Reverse words in a string
You are encouraged to solve this task according to the task description, using any language you may know.
- Task
Reverse the order of all tokens in each of a number of strings and display the result; the order of characters within a token should not be modified.
- Example
Hey you, Bub! would be shown reversed as: Bub! you, Hey
Tokens are any non-space characters separated by spaces (formally, white-space); the visible punctuation form part of the word within which it is located and should not be modified.
You may assume that there are no significant non-visible characters in the input. Multiple or superfluous spaces may be compressed into a single space.
Some strings have no tokens, so an empty string (or one just containing spaces) would be the result.
Display the strings in order (1st, 2nd, 3rd, ···), and one string per line.
(You can consider the ten strings as ten lines, and the tokens as words.)
- Input data
(ten lines within the box)
line
╔════════════════════════════════════════╗
1 ║ ---------- Ice and Fire ------------ ║
2 ║ ║ ◄─── a blank line here.
3 ║ fire, in end will world the say Some ║
4 ║ ice. in say Some ║
5 ║ desire of tasted I've what From ║
6 ║ fire. favor who those with hold I ║
7 ║ ║ ◄─── a blank line here.
8 ║ ... elided paragraph last ... ║
9 ║ ║ ◄─── a blank line here.
10 ║ Frost Robert ----------------------- ║
╚════════════════════════════════════════╝
- Cf.
Ada
Simple_Parse
To Split a string into words, we define a Package "Simple_Parse". This package is also used for the Phrase Reversal Task [[1]].
<lang Ada>package Simple_Parse is
-- a very simplistic parser, useful to split a string into words function Next_Word(S: String; Point: in out Positive)
return String;
-- a "word" is a sequence of non-space characters
-- if S(Point .. S'Last) holds at least one word W
-- then Next_Word increments Point by len(W) and returns W.
-- else Next_Word sets Point to S'Last+1 and returns ""
end Simple_Parse;</lang>
The implementation of "Simple_Parse":
<lang Ada>package body Simple_Parse is
function Next_Word(S: String; Point: in out Positive) return String is
Start: Positive := Point;
Stop: Natural;
begin
while Start <= S'Last and then S(Start) = ' ' loop
Start := Start + 1;
end loop; -- now S(Start) is the first non-space,
-- or Start = S'Last+1 if S is empty or space-only
Stop := Start-1; -- now S(Start .. Stop) = ""
while Stop < S'Last and then S(Stop+1) /= ' ' loop
Stop := Stop + 1;
end loop; -- now S(Stop+1) is the first sopace after Start
-- or Stop = S'Last if there is no such space
Point := Stop+1;
return S(Start .. Stop);
end Next_Word;
end Simple_Parse;</lang>
Main Program
<lang Ada>with Ada.Text_IO, Simple_Parse;
procedure Reverse_Words is
function Reverse_Words(S: String) return String is
Cursor: Positive := S'First;
Word: String := Simple_Parse.Next_Word(S, Cursor);
begin
if Word = "" then
return "";
else
return Reverse_Words(S(Cursor .. S'Last)) & " " & Word;
end if;
end Reverse_Words;
use Ada.Text_IO;
begin
while not End_Of_File loop
Put_Line(Reverse_Words(Get_Line)); -- poem is read from standard input
end loop;
end Reverse_Words;</lang>
Aime
<lang aime>integer j; list l, x; text s, t;
l = list("---------- Ice and Fire ------------",
"",
"fire, in end will world the say Some",
"ice. in say Some",
"desire of tasted I've what From",
"fire. favor who those with hold I",
"",
"... elided paragraph last ...",
"",
"Frost Robert -----------------------");
for (, t in l) {
file().b_affix(t).list(x, 0);
for (j, s in x.reverse) {
o_space(sign(j));
o_text(s);
}
o_newline();
}</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
ALGOL 68
<lang algol68># returns original phrase with the order of the words reversed #
- a word is a sequence of non-blank characters #
PROC reverse word order = ( STRING original phrase )STRING:
BEGIN
STRING words reversed := "";
STRING separator := "";
INT start pos := LWB original phrase;
WHILE
# skip leading spaces #
WHILE IF start pos <= UPB original phrase
THEN original phrase[ start pos ] = " "
ELSE FALSE
FI
DO start pos +:= 1
OD;
start pos <= UPB original phrase
DO
# have another word, find it #
INT end pos := start pos;
WHILE IF end pos <= UPB original phrase
THEN original phrase[ end pos ] /= " "
ELSE FALSE
FI
DO end pos +:= 1
OD;
( original phrase[ start pos : end pos - 1 ] + separator ) +=: words reversed;
separator := " ";
start pos := end pos + 1
OD;
words reversed
END # reverse word order # ;
- reverse the words in the lines as per the task #
print( ( reverse word order ( "--------- Ice and Fire ------------ " ), newline ) ); print( ( reverse word order ( " " ), newline ) ); print( ( reverse word order ( "fire, in end will world the say Some" ), newline ) ); print( ( reverse word order ( "ice. in say Some " ), newline ) ); print( ( reverse word order ( "desire of tasted I've what From " ), newline ) ); print( ( reverse word order ( "fire. favor who those with hold I " ), newline ) ); print( ( reverse word order ( " " ), newline ) ); print( ( reverse word order ( "... elided paragraph last ... " ), newline ) ); print( ( reverse word order ( " " ), newline ) ); print( ( reverse word order ( "Frost Robert -----------------------" ), newline ) ) </lang>
- Output:
------------ Fire and Ice --------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
AppleScript
<lang AppleScript>on run
unlines(map(reverseWords, |lines|("---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------")))
end run
-- GENERIC FUNCTIONS ---------------------------------------------------------
-- reverseWords :: String -> String on reverseWords(str)
unwords(|reverse|(|words|(str)))
end reverseWords
-- |reverse| :: [a] -> [a] on |reverse|(xs)
if class of xs is text then
(reverse of characters of xs) as text
else
reverse of xs
end if
end |reverse|
-- |lines| :: Text -> [Text] on |lines|(str)
splitOn(linefeed, str)
end |lines|
-- |words| :: Text -> [Text] on |words|(str)
splitOn(space, str)
end |words|
-- ulines :: [Text] -> Text on unlines(lstLines)
intercalate(linefeed, lstLines)
end unlines
-- unwords :: [Text] -> Text on unwords(lstWords)
intercalate(space, lstWords)
end unwords
-- splitOn :: Text -> Text -> [Text] on splitOn(strDelim, strMain)
set {dlm, my text item delimiters} to {my text item delimiters, strDelim}
set lstParts to text items of strMain
set my text item delimiters to dlm
lstParts
end splitOn
-- 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
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 lambda(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 lambda : f
end script
end if
end mReturn </lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Applesoft BASIC
<lang ApplesoftBasic>100 DATA"---------- ICE AND FIRE ------------" 110 DATA" " 120 DATA"FIRE, IN END WILL WORLD THE SAY SOME" 130 DATA"ICE. IN SAY SOME " 140 DATA"DESIRE OF TASTED I'VE WHAT FROM " 150 DATA"FIRE. FAVOR WHO THOSE WITH HOLD I " 160 DATA" " 170 DATA"... ELIDED PARAGRAPH LAST ... " 180 DATA" " 190 DATA"FROST ROBERT -----------------------"
200 FOR L = 1 TO 10 210 READ T$ 220 I = LEN(T$) 240 IF I THEN GOSUB 300 : PRINT W$; : IF I THEN PRINT " "; : GOTO 240 250 PRINT 260 NEXT L 270 END
300 W$ = "" 310 FOR I = I TO 1 STEP -1 320 IF MID$(T$, I, 1) = " " THEN NEXT I : RETURN 330 FOR I = I TO 1 STEP -1 340 C$ = MID$(T$, I, 1) 350 IF C$ <> " " THEN W$ = C$ + W$ : NEXT I 360 RETURN </lang>
Arturo
<lang arturo>text: "---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------"
a: map [lines text] -> join [reverse|split & "/\s+/"] " " print [join a "\n"]</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
AutoHotkey
<lang AutoHotkey>Data := " (Join`r`n
Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert ----------------------- )"
Loop, Parse, Data, `n, `r { Loop, Parse, A_LoopField, % A_Space Line := A_LoopField " " Line Output .= Line "`n", Line := "" } MsgBox, % RTrim(Output, "`n")</lang>
AWK
<lang AWK>
- syntax: GAWK -f REVERSE_WORDS_IN_A_STRING.AWK
BEGIN {
text[++i] = "---------- Ice and Fire ------------"
text[++i] = ""
text[++i] = "fire, in end will world the say Some"
text[++i] = "ice. in say Some"
text[++i] = "desire of tasted I've what From"
text[++i] = "fire. favor who those with hold I"
text[++i] = ""
text[++i] = "... elided paragraph last ..."
text[++i] = ""
text[++i] = "Frost Robert -----------------------"
leng = i
for (i=1; i<=leng; i++) {
n = split(text[i],arr," ")
for (j=n; j>0; j--) {
printf("%s ",arr[j])
}
printf("\n")
}
exit(0)
} </lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
BaCon
<lang qbasic> PRINT REV$("---------- Ice and Fire ------------") PRINT PRINT REV$("fire, in end will world the say Some") PRINT REV$("ice. in say Some ") PRINT REV$("desire of tasted I've what From ") PRINT REV$("fire. favor who those with hold I ") PRINT PRINT REV$("... elided paragraph last ... ") PRINT PRINT REV$("Frost Robert -----------------------") </lang> Using the REV$ function which takes a sentence as a delimited string where the items are separated by a delimiter (the space character is the default delimiter).
