) then sn='CELSIUS'
when abbrev('DELISLE' , yU,2) then sn='DELISLE'
when abbrev('FARENHEIT' , yU) |, /* 39% misspelled.*/
abbrev('FARENHEIGHT', yU) |, /* 15% misspelled.*/
abbrev('FARENHITE' , yU) |, /* 6% misspelled.*/
abbrev('FARENHIET' , yU) |, /* 3% misspelled.*/
abbrev('FARHENHEIT' , yU) |, /* 3% misspelled.*/
abbrev('FARINHEIGHT', yU) |, /* 2% misspelled.*/
abbrev('FARENHIGHT' , yU) |, /* 2% misspelled.*/
abbrev('FAHRENHIET' , yU) |, /* 2% misspelled.*/
abbrev('FERENHEIGHT', yU) |, /* 2% misspelled.*/
abbrev('FEHRENHEIT' , yU) |, /* 2% misspelled.*/
abbrev('FERENHEIT' , yU) |, /* 2% misspelled.*/
abbrev('FERINHEIGHT', yU) |, /* 1% misspelled.*/
abbrev('FARIENHEIT' , yU) |, /* 1% misspelled.*/
abbrev('FARINHEIT' , yU) |, /* 1% misspelled.*/
abbrev('FARANHITE' , yU) |, /* 1% misspelled.*/
abbrev('FAHRENHEIT' , yU) then sn='FAHRENHEIT'
when abbrev('KALVIN' , yU) |, /* 27% misspelled.*/
abbrev('KERLIN' , yU) |, /* 18% misspelled.*/
abbrev('KEVEN' , yU) |, /* 9% misspelled.*/
abbrev('KELVIN' , yU) then sn='KELVIN'
when abbrev('NEUTON' , yU) |, /*100% misspelled.*/
abbrev('NEWTON' , yU) then sn='NEWTON'
when abbrev('RANKINE' , yU, 1) then sn='RANKINE'
when abbrev('REAUMUR' , yU, 2) then sn='REAUMUR'
when abbrev('ROEMER' , yU, 2) |,
abbrev('ROMER' , yU, 2) then sn='ROMER'
otherwise call serr 'illegal temperature scale:' y
end /*select*/
return</lang>
'''output''' &nbsp; when using the input of: &nbsp; &nbsp; <tt> 98.6F to C, &nbsp; -40C, 0 c (water freezes), &nbsp; 37C (body temp), &nbsp; 100 C (water boils), &nbsp; 21 degrees Kelvin, &nbsp; 0 K (outer space?) </tt>
<pre>
─────────────────────────────────────────────────────────────────── 98.6F to C
37 Celsius
───────────────────────────────────────────────────────────────────────── -40C
-40 Celsius
210 Delisle
-40 Fahrenheit
233.15 kelvins
-13.2 Newton
419.67 Rankine
-32 Reaumur
-3.16666667 Romer
────────────────────────────────────────────────────────── 0 c (water freezes)
0 Celsius
150 Delisle
32 Fahrenheit
273.15 kelvins
0 Newton
491.67 Rankine
0 Reaumur
7.5 Romer
────────────────────────────────────────────────────────────── 37C (body temp)
37 Celsius
94.5 Delisle
98.6 Fahrenheit
310.15 kelvins
12.21 Newton
558.27 Rankine
29.6 Reaumur
17.36666667 Romer
────────────────────────────────────────────────────────── 100 C (water boils)
100 Celsius
0 Delisle
212 Fahrenheit
373.15 kelvins
33 Newton
671.67 Rankine
80 Reaumur
34.16666667 Romer
──────────────────────────────────────────────────────────── 21 degrees Kelvin
-252.15 Celsius
528.225 Delisle
-421.87 Fahrenheit
21 kelvins
-83.2095 Newton
37.8 Rankine
-201.72 Reaumur
-59.74 Romer
─────────────────────────────────────────────────────────── 0 K (outer space?)
-273.15 Celsius
559.725 Delisle
-459.67 Fahrenheit
0 kelvins
-90.1395 Newton
0 Rankine
-218.52 Reaumur
-65.34 Romer
</pre>
[Actually, water freezes at 0.000089º C, &nbsp; and boils at 99.974º C.]

===unabridged===
The REXX program can be seen at &nbsp; ──► &nbsp; [[Temperature conversion/REXX]]

This REXX version supports &nbsp; '''58''' &nbsp; temperature scales.

