// error
#include <stdio.h>

int main() {
    int age=22;
    int _age=23;
    int *ptr = &age;
    int *_ptr= &_age;
    
    printf("difference,%u - %u = %u\n",ptr,_ptr,(ptr)-(_ptr));
    _ptr = &age;
    printf("comparison = %u\n",ptr == _ptr);
    return 0;
}