#include <stdio.h>

/**
 * @brief Variable swapping exercide
 */
void swap(int *p, int *q) {
  printf("*p: %d; p = %p\n", *p, p);
  printf("*q: %d; q = %p\n", *q, q);
  int x = *p;
  int y = *q;
  *p = y;
  *q = x;
}

int main() {
  int a, b;
  a = 4;
  b = 5;
  printf("a = %d, b = %d\n", a, b);
  swap(&a, &b);
  printf("a = %d, b = %d", a, b);
}