Scientific note: &nbsp; at temperatures above &nbsp; '''1 Planck''', &nbsp; quantum gravitational effects become relevant, and current physical theory breaks down because there is a lack of a theory of quantum gravity.


See the Wikipedia article: &nbsp; &nbsp; [http://en.wikipedia.org/wiki/Planck_temperature Planck temperature].
<br>


'''output''' &nbsp; when using the input of: &nbsp; &nbsp; <tt> 0 Fahrenheit </tt>
<pre>
───────────────────────────────────────────────────────────────── 0 Fahrenheit
255.37222222 Absolute
47.67781999 Amonton
-1 Barnsdorf
-14.35292957 Beaumuir
-21.81664121 Benart
-23.8667 Bergen
-15 Brisson
-17.77777778 Celsius
1.67777462 Cimento
992.00031276 Cruquius
-21.85185185 Dalence
-21.57297438 Dalton
-7.70075111 Daniell
3 De la Hire
-6.48011 De la Ville
176.66666667 Delisle
133.67787165 Delisle OLD
-14 De Luc
-17.5 De Lyon
174.84536082 De Revillas
72.4978 Derham
-1.5 Derham OLD
-23.7037 De Villeneuve
-17.6666 De Suede
-37.9202 Du Crest
1.37508701 Edinburgh
0.02200631 electron volts
0 Fahrenheit
-89.2727 Fahrenheit OLD
-7.42857 Florentine large
-73.9736 Florentine Magnum
1.38571 Florentine small
-83.97491258 Fowler
-73.459919 Frick
-10 gas mark
16 Goubert
-26.66666667 Hales
10.000375 Hanow
-122.44444444 Hauksbee
210.7777 Jacobs-Holborn
255.37222222 kelvins
235.222 Leiden
-5.86666667 Newton
16 Oertel
1.80241583E-30 Planck
459.67 Rankine
-14.22222222 Reaumur
3.39999781 Richter
-2.13333333 Rinaldini
2.75925926 Romer
866.84368889 Rosenthal
122.82 Royal Society of London
15.74512902 Segredo
-44.20787188 Saint-Patrice
-5.71111111 Stufe
-29.00074174 Sulzer
-0.59259259 Thermostat
-11.53701838 Wedgwood
</pre>
'''output''' &nbsp; when using the input of: &nbsp; &nbsp; <tt> 0 kelvin </tt>
<pre>
───────────────────────────────────────────────────────────────────── 0 kelvin
0 Absolute
-7.22722761 Amonton
-68.03513851 Barnsdorf
-220.52827751 Beaumuir
-342.38766729 Benart
-452.89203333 Bergen
-230.4703125 Brisson
-273.15 Celsius
-168.14455975 Cimento
-131.1567538 Cruquius
-192.1 Dalence
-infinity Dalton
-70.91221875 Daniell
-249.38503119 De la Hire
-459.51615256 De la Ville
559.725 Delisle
423.52554742 Delisle OLD
-215.105625 De Luc
-268.88203125 De Lyon
553.95463918 De Revillas
-104.21950913 Derham
-154.72333333 Derham OLD
-364.20011547 De Villeneuve
-272.01733333 De Suede
-337.00724352 Du Crest
-97.38098225 Edinburgh
0 electron volts
-459.67 Fahrenheit
-925.03633636 Fahrenheit OLD
-401.43149281 Florentine large
-766.5078253 Florentine Magnum
-172.63202157 Florentine small
-801.84922875 Fowler
-650.345769 Frick
-28.3868 gas mark
-213.835 Goubert
-409.725 Hales
-420.93486331 Hanow
-760.875 Hauksbee
-1,602.36507778 Jacobs-Holborn
0 kelvins
-20.15022222 Leiden
-90.1395 Newton
-213.835 Oertel
0 Planck
0 Rankine
-218.52 Reaumur
-206.32443969 Richter
-32.778 Rinaldini
-65.34 Romer
-11.63675556 Rosenthal
757.1646 Royal Society of London
-1,194.54976303 Segredo
-219.57210928 Saint-Patrice
-15.926 Stufe
-430.12644531 Sulzer
-9.105 Thermostat
-21.81059691 Wedgwood
</pre>

