Swapping without using temporary variable in C - XOR

swap_xor.c

/**
  * Swapping without using a temporary variable in C 
  * (XOR)
  **/

#include<stdio.h>

int main(void)
{
  int a = 5; /* a = 0101 */
  int b = 10; /* b = 1010 */

  printf("Initially, a = %d and b = %d\n", a, b);

  a = a ^ b; /* a = 0101 XOR 1010 = 1111 */
  b = a ^ b; /* b = 1111 XOR 1010 = 0101 */
  a = a ^ b; /* a = 1111 XOR 0101 = 1010 */

  printf("After swapping, a = %d and b = %d\n", a, b);

  return 0;
}