- Output:
------------ Fire and Ice ----------
Some say the world will end in fire,
Some say in ice.
From what I've tasted of desire
I hold with those who favor fire.
... last paragraph elided ...
----------------------- Robert Frost
Batch File
<lang dos>@echo off
- The Main Thing...
cls echo. call :reverse "---------- Ice and Fire ------------" call :reverse call :reverse "fire, in end will world the say Some" call :reverse "ice. in say Some" call :reverse "desire of tasted I've what From" call :reverse "fire. favor who those with hold I" call :reverse call :reverse "... elided paragraph last ..." call :reverse call :reverse "Frost Robert -----------------------" echo. pause>nul exit
- /The Main Thing...
- The Function...
- reverse
set reversed=&set word=&set str=%1
- process
for /f "tokens=1,*" %%A in (%str%) do ( set str=%%B set word=%%A ) set reversed=%word% %reversed% set str="%str%" if not %str%=="" goto process
echo.%reversed% goto :EOF
- /The Function...</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
BBC BASIC
<lang bbcbasic> PRINT FNreverse("---------- Ice and Fire ------------")\
\ 'FNreverse("")\
\ 'FNreverse("fire, in end will world the say Some")\
\ 'FNreverse("ice. in say Some")\
\ 'FNreverse("desire of tasted I've what From")\
\ 'FNreverse("fire. favor who those with hold I")\
\ 'FNreverse("")\
\ 'FNreverse("... elided paragraph last ...")\
\ 'FNreverse("")\
\ 'FNreverse("Frost Robert -----------------------")
END
DEF FNreverse(s$)
LOCAL sp%
sp%=INSTR(s$," ")
IF sp% THEN =FNreverse(MID$(s$,sp%+1))+" "+LEFT$(s$,sp%-1) ELSE =s$</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Bracmat
<lang bracmat>("---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------"
: ?text
& ( reverse
= token tokens reversed
. :?tokens
& whl
' ( @( !arg
: ?token (" "|\t|\r) ?arg
)
& !tokens !token:?tokens
)
& !tokens !arg:?tokens
& :?reversed
& whl
' ( !tokens:%?token %?tokens
& " " !token !reversed:?reversed
)
& !tokens !reversed:?reversed
& str$!reversed
)
& :?output & whl
' ( @(!text:?line \n ?text) & !output reverse$!line \n:?output )
& !output reverse$!text:?output & out$str$!output );</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Burlesque
<lang blsq> blsq ) "It is not raining"wd<-wd "raining not is It" blsq ) "ice. in say some"wd<-wd "some say in ice." </lang>
C
<lang c>#include <stdio.h>
- include <ctype.h>
void rev_print(char *s, int n) {
for (; *s && isspace(*s); s++);
if (*s) {
char *e;
for (e = s; *e && !isspace(*e); e++);
rev_print(e, 0);
printf("%.*s%s", (int)(e - s), s, " " + n);
}
if (n) putchar('\n');
}
int main(void) {
char *s[] = {
"---------- Ice and Fire ------------",
" ",
"fire, in end will world the say Some",
"ice. in say Some ",
"desire of tasted I've what From ",
"fire. favor who those with hold I ",
" ",
"... elided paragraph last ... ",
" ",
"Frost Robert -----------------------",
0
};
int i;
for (i = 0; s[i]; i++) rev_print(s[i], 1);
return 0;
}</lang> Output is the same as everyone else's.
C++
<lang cpp>
- include <algorithm>
- include <functional>
- include <string>
- include <iostream>
- include <vector>
//code for a C++11 compliant compiler template <class BidirectionalIterator, class T> void block_reverse_cpp11(BidirectionalIterator first, BidirectionalIterator last, T const& separator) {
std::reverse(first, last);
auto block_last = first;
do {
using std::placeholders::_1;
auto block_first = std::find_if_not(block_last, last,
std::bind(std::equal_to<T>(),_1, separator));
block_last = std::find(block_first, last, separator);
std::reverse(block_first, block_last);
} while(block_last != last);
}
//code for a C++03 compliant compiler template <class BidirectionalIterator, class T> void block_reverse_cpp03(BidirectionalIterator first, BidirectionalIterator last, T const& separator) {
std::reverse(first, last);
BidirectionalIterator block_last = first;
do {
BidirectionalIterator block_first = std::find_if(block_last, last,
std::bind2nd(std::not_equal_to<T>(), separator));
block_last = std::find(block_first, last, separator);
std::reverse(block_first, block_last);
} while(block_last != last);
}
int main() {
std::string str1[] =
{
"---------- Ice and Fire ------------",
"",
"fire, in end will world the say Some",
"ice. in say Some",
"desire of tasted I've what From",
"fire. favor who those with hold I",
"",
"... elided paragraph last ...",
"",
"Frost Robert -----------------------"
};
std::for_each(begin(str1), end(str1), [](std::string& s){
block_reverse_cpp11(begin(s), end(s), ' ');
std::cout << s << std::endl;
});
std::for_each(begin(str1), end(str1), [](std::string& s){
block_reverse_cpp03(begin(s), end(s), ' ');
std::cout << s << std::endl;
});
return 0;
} </lang>
Alternate version
<lang cpp>
- include <string>
- include <iostream>
using namespace std;
string invertString( string s ) {
string st, tmp;
for( string::iterator it = s.begin(); it != s.end(); it++ )
{
if( *it != 32 ) tmp += *it;
else
{
st = " " + tmp + st;
tmp.clear();
}
}
return tmp + st;
}
int main( int argc, char* argv[] ) {
string str[] =
{
"---------- Ice and Fire ------------",
"",
"fire, in end will world the say Some",
"ice. in say Some",
"desire of tasted I've what From",
"fire. favor who those with hold I",
"",
"... elided paragraph last ...",
"",
"Frost Robert -----------------------"
};
for( int i = 0; i < 10; i++ )
cout << invertString( str[i] ) << "\n";
cout << "\n";
return system( "pause" );
} </lang>
C#
<lang csharp>using System;
public class ReverseWordsInString {
public static void Main(string[] args)
{
string text = @"
---------- Ice and Fire ------------
fire, in end will world the say Some
ice. in say Some
desire of tasted I've what From
fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------
";
foreach (string line in text.Split(Environment.NewLine)) {
//Splits on any whitespace, not just spaces
string[] words = line.Split(default(char[]), StringSplitOptions.RemoveEmptyEntries);
Array.Reverse(words);
WriteLine(string.Join(" ", words));
}
}
}</lang>
Clojure
<lang clojure> (def poem
"---------- Ice and Fire ------------ fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I ... elided paragraph last ... Frost Robert -----------------------")
(dorun
(map println (map #(apply str (interpose " " (reverse (re-seq #"[^\s]+" %)))) (clojure.string/split poem #"\n"))))
</lang> Output is the same as everyone else's.
COBOL
<lang COBOL>
program-id. rev-word.
data division.
working-storage section.
1 text-block.
2 pic x(36) value "---------- Ice and Fire ------------".
2 pic x(36) value " ".
2 pic x(36) value "fire, in end will world the say Some".
2 pic x(36) value "ice. in say Some ".
2 pic x(36) value "desire of tasted I've what From ".
2 pic x(36) value "fire. favor who those with hold I ".
2 pic x(36) value " ".
