#include <stdio.h>
#include <stdlib.h>

void f(int *a, int *b) {
    *a = *a ^ *b;
    *b = *a ^ *b;
    *a = *a ^ *b;
}

int main() {
    int a = 94;
    int b = 247;
    printf("Before swap : a=%d | b=%d\n", a, b);
    f(&a, &b);
    printf("After swap : a=%d | b=%d\n", a, b);
}