How to switch two int with out third int

Question

a=20 b=30 run a=30 b=20

Answer 1

a = a + b;
b = a - b;
a = a - b;

Answer 2

a = (b = b ^ (a = a ^ b)) ^ a;

Answer 3

Sorry, I fixed that. Here is a simpler version:

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

Answer 4

thanks so much 😍😍😍😍

Answer 5

sorry Tamas barta your program is wrong 😶😶😶