2 pic x(36) value "... elided paragraph last ... ".
2 pic x(36) value " ".
2 pic x(36) value "Frost Robert -----------------------".
1 redefines text-block.
2 occurs 10.
3 text-line pic x(36).
1 text-word.
2 wk-len binary pic 9(4).
2 wk-word pic x(36).
1 word-stack.
2 occurs 10.
3 word-entry.
4 word-len binary pic 9(4).
4 word pic x(36).
1 binary.
2 i pic 9(4).
2 pos pic 9(4).
2 word-stack-ptr pic 9(4).
procedure division.
perform varying i from 1 by 1
until i > 10
perform push-words
perform pop-words
end-perform
stop run
.
push-words.
move 1 to pos
move 0 to word-stack-ptr
perform until pos > 36
unstring text-line (i) delimited by all space
into wk-word count in wk-len
pointer pos
end-unstring
add 1 to word-stack-ptr
move text-word to word-entry (word-stack-ptr)
end-perform
.
pop-words.
perform varying word-stack-ptr from word-stack-ptr
by -1
until word-stack-ptr < 1
move word-entry (word-stack-ptr) to text-word
display wk-word (1:wk-len) space with no advancing
end-perform
display space
.
end program rev-word.
</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
CoffeeScript
<lang coffeescript>strReversed = '---------- Ice and Fire ------------\n\n fire, in end will world the say Some\n ice. in say Some\n desire of tasted I\'ve what From\n fire. favor who those with hold I\n\n ... elided paragraph last ...\n\n Frost Robert -----------------------'
reverseString = (s) ->
s.split('\n').map((l) -> l.split(/\s/).reverse().join ' ').join '\n'
console.log reverseString(strReversed)</lang>
- Output:
As JavaScript.
Common Lisp
<lang lisp>(defun split-and-reverse (str)
(labels
((iter (s lst)
(let ((s2 (string-trim '(#\space) s)))
(if s2
(let ((word-end (position #\space s2)))
(if (and word-end (< (1+ word-end) (length s2)))
(iter (subseq s2 (1+ word-end))
(cons (subseq s2 0 word-end) lst))
(cons s2 lst)))
lst))))
(iter str NIL)))
(defparameter *poem*
"---------- Ice and Fire ------------ fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I ... elided paragraph last ... Frost Robert -----------------------")
(with-input-from-string (s *poem*)
(loop for line = (read-line s NIL)
while line
do (format t "~{~a~#[~:; ~]~}~%" (split-and-reverse line))))</lang>
Output is the same as everyone else's.
D
<lang d>void main() {
import std.stdio, std.string, std.range, std.algorithm;
immutable text =
"---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------";
writefln("%(%-(%s %)\n%)",
text.splitLines.map!(r => r.split.retro));
}</lang> The output is the same as the Python entry.
EchoLisp
Using a here-string input : <lang scheme> (define S #<<
Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert ----------------------- >>#)
(for-each writeln
(for/list ((line (string-split S "\n")))
(string-join (reverse (string-split line " ")) " ")))
</lang>
- Output:
------------ Fire and Ice ----------
Some say the world will end in fire,
Some say in ice.
From what I've tasted of desire
I hold with those who favor fire.
... last paragraph elided ...
----------------------- Robert Frost
Elena
ELENA 4.1: <lang elena>import extensions; import system'routines;
public program() {
var text := new string[]::("---------- Ice and Fire ------------",
"",
"fire, in end will world the say Some",
"ice. in say Some",
"desire of tasted I've what From",
"fire. favor who those with hold I",
"",
"... elided paragraph last ...",
"",
"Frost Robert -----------------------");
text.forEach:(line)
{
line.splitBy:" ".sequenceReverse().forEach:(word)
{
console.print(word," ")
};
console.writeLine()
}
}</lang>
Elixir
<lang elixir>defmodule RC do
def reverse_words(txt) do
txt |> String.split("\n") # split lines
|> Enum.map(&( # in each line
&1 |> String.split # split words
|> Enum.reverse # reverse words
|> Enum.join(" "))) # rejoin words
|> Enum.join("\n") # rejoin lines
end
end</lang> Usage: <lang elixir>txt = """
Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert ----------------------- """
IO.puts RC.reverse_words(txt)</lang>
Elm
<lang elm> reversedPoem =
String.trim """ ---------- Ice and Fire ------------ fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I ... elided paragraph last ... Frost Robert ----------------------- """
reverseWords string =
string |> String.words |> List.reverse |> String.join " "
reverseLinesWords string =
string |> String.lines |> List.map reverseWords |> String.join "\n"
poem =
reverseLinesWords reversedPoem
</lang>
Emacs Lisp
<lang Emacs Lisp> (defun reverse-words (line)
(insert
(format "%s\n"
(mapconcat 'identity (reverse (split-string line)) " "))))
(defun reverse-lines (lines)
(mapcar 'reverse-words lines))
(reverse-lines
'("---------- Ice and Fire ------------"
""
"fire, in end will world the say Some"
"ice. in say Some"
"desire of tasted I've what From"
"fire. favor who those with hold I"
""
"... elided paragraph last ..."
""
"Frost Robert ----------------------- "))
</lang> Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Factor
<lang factor>USING: io sequences splitting ; IN: rosetta-code.reverse-words
"---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------"
"\n" split [ " " split reverse " " join ] map [ print ] each</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Forth
The method shown is based on submissions in comp.lang.forth. Comments have been added for those less familiar with reading Forth. This example makes use of the Forth interpreter/compiler internals by calling PARSE-NAME which is a Forth 2012 word that parses the input stream, ignores leading spaces and delimits at the space character. This method makes clever use of the data stack. Strings are not copied in memory by rather pointers are collected on the stack as PARSE-NAME processes a sentence. This of course leaves the strings in the reversed order so they are simply printed off the data stack. <lang>create buf 1000 chars allot \ string buffer buf value pp \ pp points to buffer address
- tr ( caddr u -- )
dup >r pp swap cmove \ move string into buffer
r> pp + to pp ; \ advance pointer by u bytes
- collect ( -- addr len .. addr[n] len[n]) \ words deposit on data stack
begin
parse-name dup \ parse input stream, dup the len
while \ while stack <> 0
tuck pp >r tr r> swap
repeat
2drop ; \ clean up stack
- reverse ( -- )
buf to pp \ initialize pointer to buffer address
collect
depth 2/ 0 ?do type space loop \ type the strings with a trailing space
cr ; \ final new line
reverse ---------- Ice and Fire ------------ reverse reverse fire, in end will world the say Some reverse ice. in say Some reverse desire of tasted I've what From reverse fire. favor who those with hold I reverse reverse ... elided paragraph last ... reverse reverse Frost Robert -----------------------</lang>
Output Interpreted above code at the Forth console
Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost ok
Fortran
Compiled using G95 on x86 system running Puppy Linux. Fortran syntax is mostly Fortran 77.
<lang fortran>
character*40 words
character*40 reversed
logical inblank
ierr=0
read (5,fmt="(a)",iostat=ierr)words
do while (ierr.eq.0)
inblank=.true.
ipos=1
do i=40,1,-1
if(words(i:i).ne.' '.and.inblank) then
last=i
inblank=.false.
end if
if(.not.inblank.and.words(i:i).eq.' ') then
reversed(ipos:ipos+last-i)=words(i+1:last)
ipos=ipos+last-i+1
inblank=.true.
end if
if(.not.inblank.and.i.eq.1) then
reversed(ipos:ipos+last-1)=words(1:last)
ipos=ipos+last
end if
end do
print *,words,'=> ',reversed(1:ipos-1)
read (5,fmt="(a)",iostat=ierr)words
end do
end
</lang>
Output from comand: cat frostPoem.txt | reverse
where file frostPoem.txt contains the input text.
---------- Ice and Fire ----------- => ----------- Fire and Ice ----------
=>
fire, in end will world the say Some => Some say the world will end in fire,
ice. in say Some => Some say in ice.
desire of tasted I've what From => From what I've tasted of desire
fire. favor who those with hold I => I hold with those who favor fire.
=>
... elided paragraph last ... => ... last paragraph elided ...
