Integer comparison
You are encouraged to solve this task according to the task description, using any language you may know.
Basic Data Operation
This is a basic data operation. It represents a fundamental action on a basic data type.
You may see other such operations in the Basic Data Operations category, or:
Integer Operations
Arithmetic |
Comparison
Boolean Operations
Bitwise |
Logical
String Operations
Concatenation |
Interpolation |
Comparison |
Matching
Memory Operations
Pointers & references |
Addresses
Get two integers from the user, and then output if the first one is less, equal or greater than the other. Test the condition for each case separately, so that all three comparison operators are used in the code.
Ada
with Ada.Text_IO; use Ada.Text_IO; with Ada.Integer_Text_IO; use Ada.Integer_Text_Io; procedure Compare_Ints is A, B : Integer; begin Get(Item => A); Get(Item => B); -- Test for equality if A = B then Put_Line("A equals B"); end if; -- Test For Less Than if A < B then Put_Line("A is less than B"); end if; -- Test For Greater Than if A > B then Put_Line("A is greater than B"); end if; end Compare_Ints;
C++
#include <iostream> #include <istream> #include <ostream> int main() { int a, b; std::cin >> a >> b; // test for less-than if (a < b) std::cout << a << " is less than " << b << "\n"; // test for equality if (a == b) std::cout << a << " is equal to " << b << "\n"; // test for greater-than if (a > b) std::cout << a << " is greater than " << b << "\n"; }
Clean
import StdEnv compare a b | a < b = "A is less than B" | a > b = "A is more than B" | a == b = "A equals B" Start world # (console, world) = stdio world (_, a, console) = freadi console (_, b, console) = freadi console = compare a b
Java
import java.io.*; public class compInt { public static void main(String[] args) { try { BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); int nbr1 = Integer.parseInt(in.readLine()); int nbr2 = Integer.parseInt(in.readLine()); if(nbr1<nbr2) System.out.println(nbr1 + " is less than " + nbr2); if(nbr1>nbr2) System.out.println(nbr1 + " is greater than " + nbr2); if(nbr1==nbr2) System.out.println(nbr1 + " is equal to " + nbr2); } catch(IOException e) { } } }
Forth
To keep the example simple, the word takes the two numbers from the stack.
: compare-integers ( a b -- ) 2dup < if ." a is less than b" then 2dup > if ." a is greather than b" then = if ." a is equal to b" then ;
Fortran
program compare integer a, b read(*,*) a, b c c test for less-than if (a .lt. b) then write(*, *) a, ' is less than ', b end if c c test for equality if (a .eq. b) then write(*, *) a, ' is equal to ', b end if c c test for greater-than if (a .gt. b) then write(*, *) a, ' is greater than ', b end if c end
Pascal
program compare(input, output) var a, b: integer; begin if (a < b) then writeln(a, ' is less than ', b); if (a = b) then writeln(a, ' is equal to ', b); if (a > b) then writeln(a, ' is greater than ', b); end.
Perl
Interpreter: Perl 5.x
Seperate tests for less than, greater than, and equals
sub test_num { my $f = shift; my $s = shift; if ($f < $s){ return -1; # returns -1 if $f is less than $s } elsif ($f > $s) { return 1; # returns 1 if $f is greater than $s } elsif ($f == $s) { # = operator is an assignment # == operator is a numeric comparison return 0; # returns 0 $f is equal to $s }; };
All three tests in one. if $f is less than $s return -1, greater than return 1, equal to return 0
sub test_num { return $_[0] <=> $_[1]; };
Note: In Perl, $a and $b are (kind of) reserved identifiers for the built-in sort function. It's good style to use more meaningful names, anyway.
Pop11
;;; Comparison procedure define compare_integers(x, y); if x > y then printf('x is greater than y\n'); elseif x < y then printf('x is less than y\n'); elseif x = y then printf('x equals y\n'); endif; enddefine; ;;; Setup token reader vars itemrep; incharitem(charin) -> itemrep; ;;; Read numbers and call comparison procedure compare_integers(itemrep(), itemrep());
Python
#!/usr/bin/env python a = int(raw_input('Enter value of a: ')) b = int(raw_input('Enter value of b: ')) if a < b: print 'a is less than b' elif a > b: print 'a is greater than b' elif a == b: print 'a is equal to b'
Standard ML
fun compare_integers(a, b) = if a < b then print "A is less than B\n" else if a > b then print "A is greater than B\n" else print "A equals B\n"
fun test () = let open TextIO val SOME a = Int.fromString (input stdIn) val SOME b = Int.fromString (input stdIn) in compare_integers (a, b) end handle Bind => print "Invalid number entered!\n"
Tcl
This is not how one would write this in Tcl, but for the sake of clarity:
puts "Please enter two numbers:" gets stdin x gets stdin y if { $x > $y } { puts "$x is greater than $y" } if { $x < $y } { puts "$x is less than $y" } if { $x == $y } { puts "$x equals $y" }
Other comparison operators are "<=", ">=" and "!=".
Note that Tcl doesn't really have a notion of a variable "type" - all variables are just strings of bytes and notions like "integer" only ever enter at interpretation time. Thus the above code will work correctly for "5" and "6", but "5" and "5.5" will also be compared correctly. It will not be an error to enter "hello" for one of the numbers ("hello" is greater than any integer). If this is a problem, the type can be expressly cast
if { [int $x] > [int $y] } { puts "$x is greater than $y" }
or otherwise type can be checked with "if { string is integer $x }..."
Note that there is no substitution/evaluation here anywhere: entering "3*5" and "15" will parse "3*5" as a non-numerical string (like "hello") and thus the result will be "3*5 is greater than 15".
Toka
[ ( a b -- ) 2dup < [ ." a is less than b\n" ] ifTrue 2dup > [ ." a is greater than b\n" ] ifTrue = [ ." a is equal to b\n" ] ifTrue ] is compare-integers 1 1 compare-integers 2 1 compare-integers 1 2 compare-integers