=={{header|Ring}}==
<lang ring>
k = 21.0 c = 0 r = 0 f = 0
convertTemp(k)
see "Kelvin : " + k + nl +
"Celcius : " + c + nl +
"Rankine : " + r + nl +
"Fahrenheit : " + f + nl

func convertTemp k
c = k - 273.15
r = k * 1.8
f = r - 459.67
</lang>

=={{header|Ruby}}==
<lang ruby>module TempConvert

FROM_TEMP_SCALE_TO_K =
{'kelvin' => lambda{|t| t},
'celsius' => lambda{|t| t + 273.15},
'fahrenheit' => lambda{|t| (t + 459.67) * 5/9.0},
'rankine' => lambda{|t| t * 5/9.0},
'delisle' => lambda{|t| 373.15 - t * 2/3.0},
'newton' => lambda{|t| t * 100/33.0 + 273.15},
'reaumur' => lambda{|t| t * 5/4.0 + 273.15},
'roemer' => lambda{|t| (t - 7.5) * 40/21.0 + 273.15}}

TO_TEMP_SCALE_FROM_K =
{'kelvin' => lambda{|t| t},
'celsius' => lambda{|t| t - 273.15},
'fahrenheit' => lambda{|t| t * 9/5.0 - 459.67},
'rankine' => lambda{|t| t * 9/5.0},
'delisle' => lambda{|t| (373.15 - t) * 3/2.0},
'newton' => lambda{|t| (t - 273.15) * 33/100.0},
'reaumur' => lambda{|t| (t - 273.15) * 4/5.0},
'roemer' => lambda{|t| (t - 273.15) * 21/40.0 + 7.5}}
SUPPORTED_SCALES = FROM_TEMP_SCALE_TO_K.keys.join('|')

def self.method_missing(meth, *args, &block)
if valid_temperature_conversion?(meth) then
convert_temperature(meth, *args)
else
super
end
end

def self.respond_to_missing?(meth, include_private = false)
valid_temperature_conversion?(meth) || super
end
def self.valid_temperature_conversion?(meth)
!!(meth.to_s =~ /(#{SUPPORTED_SCALES})_to_(#{SUPPORTED_SCALES})/)
end
def self.convert_temperature(meth, temp)
from_scale, to_scale = meth.to_s.split("_to_")
return temp.to_f if from_scale == to_scale # no kelvin roundtrip
TO_TEMP_SCALE_FROM_K[to_scale].call(FROM_TEMP_SCALE_TO_K[from_scale].call(temp)).round(2)
end
end</lang>
Converts all eight scales to any other scale, by means of method_missing.

Usage:
<lang ruby>TempConvert.kelvin_to_celsius 100 #=> -173.15
TempConvert.kelvin_to_fahrenheit 100 #=> -279.67
TempConvert.kelvin_to_rankine 100 #=> 180.0
TempConvert.kelvin_to_delisle 100 #=> 409.73
TempConvert.kelvin_to_newton 100 #=> -57.14
TempConvert.kelvin_to_reaumur 100 #=> -138.52
TempConvert.kelvin_to_roemer 100 #=> -83.4

TempConvert.newton_to_celsius 100 #=> 303.03
TempConvert.newton_to_fahrenheit 100 #=> 577.45
# All 64 combinations possible</lang>

=={{header|Run BASIC}}==
<lang runbasic>[loop]
input "Kelvin Degrees";kelvin
if kelvin <= 0 then end ' zero or less ends the program
celcius = kelvin - 273.15
fahrenheit = kelvin * 1.8 - 459.67
rankine = kelvin * 1.8
print kelvin;" kelvin is equal to ";celcius; " degrees celcius and ";fahrenheit;" degrees fahrenheit and ";rankine; " degrees rankine"
goto [loop]</lang>

=={{header|Scala}}==
{{libheader|Scala}}
<lang Scala>object TemperatureConversion extends App {

def kelvinToCelsius(k: Double) = k + 273.15

def kelvinToFahrenheit(k: Double) = k * 1.8 - 459.67

def kelvinToRankine(k: Double) = k * 1.8

if (args.length == 1) {
try {
val kelvin = args(0).toDouble
if (kelvin >= 0) {
println(f"K $kelvin%2.2f")
println(f"C ${kelvinToCelsius(kelvin)}%2.2f")
println(f"F ${kelvinToFahrenheit(kelvin)}%2.2f")
println(f"R ${kelvinToRankine(kelvin)}%2.2f")
} else println("%2.2f K is below absolute zero", kelvin)

} catch {
case e: NumberFormatException => System.out.println(e)
case e: Throwable => {
println("Some other exception type:")
e.printStackTrace()
}
}
} else println("Temperature not given.")
}</lang>
{{out}}
<pre>
K 21,00
C 294,15
F -421,87
R 37,80
</pre>

