#include <stdio.h>

int main(int argc, char *argv[])
{ 
    int a = 4, b = 8, *p;
  
    p = &a;          // Now *p is an alias for a
    *p = *p + 100;   // ≡ a = a + 100

    printf("a = %d, b = %d\n", a, b);

    p = &b;          // Now *p is an alias for b
    *p = *p + 200;   // ≡ b = b + 200

    printf("a = %d, b = %d\n", a, b);
}