swappiness

#include <stdio.h>

void swappiness(int a, int b, int * c, int * d) {
  int * e = c;
  c = d;
  d = e;
  int f = a;
  a = b;
  b = f;
  f = a;
  a = b;
  b = f;
}

int main(void) {
  int a = 10, b = 20;
  swappiness(a, b, &b, &a);
  printf("%d %d\n", a, b);

  return 0;
}