#include <stdio.h>


void swap(int **x, int **y) {

  int* t = *x;
  *x = *y;
  *y = t;
}

   
int main(){
  

  int i= 1;
  int j= 2;

  int* pi;
  pi= &i;

  int* pj;
  pj= &j;

  printf("i: %i j: %i\n", *pi, *pj);

  swap(&pi, &pj);

  printf("i: %i j: %i\n", *pi, *pj);
}