pass那个题是这样的吧:
#include <stdio.h>
void pass(){
    int y;
    int *adr = &y;
    adr += 12;
    *adr = 456;
}
int main() {
    int x = 123;
    printf("%d \n", x);
    pass();
    printf("%d \n", x);
    return 0;
}