=>
Frost Robert ----------------------- => ----------------------- Robert Frost
FreeBASIC
<lang freebasic>' FB 1.05.0 Win64
Sub split (s As String, sepList As String, result() As String, removeEmpty As Boolean = False)
If s = "" OrElse sepList = "" Then
Redim result(0)
result(0) = s
Return
End If
Dim As Integer i, j, count = 0, empty = 0, length
Dim As Integer position(Len(s) + 1)
position(0) = 0
For i = 0 To len(s) - 1
For j = 0 to Len(sepList) - 1
If s[i] = sepList[j] Then
count += 1
position(count) = i + 1
End If
Next j
Next i
Redim result(count) If count = 0 Then result(0) = s Return End If
position(count + 1) = len(s) + 1 For i = 1 To count + 1 length = position(i) - position(i - 1) - 1 result(i - 1 - empty) = Mid(s, position(i - 1) + 1, length) If removeEmpty Andalso CBool(length = 0) Then empty += 1 Next
If empty > 0 Then Redim Preserve result(count - empty)
End Sub
Dim s As String = "Hey you, Bub!" Dim a() As String split(s, " ", a(), true) Dim reversed As String = "" For i As Integer = UBound(a) To LBound(a) Step -1
reversed += a(i) If i > LBound(a) Then reversed += " "
Next
Print "Original String = "; s Print "Reversed String = "; reversed Print Print "Press any key to quit" Sleep</lang>
- Output:
Original String = Hey you, Bub! Reversed String = Bub! you, Hey
Frink
<lang frink> lines=split["\n", """---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
.. elided paragraph last ...
Frost Robert -----------------------"""]
for line = lines
println[join[" ", reverse[split[%r/\s+/, line]]]]
</lang>
Gema
<lang gema>\L<G> =@{$2} $1</lang>
Gambas
Click this link to run this code <lang gambas>Public Sub Main() Dim sString As New String[10] 'Array for the input text Dim sLine As New String[] 'Array of each word in a line Dim siCount0, siCount1 As Short 'Counters Dim sOutput, sReverse, sTemp As String 'Strings
sString[0] = "---------- Ice And Fire ------------" 'Input text sString[1] = " " sString[2] = "fire, in end will world the say Some" sString[3] = "ice. in say Some " sString[4] = "desire of tasted I've what From " sString[5] = "fire. favor who those with hold I " sString[6] = " " sString[7] = "... elided paragraph last ... " sString[8] = " " sString[9] = "Frost Robert -----------------------"
For siCount0 = 0 To 9 'To work through each line of input text
If Trim(sString[siCount0]) = "" Then sString[siCount0] = " " 'If the line is all spaces then make it 1 space For Each sTemp In Split(Trim(sString[siCount0]), " ") 'Split the trimmed line by spaces sLine.Add(sTemp) 'Add each word to the sLine array Next For siCount1 = sLine.max DownTo 0 'Loop from the last in the sLine array to 0 sReverse &= sLine[siCount1] & " " 'Fill sReverse with words reversed, adding a space Next sOutput &= Trim(sReverse) & gb.NewLine 'Add the reversed words to sOutput and add a newline sReverse = "" 'Clear sReverse sLine.Clear 'Clear sLine array
Next
Print sOutput 'Print the output
End</lang> Output:
------------ Fire And Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Go
<lang go>package main
import (
"fmt" "strings"
)
// a number of strings var n = []string{
"---------- Ice and Fire ------------", " ", "fire, in end will world the say Some", "ice. in say Some ", "desire of tasted I've what From ", "fire. favor who those with hold I ", " ", "... elided paragraph last ... ", " ", "Frost Robert -----------------------",
}
func main() {
for i, s := range n {
t := strings.Fields(s) // tokenize
// reverse
last := len(t) - 1
for j, k := range t[:len(t)/2] {
t[j], t[last-j] = t[last-j], k
}
n[i] = strings.Join(t, " ")
}
// display result
for _, t := range n {
fmt.Println(t)
}
}</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Groovy
<lang groovy>def text = new StringBuilder()
.append('---------- Ice and Fire ------------\n')
.append(' \n')
.append('fire, in end will world the say Some\n')
.append('ice. in say Some \n')
.append('desire of tasted I\'ve what From \n')
.append('fire. favor who those with hold I \n')
.append(' \n')
.append('... elided paragraph last ... \n')
.append(' \n')
.append('Frost Robert -----------------------\n').toString()
text.eachLine { line ->
println "$line --> ${line.split(' ').reverse().join(' ')}"
}</lang>
- Output:
---------- Ice and Fire ------------ --> ------------ Fire and Ice ----------
-->
fire, in end will world the say Some --> Some say the world will end in fire,
ice. in say Some --> Some say in ice.
desire of tasted I've what From --> From what I've tasted of desire
fire. favor who those with hold I --> I hold with those who favor fire.
-->
... elided paragraph last ... --> ... last paragraph elided ...
-->
Frost Robert ----------------------- --> ----------------------- Robert FrostHaskell
<lang Haskell> revstr :: String -> String revstr = unwords . reverse . words -- point-free style --equivalent: --revstr s = unwords (reverse (words s))
revtext :: String -> String revtext = unlines . map revstr . lines -- applies revstr to each line independently
test = revtext "---------- Ice and Fire ------------\n\
\\n\
\fire, in end will world the say Some\n\
\ice. in say Some\n\
\desire of tasted I've what From\n\
\fire. favor who those with hold I\n\
\\n\
\... elided paragraph last ...\n\
\\n\
\Frost Robert -----------------------\n" --multiline string notation requires \ at end and start of lines, and \n to be manually input
</lang> unwords, reverse, words, unlines, map and lines are built-in functions, all available at GHC's Prelude. For better visualization, use "putStr test"
Icon and Unicon
Works in both languages: <lang unicon>procedure main()
every write(rWords(&input))
end
procedure rWords(f)
every !f ? {
every (s := "") := genWords() || s
suspend s
}
end
procedure genWords()
while w := 1(tab(upto(" \t")),tab(many(" \t"))) || " " do suspend w
end</lang>
- Output:
for test file
->rw <rw.in ------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost ->
J
Treated interactively:
<lang J> ([:;@|.[:<;.1 ' ',]);._2]0 :0
Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------
)
------------ Fire and Ice ----------
Some say the world will end in fire,
Some say in ice.
From what I've tasted of desire
I hold with those who favor fire.
... last paragraph elided ...
----------------------- Robert Frost
</lang>
The verb phrase ( [: ; @ |. [: < ;. 1 ' ' , ]) reverses words in a string. The rest of the implementation has to do with defining the block of text we are working on, and applying this verb phrase to each line of that text.
Java
<lang java>public class ReverseWords {
static final String[] lines = {
" ----------- Ice and Fire ----------- ",
" ",
" fire, in end will world the say Some ",
" ice. in say Some ",
" desire of tasted I've what From ",
" fire. favor who those with hold I ",
" ",
" ... elided paragraph last ... ",
" Frost Robert ----------------------- "};
public static void main(String[] args) {
for (String line : lines) {
String[] words = line.split("\\s");
for (int i = words.length - 1; i >= 0; i--)
System.out.printf("%s ", words[i]);
System.out.println();
}
}
}</lang>
<lang java>package string;
import static java.util.Arrays.stream;
public interface ReverseWords {
public static final String[] LINES = {
" ----------- Ice and Fire ----------- ",
" ",
" fire, in end will world the say Some ",
" ice. in say Some ",
" desire of tasted I've what From ",
" fire. favor who those with hold I ",
" ",
" ... elided paragraph last ... ",
" Frost Robert ----------------------- "
};
public static String[] reverseWords(String[] lines) {
return stream(lines)
.parallel()
.map(l -> l.split("\\s"))
.map(ws -> stream(ws)
.parallel()
.map(w -> " " + w)
.reduce(
"",
(w1, w2) -> w2 + w1
)
)
.toArray(String[]::new)
;
}
public static void main(String... arguments) {
stream(reverseWords(LINES))
.forEach(System.out::println)
;
}
}</lang>
- Output:
----------- Fire and Ice ----------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
JavaScript
<lang javascript>var strReversed = "---------- Ice and Fire ------------\n\ \n\ fire, in end will world the say Some\n\ ice. in say Some\n\ desire of tasted I've what From\n\ fire. favor who those with hold I\n\ \n\ ... elided paragraph last ...\n\ \n\ Frost Robert -----------------------";
function reverseString(s) {
return s.split('\n').map(
function (line) {
return line.split(/\s/).reverse().join(' ');
}
).join('\n');
}
console.log(
reverseString(strReversed)
);</lang>
Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
jq
<lang jq>split("[ \t\n\r]+") | reverse | join(" ")</lang> This solution requires a version of jq with regex support for split.
