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

int main(void) {
  int a = 1, b = 2, c = 3, d = 4;
  int *p1 = &a, *p2 = &b, *p3 = &c, *p4 = &d, *p5;

  p5  = p3;
  *p3 = *p2;
  *p2 = *p5;
  *p4 = *p1;
  *p1 = *p4;
  printf("a, b ,c and d are equal to: %d, %d, %d and %d\n", a, b, c, d);
  exit(EXIT_SUCCESS);
}