#include <stdio.h>

int main(int argc, char** argv) {
  int x = 1;
  int* y = &x;
  printf("x = %d\n", x);
  printf("y = %p\n", y);
  *y = 2;
  printf("x = %d\n", x);
  printf("*y = %d\n", *y);
}