The following example assumes the above line is in a file named reverse_words.jq and that the input text is in a file named IceAndFire.txt. The -r option instructs jq to read the input file as strings, line by line.<lang sh>$ jq -R -r -M -f reverse_words.jq IceAndFire.txt
Fire and Ice ----------
Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire.
... last paragraph elided ...
Robert Frost</lang>
Jsish
From Javascript entry. <lang javascript>var strReversed = "---------- Ice and Fire ------------\n fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I \n... elided paragraph last ...\n Frost Robert -----------------------";
function reverseString(s) {
return s.split('\n').map(
function (line) {
return line.split().reverse().join(' ');
}
).join('\n');
}
- reverseString('Hey you, Bub!');
- strReversed;
- reverseString(strReversed);
/*
!EXPECTSTART!
reverseString('Hey you, Bub!') ==> Bub! you, Hey strReversed ==> ---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert ----------------------- reverseString(strReversed) ==> ------------ Fire and Ice ----------
Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire.
... last paragraph elided ...
Robert Frost
!EXPECTEND!
- /</lang>
- Output:
prompt$ jsish -u reverseWords.jsi [PASS] reverseWords.jsi
Julia
<lang Julia>revstring (str) = join(reverse(split(str, " ")), " ")</lang>
- Output:
julia> revstring("Hey you, Bub!")
"Bub! you, Hey"
julia> s = IOBuffer(
"---------- Ice and Fire ------------
fire, in end will world the say Some
ice. in say Some
desire of tasted I've what From
fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------")
julia> for line in eachline(s)
println(revstring(chomp(line)))
end
------------ Fire and Ice ----------
Some say the world will end in fire,
Some say in ice.
From what I've tasted of desire
I hold with those who favor fire.
... last paragraph elided ...
----------------------- Robert FrostKotlin
<lang scala>// version 1.0.6
fun reversedWords(s: String) = s.split(" ").reversed().joinToString(" ")
fun main(args: Array<String>) {
val s = "Hey you, Bub!"
println(reversedWords(s))
println()
val sl = listOf(
" ---------- Ice and Fire ------------ ",
" ",
" fire, in end will world the say Some ",
" ice. in say Some ",
" desire of tasted I've what From ",
" fire. favor who those with hold I ",
" ",
" ... elided paragraph last ... ",
" ",
" Frost Robert ----------------------- "
)
sl.forEach { println(reversedWords(it).trimStart()) }
}</lang>
- Output:
Bub! you, Hey ------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Liberty BASIC
<lang lb> for i = 1 to 10
read string$ print reverse$(string$)
next end
function reverse$(string$)
token$="*"
while token$<>""
i=i+1
token$ = word$(string$, i)
output$=token$+" "+output$
wend
reverse$ = trim$(output$)
end function
data "---------- Ice and Fire ------------" data "" data "fire, in end will world the say Some" data "ice. in say Some" data "desire of tasted I've what From" data "fire. favor who those with hold I" data "" data "... elided paragraph last ..." data "" data "Frost Robert -----------------------" </lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
LiveCode
The input text has been entered into the contents of a text field called "Fieldtxt", add a button and put the following in its mouseUp <lang LiveCode>repeat for each line txtln in fld "Fieldtxt"
repeat with i = the number of words of txtln down to 1
put word i of txtln & space after txtrev
end repeat
put cr after txtrev -- preserve line
end repeat put txtrev</lang>
LiveScript
<lang livescript> poem =
""" ---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert ----------------------- """
reverse-words = (.split ' ') >> (.reverse!) >> (.join ' ') reverse-string = (.split '\n') >> (.map reverse-words) >> (.join '\n') reverse-string poem </lang>
Logo
This version just reads the words from standard input.
<lang logo>do.until [
make "line readlist print reverse :line
] [word? :line] bye</lang>
- Output:
Given this input:
---------- Ice and Fire ------------ fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I ... elided paragraph last ... Frost Robert -----------------------
it produces this output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Lua
See below for original entry and the input string under variable 's'. Here is a significantly shorter program.
<lang lua> local lines = {} for line in (s .. "\n"):gmatch("(.-)\n") do local this = {} for word in line:gmatch("%S+") do table.insert(this, 1, word) end lines[#lines + 1] = table.concat(this, " ") end print(table.concat(lines, "\n")) </lang>
Original response:
(Note: The Wiki's syntax highlighting for Lua does not highlight the following valid string literal correctly, so the listing is split in two parts.)
s = [[---------- Ice and Fire ------------ fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I ... elided paragraph last ... Frost Robert ----------------------- ]]
<lang lua>function table.reverse(a)
local res = {}
for i = #a, 1, -1 do
res[#res+1] = a[i]
end
return res
end
function splittokens(s)
local res = {}
for w in s:gmatch("%S+") do
res[#res+1] = w
end
return res
end
for line, nl in s:gmatch("([^\n]-)(\n)") do
print(table.concat(table.reverse(splittokens(line)), ' '))
end</lang>
Note: With the technique used here for splitting s into lines (not part of the task) the last line will be gobbled up if it does not end with a newline.
Maple
<lang Maple>while (true) do input := readline("input.txt"): if input = 0 then break: fi: input := StringTools:-Trim(input): # remove leading/trailing space input := StringTools:-Join(ListTools:-Reverse(StringTools:-Split(input, " "))," "): printf("%s\n", input): od:</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Mathematica
<lang Mathematica>poem = "---------- Ice and Fire ------------
fire, in end will world the say Some
ice. in say Some
desire of tasted I've what From
fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------";
lines = StringSplit[poem, "\n"]; wordArray = StringSplit[#] & @ lines ; reversedWordArray = Reverse[#] & /@ wordArray ; linesWithReversedWords =
StringJoin[Riffle[#, " "]] & /@ reversedWordArray;
finaloutput = StringJoin[Riffle[#, "\n"]] & @ linesWithReversedWords</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
MATLAB
<lang MATLAB>function testReverseWords
testStr = {'---------- Ice and Fire ------------' ; ...
; ...
'fire, in end will world the say Some' ; ...
'ice. in say Some' ; ...
'desire of tasted Ive what From' ; ...
'fire. favor who those with hold I' ; ...
; ...
'... elided paragraph last ...' ; ...
; ...