=={{header|Rust}}==
<lang Rust>fn main() -> std::io::Result<()> {
print!("Enter temperature in Kelvin to convert: ");
let mut input = String::new();
std::io::stdin().read_line(&mut input)?;
match input.trim().parse::<f32>() {
Ok(kelvin) => {
if kelvin < 0.0 {
println!("Negative Kelvin values are not acceptable.");
} else {
println!("{} K", kelvin);
println!("{} °C", kelvin - 273.15);
println!("{} °F", kelvin * 1.8 - 459.67);
println!("{} °R", kelvin * 1.8);
}
}

_ => println!("Could not parse the input to a number."),
}

Ok(())
}</lang>

=={{header|Scheme}}==

<lang scheme>
(import (scheme base)
(scheme read)
(scheme write))

(define (kelvin->celsius k)
(- k 273.15))

(define (kelvin->fahrenheit k)
(- (* k 1.8) 459.67))

(define (kelvin->rankine k)
(* k 1.8))

;; Run the program
(let ((k (begin (display "Kelvin : ") (flush-output-port) (read))))
(when (number? k)
(display "Celsius : ") (display (kelvin->celsius k)) (newline)
(display "Fahrenheit: ") (display (kelvin->fahrenheit k)) (newline)
(display "Rankine : ") (display (kelvin->rankine k)) (newline)))
</lang>

{{out}}
<pre>
Kelvin : 21
Celsius : -252.14999999999998
Fahrenheit: -421.87
Rankine : 37.800000000000004
</pre>

=={{header|Seed7}}==
<lang seed7>$ include "seed7_05.s7i";
include "float.s7i";

const func float: celsius (in float: kelvin) is
return kelvin - 273.15;

const func float: fahrenheit (in float: kelvin) is
return kelvin * 1.8 - 459.67;

const func float: rankine (in float: kelvin) is
return kelvin * 1.8;

const proc: main is func
local
var float: kelvin is 0.0;
begin
write("Enter temperature in kelvin: ");
readln(kelvin);
writeln("K: " <& kelvin digits 2 lpad 7);
writeln("C: " <& celsius(kelvin) digits 2 lpad 7);
writeln("F: " <& fahrenheit(kelvin) digits 2 lpad 7);
writeln("R: " <& rankine(kelvin) digits 2 lpad 7);
end func;</lang>

{{out}}
<pre>
Enter temperature in kelvin: 21.0
K: 21.00
C: -252.15
F: -421.87
R: 37.80
</pre>

=={{header|Sidef}}==
{{trans|Perl}}
<lang ruby>var scale = Hash(
Celcius => Hash.new(factor => 1 , offset => -273.15 ),
Rankine => Hash.new(factor => 1.8, offset => 0 ),
Fahrenheit => Hash.new(factor => 1.8, offset => -459.67 ),
);

var kelvin = Sys.readln("Enter a temperature in Kelvin: ").to_n;
kelvin >= 0 || die "No such temperature!";

scale.keys.sort.each { |key|
printf("%12s:%8.2f\n", key, kelvin*scale{key}{:factor} + scale{key}{:offset});
}</lang>
{{out}}
<pre>
Enter a temperature in Kelvin: 256
Celcius: -17.15
Fahrenheit: 1.13
Rankine: 460.80
</pre>

=={{header|Swift}}==

<lang swift>
func KtoC(kelvin : Double)->Double{
return kelvin-273.15
}

func KtoF(kelvin : Double)->Double{
return ((kelvin-273.15)*1.8)+32
}

func KtoR(kelvin : Double)->Double{
return ((kelvin-273.15)*1.8)+491.67
}

var k// input
print("\(k) Kelvin")
var c=KtoC(kelvin : k)
print("\(c) Celsius")
var f=KtoF(kelvin : k)
print("\(f) Fahrenheit")
var r=KtoR(kelvin : k)
print("\(r) Rankine")
</lang>

=={{header|Tcl}}==
<lang tcl>proc temps {k} {
set c [expr {$k - 273.15}]
set r [expr {$k / 5.0 * 9.0}]
set f [expr {$r - 459.67}]
list $k $c $f $r
}</lang>


Demonstrating:
<lang tcl>puts -nonewline "Enter a temperature in K: "
flush stdout
lassign [temps [gets stdin]] k c f r
puts [format "K: %.2f" $k]
puts [format "C: %.2f" $c]
puts [format "F: %.2f" $f]
puts [format "R: %.2f" $r]</lang>
{{out}}
<pre>
Enter a temperature in K: 21
K: 21.00
C: -252.15
F: -421.87
R: 37.80
</pre>

