Swap two integers in 'C' programming Without using third variable

#cprogram #c #clanguage #swap

C program to swap two integers without using third variable

Top comments (4)

Frank Puffer • Dec 17 '18 • Edited

While it does have some educational value to show that this is possible, this method has two issues:

Both a = a + b and a = a - b can cause an overflow.
I can't imagine many situations where saving a few bytes really makes up for the loss in readability.

Günther Jena • Dec 30 '18 • Edited

It also works with XOR (avoiding the overflow problem):

a = a ^ b
b = a ^ b
a = a ^ b

Jason C. McDonald • Feb 8 '19

Agreed, this is definitely the way to do it.

Joe Carnuccio • Feb 6 '19 • Edited

reduced to one line:

a ^= b ^= a ^= b;

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