'Frost Robert -----------------------' };
for k = 1:length(testStr)
fprintf('%s\n', reverseWords(testStr{k}))
end
end
function strOut = reverseWords(strIn)
strOut = strtrim(strIn);
if ~isempty(strOut)
% Could use strsplit() instead of textscan() in R2013a or later
words = textscan(strOut, '%s');
words = words{1};
strOut = strtrim(sprintf('%s ', words{end:-1:1}));
end
end</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
MAXScript
<lang maxscript> -- MAXScript : Reverse words in a string : N.H. 2019 -- ( text = stringstream "---------- Ice and Fire ------------\n\nfire, in end will world the say Some\nice. in say Some\ndesire of tasted I've what From\nfire. favor who those with hold I\n\n... elided paragraph last ...\n\nFrost Robert -----------------------\n" clearListener() seek text 0 while eof text == false do ( nextLine = (readLine text) if nextLine == "" then ( print "" continue ) -- end of if revLine = "" eachWord = filterString nextLine " " for k = eachWord.count to 1 by -1 do ( revLine = revLine + eachWord[k] -- Only add space between words not at the end of line if k != 1 then revLine = revLine + " " ) -- end of for k print revLine ) -- end of while eof ) </lang>
- Output:
Output to MAXScript Listener:
"------------ Fire and Ice ----------" "" "Some say the world will end in fire," "Some say in ice." "From what I've tasted of desire" "I hold with those who favor fire." "" "... last paragraph elided ..." "" "----------------------- Robert Frost"
MiniScript
<lang MiniScript>lines = ["==========================================",
"| ---------- Ice and Fire ------------ |", "| |", "| fire, in end will world the say Some |", "| ice. in say Some |", "| desire of tasted I've what From |", "| fire. favor who those with hold I |", "| |", "| ... elided paragraph last ... |", "| |", "| Frost Robert ----------------------- |", "=========================================="]
for line in lines
oldLine = line.split newLine = [] while oldLine
// the line below line retains the outer box format
newLine.push oldLine.pop
// alternate format, replace above line with below two lines below to strip all superfluous spaces // word = oldLine.pop // if word != "" then newLine.push word
end while print newLine.join
end for</lang>
- Output:
========================================== | ------------ Fire and Ice ---------- | | | | Some say the world will end in fire, | | Some say in ice. | | From what I've tasted of desire | | I hold with those who favor fire. | | | | ... last paragraph elided ... | | | | ----------------------- Robert Frost | ==========================================
Modula-2
<lang modula2> MODULE ReverseWords;
FROM STextIO IMPORT
WriteString, WriteLn;
FROM Strings IMPORT
Assign, Concat, Append;
CONST
NL = CHR(10); Sp = ' '; Txt = "---------- Ice and Fire -----------" + NL + NL + "fire, in end will world the say Some" + NL + "ice. in say Some" + NL + "desire of tasted I've what From" + NL + "fire. favor who those with hold I" + NL + NL + "... elided paragraph last ..." + NL + NL + "Frost Robert -----------------------" + NL;
TYPE
String400 = ARRAY [0 .. 399] OF CHAR;
PROCEDURE AddWord(Source: ARRAY OF CHAR; VAR INOUT Destination: ARRAY OF CHAR); VAR
R: String400;
BEGIN
Concat(Source, Sp, R); Append(Destination, R); Assign(R, Destination);
END AddWord;
VAR
I: CARDINAL; SingleWord, CurrentLine: String400; C: CHAR;
BEGIN
SingleWord := "";
CurrentLine := "";
FOR I := 0 TO HIGH(Txt) DO
C := Txt[I];
CASE C OF
Sp:
AddWord(SingleWord, CurrentLine);
SingleWord := ""; |
NL:
AddWord(SingleWord, CurrentLine);
WriteString(CurrentLine);
WriteLn;
SingleWord := "";
CurrentLine := ""; |
ELSE
Append(C, SingleWord);
END;
END;
END ReverseWords. </lang>
Nanoquery
<lang nanoquery>def reverse_words(string)
tokens = split(string, " ")
if len(tokens) = 0
return ""
end
ret_str = ""
for i in range(len(tokens) - 1, 0)
ret_str += tokens[i] + " "
end
return ret_str.substring(0, len(ret_str) - 1)
end
data = "---------- Ice and Fire ------------\n" +\
" \n" +\
"fire, in end will world the say Some\n" +\
"ice. in say Some \n" +\
"desire of tasted I've what From \n" +\
"fire. favor who those with hold I \n" +\
" \n" +\
"... elided paragraph last ... \n" +\
"Frost Robert -----------------------\n"
for line in split(data, "\n")
println reverse_words(line)
end</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Nial
<lang Nial>
- Define a function to convert a list of strings to a single string.
join is rest link (' ' eachboth link)
iterate (write join reverse (' ' string_split)) \
\ \ '------------ Eldorado ----------' \ \ '... here omitted lines ...' \ \ 'Mountains the "Over' \ 'Moon, the Of' \ 'Shadow, the of Valley the Down' \ 'ride," boldly Ride,' \ 'replied,--- shade The' \ 'Eldorado!" for seek you "If' \ \ 'Poe Edgar -----------------------'
</lang>
- Output:
---------- Eldorado ------------ ... lines omitted here ... "Over the Mountains Of the Moon, Down the Valley of the Shadow, Ride, boldly ride," The shade replied,--- "If you seek for Eldorado!" ----------------------- Edgar Poe
Nim
<lang nim>import strutils
let text = """---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------"""
proc reversed*[T](a: openArray[T], first, last: int): seq[T] =
result = newSeq[T](last - first + 1) var x = first var y = last while x <= last: result[x] = a[y] dec(y) inc(x)
proc reversed*[T](a: openArray[T]): seq[T] =
reversed(a, 0, a.high)
for line in text.splitLines():
echo line.split(' ').reversed().join(" ")</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Objeck
<lang objeck>use Collection;
class Reverselines {
function : Main(args : String[]) ~ Nil {
lines := List->New();
lines->AddBack("---------- Ice and Fire ------------");
lines->AddBack("");
lines->AddBack("fire, in end will world the say Some");
lines->AddBack("ice. in say Some");
lines->AddBack("desire of tasted I've what From");
lines->AddBack("fire. favor who those with hold I");
lines->AddBack("");
lines->AddBack("... elided paragraph last ...");
lines->AddBack("");
lines->AddBack("Frost Robert -----------------------");
lines->Rewind();
each(i : lines) {
words := lines->Get()->As(String)->Split(" ");
if(words <> Nil) {
for(j := words->Size() - 1; j > -1; j-=1;) {
IO.Console->Print(words[j])->Print(" ");
};
};
IO.Console->PrintLine();
lines->Next();
};
}
}</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
OCaml
<lang ocaml>#load "str.cma" let input = ["---------- Ice and Fire ------------";
"";
"fire, in end will world the say Some";
"ice. in say Some";
"desire of tasted I've what From";
"fire. favor who those with hold I";
"";
"... elided paragraph last ...";
"";
"Frost Robert -----------------------"];;
let splitted = List.map (Str.split (Str.regexp " ")) input in let reversed = List.map List.rev splitted in let final = List.map (String.concat " ") reversed in List.iter print_endline final;;</lang> Sample usage
$ ocaml reverse.ml ------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Oforth
<lang Oforth>: revWords(s)
s words reverse unwords ;
- reverseWords
"---------- Ice and Fire ------------" revWords println " " revWords println "fire, in end will world the say Some" revWords println "ice. in say Some " revWords println "desire of tasted I've what From " revWords println "fire. favor who those with hold I " revWords println " " revWords println "... elided paragraph last ... " revWords println " " revWords println "Frost Robert -----------------------" revWords println ;</lang>
- Output:
>reverseWords ------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost ok
Pascal
Free Pascal 3.0.0 <lang pascal>program Reverse_words(Output); {$H+}
const
nl = chr(10); // Linefeed sp = chr(32); // Space TXT = '---------- Ice and Fire -----------'+nl+ nl+ 'fire, in end will world the say Some'+nl+ 'ice. in say Some'+nl+ 'desire of tasted Ive what From'+nl+ 'fire. favor who those with hold I'+nl+ nl+ '... elided paragraph last ...'+nl+ nl+ 'Frost Robert -----------------------'+nl;
var
I : integer; ew, lw : ansistring; c : char;
function addW : ansistring; var r : ansistring = ; begin
r := ew + sp + lw; ew := ; addW := r
end;
begin
ew := ; lw := ;
for I := 1 to strlen(TXT) do
begin
c := TXT[I];
case c of
sp : lw := addW;
nl : begin writeln(addW); lw := end;
else ew := ew + c
end;
end;
readln;
end.</lang>
- Output:
----------- Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Perl
<lang perl>print join(" ", reverse split), "\n" for ; __DATA__
Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert ----------------------- </lang>
Perl 6
We'll read input from stdin <lang perl6>say ~.words.reverse for lines</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Phix
<lang Phix>constant test="""
Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert ----------------------- """ sequence lines = split(test,'\n') for i=1 to length(lines) do
lines[i] = join(reverse(split(lines[i])))
end for puts(1,join(lines,"\n"))</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
PicoLisp
<lang PicoLisp> (in "FireIce.txt"
(until (eof) (prinl (glue " " (flip (split (line) " "))))))
</lang>
- Output:
Same as anybody else.
PL/I
<lang PL/I>rev: procedure options (main); /* 5 May 2014 */
declare (s, reverse) character (50) varying; declare (i, j) fixed binary; declare in file;
open file (in) title ('/REV-WRD.DAT,type(text),recsize(5> Nil) {
for(j := words->Size() - 1; j > -1; j-=1;) {
IO.Console->Print(words[j])->Print(" ");
};
};
IO.Console->PrintLine();
lines->Next();
};
}
}0)');
do j = 1 to 10;
get file (in) edit (s) (L);
put skip list (trim(s));
reverse = ;
do while (length(s) > 0);
s = trim(s);
i = index(s, ' ');
if i = 0 then
if s ^= then i = length(s)+1;
if i > 0 then reverse = substr(s, 1, i-1) || ' ' || reverse;
if length(s) = i then s = ; else s = substr(s, i);
end;
put edit ('---> ', reverse) (col(40), 2 A);
end;
end rev;</lang>
- Output:
---------- Ice and Fire ------------ ---> ------------ Fire and Ice ----------
--->
fire, in end will world the say Some ---> Some say the world will end in fire,
ice. in say Some ---> Some say in ice.
desire of tasted I've what From ---> From what I've tasted of desire
fire. favor who those with hold I ---> I hold with those who favor fire.
--->
... elided paragraph last ... ---> ... last paragraph elided ...
