#include <stdio.h>

#include <stdlib.h>  // EXIT_SUCCESS



void swap(int a, int b) {

  int tmp = a;

  a = b;

  b = tmp;

}



int main(int argc, char **argv) {

  int a = 42, b = -7;



  swap(a, b);

  printf("a: %d, b: %d\n", a, b);

  return EXIT_SUCCESS;

}