C > Miscellaneous

Macro to substitude values etc

Macro to substitude values etc

#include <stdio.h>

#define swap(a, b) a ^= b ^= a ^= b;

int main(void) {
 char one = 'a', two = 'b';

 /* one = a, two = 'b' */
 printf("before : %c %c\n", one, two);

 swap(one, two);

 /* one = 'b', two = a */
 printf("after  : %c %c\n", one, two);

 return 0;
}