--->
Frost Robert ----------------------- ---> ----------------------- Robert Frost
PowerShell
<lang PowerShell> Function Reverse-Words($lines) {
$lines | foreach {
$array = $PSItem.Split(' ')
$array[($array.Count-1)..0] -join ' '
}
}
$lines = "---------- Ice and Fire ------------", "", "fire, in end will world the say Some", "ice. in say Some", "desire of tasted I've what From", "fire. favor who those with hold I", "", "... elided paragraph last ...", "", "Frost Robert -----------------------"
Reverse-Words($lines) </lang>
output :
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
PureBasic
<lang purebasic>a$ = "---------- Ice and Fire ------------" +#CRLF$+
" " +#CRLF$+
"fire, in end will world the say Some" +#CRLF$+
"ice. in say Some " +#CRLF$+
"desire of tasted I've what From " +#CRLF$+
"fire. favor who those with hold I " +#CRLF$+
" " +#CRLF$+
"... elided paragraph last ... " +#CRLF$+
" " +#CRLF$+
"Frost Robert -----------------------" +#CRLF$
a$ = "Hey you, Bub! " +#CRLF$+#CRLF$+ a$
OpenConsole() For p1=1 To CountString(a$,#CRLF$)
b$=StringField(a$,p1,#CRLF$) : c$="" For p2=1 To CountString(b$,Chr(32))+1 c$=StringField(b$,p2,Chr(32))+Space(1)+c$ Next PrintN(LSet(b$,36,Chr(32))+" ---> "+Trim(c$))
Next Input() </lang>
- Output:
Hey you, Bub! ---> Bub! you, Hey
--->
---------- Ice and Fire ------------ ---> ------------ Fire and Ice ----------
--->
fire, in end will world the say Some ---> Some say the world will end in fire,
ice. in say Some ---> Some say in ice.
desire of tasted I've what From ---> From what I've tasted of desire
fire. favor who those with hold I ---> I hold with those who favor fire.
--->
... elided paragraph last ... ---> ... last paragraph elided ...
--->
Frost Robert ----------------------- ---> ----------------------- Robert Frost
PHP
<lang php> <?php
function strInv ($string) {
$str_inv = ;
for ($i=0,$s=count($string);$i<$s;$i++){
$str_inv .= implode(' ',array_reverse(explode(' ',$string[$i])));
$str_inv .= '
';
}
return $str_inv;
} $string[] = "---------- Ice and Fire ------------"; $string[] = ""; $string[] = "fire, in end will world the say Some"; $string[] = "ice. in say Some"; $string[] = "desire of tasted I've what From"; $string[] = "fire. favor who those with hold I"; $string[] = ""; $string[] = "... elided paragraph last ..."; $string[] = ""; $string[] = "Frost Robert ----------------------- ";
echo strInv($string);</lang>
Output:
<lang Shell>------------ Fire and Ice ----------
Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire.
... last paragraph elided ...
Robert Frost</lang>
Pike
<lang Pike>string story = #"---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------";
foreach(story/"\n", string line)
write("%s\n", reverse(line/" ")*" ");
</lang>
Python
<lang python> text = \
Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------
for line in text.split('\n'): print(' '.join(line.split()[::-1]))</lang>
Output:
<lang Shell>------------ Fire and Ice ----------
Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire.
... last paragraph elided ...
Robert Frost</lang>
R
<lang R> whack <- function(s) {
paste( rev( unlist(strsplit(s, " "))), collapse=' ' ) }
poem <- unlist( strsplit( '------------ Eldorado ----------
... here omitted lines ...
Mountains the "Over Moon, the Of Shadow, the of Valley the Down ride," boldly Ride, replied,--- shade The Eldorado!" for seek you "If
Poe Edgar -----------------------', "\n"))
for (line in poem) cat( whack(line), "\n" ) </lang>
- Output:
---------- Eldorado ------------ ... lines omitted here ... "Over the Mountains Of the Moon, Down the Valley of the Shadow, Ride, boldly ride," The shade replied,--- "If you seek for Eldorado!" ----------------------- Edgar Poe
As a dangerous stunt, let's redefine "{". (Everything that happens in R is a function-call.)
<lang R> > `{` <- function(s) rev(unlist(strsplit(s, " "))) > {"one two three four five"} [1] "five" "four" "three" "two" "one" </lang>
You had better restart your REPL after trying this.
Racket
<lang racket>#lang racket/base
(require racket/string)
(define (split-reverse str)
(string-join (reverse (string-split str))))
(define poem
"---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------")
(let ([poem-port (open-input-string poem)])
(let loop ([l (read-line poem-port)])
(unless (eof-object? l)
(begin (displayln (split-reverse l))
(loop (read-line poem-port))))))
</lang>
Red
<lang Red>Red [] foreach line split {---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------} newline [
print reverse split line " "
] </lang>
REXX
natural order
This REXX version process the words in a natural order (first to last). <lang rexx>/*REXX program reverses the order of tokens in a string (but not the letters).*/ @.=; @.1 = "---------- Ice and Fire ------------"
@.2 = ' '
@.3 = "fire, in end will world the say Some"
@.4 = "ice. in say Some"
@.5 = "desire of tasted I've what From"
@.6 = "fire. favor who those with hold I"
@.7 = ' '
@.8 = "... elided paragraph last ..."
@.9 = ' '
@.10 = "Frost Robert -----------------------"
do j=1 while @.j\== /*process each of the 10 lines of poem.*/
$= /*nullify the $ string (the new line)*/
do k=1 for words(@.j) /*process each word in a @.j string.*/
$=word(@.j,k) $ /*prepend a word to the new line ($). */
end /*k*/ /* [↑] we could do this another way. */
say $ /*display the newly constructed line. */ end /*j*/ /*stick a fork in it, we're all done. */</lang>
output when using the (internal text) ten lines of input:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
reverse order
This REXX version process the words in reverse order (last to first). <lang rexx>/*REXX program reverses the order of tokens in a string (but not the letters).*/ @.=; @.1 = "---------- Ice and Fire ------------"
@.2 = ' '
@.3 = "fire, in end will world the say Some"
@.4 = "ice. in say Some"
@.5 = "desire of tasted I've what From"
@.6 = "fire. favor who those with hold I"
@.7 = ' '
@.8 = "... elided paragraph last ..."
@.9 = ' '
@.10 = "Frost Robert -----------------------"
do j=1 while @.j\== /*process each of the 10 lines of poem.*/
$= /*nullify the $ string (the new line)*/
do k=words(@.j) to 1 by -1 /*process each word in a @.j string.*/
$=$ word(@.j,k) /*append a word to the new line ($). */
end /*k*/ /* [↑] process last word to first word*/
say $ /*display the newly constructed line. */ end /*j*/ /*stick a fork in it, we're all done. */</lang>
output is the same as the 1st REXX version.
Ring
<lang ring> aList = str2list("
Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert ----------------------- ") aList = str2list(cStr) for x in aList
x2 = substr(x," ",nl) alist2 = str2list(x2) aList2 = reverse(aList2) for y in aList2 see y + " " next see nl
next </lang>
Output <lang ring>
Fire and Ice ----------
Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire.
... last paragraph elided ...
Robert Frost
</lang>
Ruby
<lang ruby>puts <<EOS
Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert ----------------------- EOS
.each_line.map {|line| line.split.reverse.join(' ')}</lang>
Output the same as everyone else's.