=={{header|UNIX Shell}}==

==={{header|Korn Shell}}===
{{works with|ksh}}
<lang bash>#!/bin/ksh
# Temperature conversion
typeset tt[1]=0.00 tt[2]=273.15 tt[3]=373.15
for i in {1..3}
do
((t=tt[i]))
echo $i
echo "Kelvin: $t K"
echo "Celsius: $((t-273.15)) C"
echo "Fahrenheit: $((t*18/10-459.67)) F"
echo "Rankine: $((t*18/10)) R"
done</lang>

==={{header|bash}}===
{{works with|Bourne Again SHell}}
<lang bash>#!/bin/bash
# Temperature conversion
tt[1]=0.00; tt[2]=273.15; tt[3]=373.15
for i in {1..3}
do
t=${tt[$i]}
echo $i
echo "Kelvin: $t K"
echo "Celsius: $(bc<<<"scale=2;$t-273.15") C"
echo "Fahrenheit: $(bc<<<"scale=2;$t*18/10-459.67") F"
echo "Rankine: $(bc<<<"scale=2;$t*18/10") R"
done</lang>

=={{header|Ursa}}==
<lang ursa>decl double k
while true
out "Temp. in Kelvin? " console
set k (in double console)
out "K\t" k endl "C\t" (- k 273.15) endl console
out "F\t" (- (* k 1.8) 459.67) endl "R\t" (* k 1.8) endl endl console
end while</lang>

=={{header|VBA}}==

<lang vb>
Option Explicit

Sub Main_Conv_Temp()
Dim K As Single, Result As Single
K = 21
Debug.Print "Input in Kelvin : " & Format(K, "0.00")
Debug.Print "Output in Celsius : " & IIf(ConvTemp(Result, K, "C"), Format(Result, "0.00"), False)
Debug.Print "Output in Fahrenheit : " & IIf(ConvTemp(Result, K, "F"), Format(Result, "0.00"), False)
Debug.Print "Output in Rankine : " & IIf(ConvTemp(Result, K, "R"), Format(Result, "0.00"), False)
Debug.Print "Output error : " & IIf(ConvTemp(Result, K, "T"), Format(Result, "0.00"), False)
End Sub

Function ConvTemp(sngReturn As Single, Kelv As Single, InWhat As String) As Boolean
Dim ratio As Single
ConvTemp = True
ratio = 9 / 5
Select Case UCase(InWhat)
Case "C": sngReturn = Kelv - 273.15
Case "F": sngReturn = (Kelv * ratio) - 459.67
Case "R": sngReturn = Kelv * ratio
Case Else: ConvTemp = False
End Select
End Function
</lang>
{{out}}
<pre>Input in Kelvin : 21,00
Output in Celsius : -252,15
Output in Fahrenheit : -421,87
Output in Rankine : 37,80
Output error : False</pre>

=={{header|VBScript}}==
<lang vb>
WScript.StdOut.Write "Enter the temperature in Kelvin:"
tmp = WScript.StdIn.ReadLine

WScript.StdOut.WriteLine "Kelvin: " & tmp
WScript.StdOut.WriteLine "Fahrenheit: " & fahrenheit(CInt(tmp))
WScript.StdOut.WriteLine "Celsius: " & celsius(CInt(tmp))
WScript.StdOut.WriteLine "Rankine: " & rankine(CInt(tmp))

Function fahrenheit(k)
fahrenheit = (k*1.8)-459.67
End Function

Function celsius(k)
celsius = k-273.15
End Function

Function rankine(k)
rankine = (k-273.15)*1.8+491.67
End Function
</lang>

{{Out}}
<pre>
C:\>cscript /nologo tmp.vbs
Enter the temperature in Kelvin:21
Kelvin: 21
Fahrenheit: -421.87
Celsius: -252.15
Rankine: 37.8000000000001
</pre>

=={{header|Visual FoxPro}}==
<lang vfp>#DEFINE ABSZC 273.16
#DEFINE ABSZF 459.67
LOCAL k As Double, c As Double, f As Double, r As Double, n As Integer, ;
cf As String
n = SET("Decimals")
cf = SET("Fixed")
SET DECIMALS TO 2
SET FIXED ON
CLEAR
DO WHILE .T.
k = VAL(INPUTBOX("Degrees Kelvin:", "Temperature"))
IF k <= 0
EXIT
ENDIF
? "K:", k
c = k - ABSZC
? "C:", c
f = 1.8*c + 32
? "F:", f
r = f + ABSZF
? "R:", r
?
ENDDO
SET FIXED &cf
SET DECIMALS TO n</lang>
{{out}}
<pre>
K: 21.00
C: -252.15
F: -421.87
R: 37.80
</pre>

