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Challenges

Small integer swapping

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In this simple challenge, create a short program that takes 2 ints as input, output them, swap their places, then output them again. Those 2 integers can't be the same number. The program with the shortest solution wins! Loopholes are banned in this challenge.

An example C program for the challenge (mostly ungolfed):

#include <stdio.h>

int main() {
	int x, y;
	scanf("%i %i", &x, &y);
	printf("%i %i", x, y);
	int z = x;
	x = y;
	y = z;
	printf("%i %i", x, y);
}

You can make 2 answers in one post: 1 with output swapping, and 1 with variable swapping.

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1 comment thread

How is the mentioned loophole a loophole? (6 comments)

7 answers

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J, 3 bytes

,|.

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This hook y f (g y) appends y with its reverse.

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Japt, 3 bytes

I/O as an array.

cUé

Try it

cUé     :Implicit input of array U
c       :Concatenate
 Ué     :  U rotated right once
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I removed the "loophole". (1 comment)
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Vyxal o, 5 bytes

~$","

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I'd say this counts, because $ is quite literally "swap the top two items on the stack".

Explained

~$","
~$    # Swap the top two items, but peek instead of pop
  ",  # pair and output
    " # pair what remains and output with the `o` flag

But if variables are absolutely needed:

Vyxal o, 29 bytes

→x→y",←y→temp←x→y←temp→x←y←x"

Try it Online!

Explained

→x→y",←y→temp←x→y←temp→x←y←x"
→x→y                          # put the two inputs into x and y
    ",                        # print [y, x]
      ←y→temp                 # temp = y
             ←x→y             # y = x
                 ←temp→x      # x = temp
                        ←y←x" # print [y, x] (now swapped)
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I removed the "loophole". (1 comment)
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Python 3.8 (pre-release), 39 bytes

print(x:=input(),y:=input())
print(y,x)

Try it online!

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APL (Dyalog Extended), 3 bytes

⊢⍮⌽

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 the argument

 paired up with

 its reverse

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I removed the "loophole". (1 comment)
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C (clang), 63 bytes

x,y;main(){scanf("%i%i",&x,&y);printf("%i %i\n%i %i",x,y,y,x);}

Try it online!

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Ruby, 24 bytes

gets=~/ /;puts$`,$'*2+$`

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