Run BASIC
<lang runbasic>for i = 1 to 10
read string$
j = 1
r$ = ""
while word$(string$,j) <> ""
r$ = word$(string$,j) + " " + r$
j = j + 1
WEND
print r$
next end
data "---------- Ice and Fire ------------" data "" data "fire, in end will world the say Some" data "ice. in say Some" data "desire of tasted I've what From" data "fire. favor who those with hold I" data "" data "... elided paragraph last ..." data "" data "Frost Robert -----------------------"</lang> Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I''ve tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Rust
<lang rust>const TEXT: &'static str = "---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------";
fn main() {
println!("{}",
TEXT.lines() // Returns iterator over lines
.map(|line| // Applies closure to each item in iterator (for each line)
line.split_whitespace() // Returns iterator of words
.rev() // Reverses iterator of words
.collect::<Vec<_>>() // Collects words into Vec<&str>
.join(" ")) // Convert vector of words back into line
.collect::<Vec<_>>() // Collect lines into Vec<String>
.join("\n")); // Concatenate lines into String
}</lang>
S-lang
<lang S-lang>variable ln, in =
["---------- Ice and Fire ------------", "fire, in end will world the say Some", "ice. in say Some", "desire of tasted I've what From", "fire. favor who those with hold I", "", "... elided paragraph last ...", "", "Frost Robert -----------------------"];
foreach ln (in) {
ln = strtok(ln, " \t");
array_reverse(ln);
() = printf("%s\n", strjoin(ln, " "));
}</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Scala
<lang Scala>object ReverseWords extends App {
"""| ---------- Ice and Fire ------------
|
| fire, in end will world the say Some
| ice. in say Some
| desire of tasted I've what From
| fire. favor who those with hold I
|
| ... elided paragraph last ...
|
| Frost Robert ----------------------- """
.stripMargin.lines.toList.map{_.split(" ")}.map{_.reverse}
.map(_.mkString(" "))
.foreach{println}
}</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Scheme
<lang Scheme> (for-each
(lambda (s) (print (string-join (reverse (string-split s #/ +/))))) (string-split "---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------" #/[ \r]*\n[ \r]*/))
</lang> Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Seed7
<lang seed7>$ include "seed7_05.s7i";
const array string: lines is [] (
"---------- Ice and Fire ------------", "", "fire, in end will world the say Some", "ice. in say Some", "desire of tasted I've what From", "fire. favor who those with hold I", "", "... elided paragraph last ...", "", "Frost Robert -----------------------");
const proc: main is func
local
var string: line is "";
var array string: words is 0 times "";
var integer: index is 0;
begin
for line range lines do
words := split(line, ' ');
for index range length(words) downto 1 do
write(words[index] <& " ");
end for;
writeln;
end for;
end func;</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Sidef
<lang ruby>DATA.each{|line| line.words.reverse.join(" ").say};
__DATA__
Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------</lang>
Smalltalk
<lang smalltalk> poem := '---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted Ive what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------'.
(poem lines collect: [ :line | ((line splitOn: ' ') reverse) joinUsing: ' ' ]) joinUsing: (String cr). </lang>
- Output:
'------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I''ve tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost'
Sparkling
This only considers space as the word separator, not tabs, form feeds or any other sort of whitespace. (This, however, turns out not to be an issue with the example input.)
<lang sparkling>let lines = split("---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------", "\n");
foreach(lines, function(idx, line) { let words = split(line, " "); let reverseWords = map(words, function(idx) { return words[sizeof words - idx - 1]; }); foreach(reverseWords, function(idx, word) { printf("%s ", word); });
print(); });</lang>
Swift
<lang swift>import Foundation
// convenience extension for better clarity extension String {
var lines: [String] {
get {
return self.componentsSeparatedByCharactersInSet(NSCharacterSet.newlineCharacterSet())
}
}
var words: [String] {
get {
return self.componentsSeparatedByCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
}
}
}
let input = "---------- Ice and Fire ------------\n\nfire, in end will world the say Some\nice. in say Some\ndesire of tasted I've what From\nfire. favor who those with hold I\n\n... elided paragraph last ...\n\nFrost Robert -----------------------\n"
let output = input.lines.map { $0.words.reverse().joinWithSeparator(" ") }.joinWithSeparator("\n")
print(output)</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Tailspin
<lang tailspin> def input: ['---------- Ice and Fire ------------',
,
'fire, in end will world the say Some',
'ice. in say Some',
'desire of tasted Ive what From',
'fire. favor who those with hold I',
,
'... elided paragraph last ...',
,
'Frost Robert -----------------------']
composer words
[ <word>* ] rule word: <~WS> <WS>?
end words
$input... -> '$ -> words -> $(last..first:-1)...; ' -> !OUT::write </lang>
Tcl
<lang tcl>set lines {
"---------- Ice and Fire ------------" "" "fire, in end will world the say Some" "ice. in say Some" "desire of tasted I've what From" "fire. favor who those with hold I" "" "... elided paragraph last ..." "" "Frost Robert -----------------------"
} foreach line $lines {
puts [join [lreverse [regexp -all -inline {\S+} $line]]]
# This would also work for data this simple:
### puts [lreverse $line]
}</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Alternatively…
<lang tcl>puts [join [lmap line $lines {lreverse $line}] "\n"]</lang>
TXR
Run from command line: <lang bash>txr reverse.txr verse.txt</lang> Solution: <lang txr>@(collect) @ (some) @(coll)@{words /[^ ]+/}@(end) @ (or) @(bind words nil) @ (end) @(end) @(set words @(mapcar (fun nreverse) words)) @(output) @ (repeat) @(rep)@words @(last)@words@(end) @ (end) @(end) </lang> New line should be present after the last @(end) terminating vertical definition. i.e. <lang txr>@(end) [EOF]</lang> not <lang txr>@(end)[EOF]</lang>
UNIX Shell
<lang bash>while read -a words; do
for ((i=${#words[@]}-1; i>=0; i--)); do
printf "%s " "${words[i]}"
done
echo
done << END
Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert ----------------------- END</lang>
Same as above, except change <lang bash>read -a</lang> to <lang bash>read -A</lang>
VBA
<lang vb> Option Explicit
Sub Main() Dim Lines(9) As String, i&
'Input
Lines(0) = "------------- Ice And Fire -------------"
Lines(1) = ""
Lines(2) = "fire, in end will world the say Some"
Lines(3) = "ice. in say Some"
Lines(4) = "desire of tasted I've what From"
Lines(5) = "fire. favor who those with hold I"
Lines(6) = ""
Lines(7) = "... elided paragraph last ..."
Lines(8) = ""
Lines(9) = "Frost Robert -----------------------"
'Output
For i = 0 To 9
Debug.Print ReverseLine(Lines(i), " ")
Next
End Sub
Private Function ReverseLine(Line As String, Optional Separat As String) As String Dim T, R, i&, j&, deb&, fin&
If Len(Line) = 0 Then
ReverseLine = vbNullString
Else
If Separat = "" Then Separat = " "
T = Split(Line, Separat)
ReDim R(UBound(T)): j = LBound(T)
deb = UBound(T): fin = deb / 2
For i = deb To fin Step -1
R(j) = T(i)
R(i) = T(j)
j = j + 1
Next i
ReverseLine = Join(R, Separat)
End If
End Function</lang>
- Output:
------------- Fire And Ice ------------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
VBScript
<lang vb> Option Explicit
Dim objFSO, objInFile, objOutFile Dim srcDir, line
Set objFSO = CreateObject("Scripting.FileSystemObject")
srcDir = objFSO.GetParentFolderName(WScript.ScriptFullName) & "\"
Set objInFile = objFSO.OpenTextFile(srcDir & "In.txt",1,False,0)
Set objOutFile = objFSO.OpenTextFile(srcDir & "Out.txt",2,True,0)
Do Until objInFile.AtEndOfStream line = objInFile.ReadLine If line = "" Then objOutFile.WriteLine "" Else objOutFile.WriteLine Reverse_String(line) End If Loop
Function Reverse_String(s) Dim arr, i arr = Split(s," ") For i = UBound(arr) To LBound(arr) Step -1 If arr(i) <> "" Then If i = UBound(arr) Then Reverse_String = Reverse_String & arr(i) Else Reverse_String = Reverse_String & " " & arr(i) End If End If Next End Function
objInFile.Close objOutFile.Close Set objFSO = Nothing </lang>
- Output:
Output written to a file.
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
Yabasic
<lang Yabasic>data " ---------- Ice and Fire ------------ " data " " data " fire, in end will world the say Some " data " ice. in say Some " data " desire of tasted I've what From " data " fire. favor who those with hold I " data " " data " ... elided paragraph last ... " data " " data " Frost Robert ----------------------- " data ""
dim w$(1)
do
read l$
if l$ <> "" then
n = token(l$, w$(), " ")
for i = n to 1 step -1
print w$(i), " ";
next
print
else
break
end if
loop</lang>
zkl
<lang zkl>text:=Data(0,String,
- <<<
"---------- Ice and Fire ------------
fire, in end will world the say Some ice. in say Some desire of tasted I've what From fire. favor who those with hold I
... elided paragraph last ...
Frost Robert -----------------------");
- <<<
text.pump(11,Data,fcn(s){ // process stripped lines
s.split(" ").reverse().concat(" ") + "\n" })
.text.print();</lang>
- Output:
------------ Fire and Ice ---------- Some say the world will end in fire, Some say in ice. From what I've tasted of desire I hold with those who favor fire. ... last paragraph elided ... ----------------------- Robert Frost
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