=={{header|Wren}}==
{{libheader|Wren-fmt}}
<lang ecmascript>import "/fmt" for Fmt

var tempConv = Fn.new { |k|
var c = k - 273.15
var f = c * 1.8 + 32
var r = f + 459.67
System.print("%(Fmt.f(7, k, 2))˚ Kelvin")
System.print("%(Fmt.f(7, c, 2))˚ Celsius")
System.print("%(Fmt.f(7, f, 2))˚ Fahrenheit")
System.print("%(Fmt.f(7, r, 2))˚ Rankine")
System.print()
}

var ks = [0, 21, 100]
for (k in ks) tempConv.call(k)</lang>

{{out}}
<pre>
0.00˚ Kelvin
-273.15˚ Celsius
-459.67˚ Fahrenheit
0.00˚ Rankine

21.00˚ Kelvin
-252.15˚ Celsius
-421.87˚ Fahrenheit
37.80˚ Rankine

100.00˚ Kelvin
-173.15˚ Celsius
-279.67˚ Fahrenheit
180.00˚ Rankine
</pre>

=={{header|XLISP}}==
<lang xlisp>(DEFUN CONVERT-TEMPERATURE ()
(SETQ *FLONUM-FORMAT* "%.2f")
(DISPLAY "Enter a temperature in Kelvin.")
(NEWLINE)
(DISPLAY "> ")
(DEFINE K (READ))
(DISPLAY `(K = ,K))
(NEWLINE)
(DISPLAY `(C = ,(- K 273.15)))
(NEWLINE)
(DISPLAY `(F = ,(- (* K 1.8) 459.67)))
(NEWLINE)
(DISPLAY `(R = ,(* K 1.8))))</lang>
{{out}}
<pre>(CONVERT-TEMPERATURE)
Enter a temperature in Kelvin.
> 291.5
(K = 291.50)
(C = 18.35)
(F = 65.03)
(R = 524.70)</pre>

=={{header|XPL0}}==
<lang XPL0>include c:\cxpl\codes;
real K, C, F, R;
[ChOut(0, ^K); K:= RlIn(0);
C:= K - 273.15;
ChOut(0, ^C); RlOut(0, C); CrLf(0);
F:= 1.8*C + 32.0;
ChOut(0, ^F); RlOut(0, F); CrLf(0);
R:= F + 459.67;
ChOut(0, ^R); RlOut(0, R); CrLf(0);
]</lang>
{{out}}
<pre>
K 21
C -252.15000
F -421.87000
R 37.80000
</pre>

=={{header|zkl}}==
<lang zkl>K:=ask(0,"Kelvin: ").toFloat();
println("K %.2f".fmt(K));
println("F %.2f".fmt(K*1.8 - 459.67));
println("C %.2f".fmt(K - 273.15));
println("R %.2f".fmt(K*1.8));</lang>
{{out}}
<pre>
Kelvin: 373.15
K 373.15
F 212.00
C 100.00
R 671.67
</pre>

=={{header|ZX Spectrum Basic}}==


<pre>[celcius:-173.15 fahrenheit:-279.67 rankine:180.0]</pre>
<lang zxbasic>10 REM Translation of traditional basic version
20 INPUT "Kelvin Degrees? ";k
30 IF k <= 0 THEN STOP: REM A value of zero or less will end program
40 LET c = k - 273.15
50 LET f = k * 1.8 - 459.67
60 LET r = k * 1.8
70 PRINT k; " Kelvin is equivalent to"
80 PRINT c; " Degrees Celsius"
90 PRINT f; " Degrees Fahrenheit"
100 PRINT r; " Degrees Rankine"
110 GO TO 20</lang>

Revision as of 06:27, 20 February 2021

Arturo

<lang rebol>convertKelvins: function [k][ 

   #[
       celcius:    k - 273.15
       fahrenheit: (k * 9/5.0)-459.67
       rankine:    k * 9/5.0
   ]

]

print convertKelvins 100</lang>

Output:
[celcius:-173.15 fahrenheit:-279.67 rankine:180.0]
Retrieved from "https://rosettacode.org/wiki/Temperature_conversion?oldid=225359"