[stack1.c]

#include <stdio.h>
int main(int argc, char const *argv[])
{
    int cookie;
    char buf[16];
    printf("&buf:_%p,_&cookie:_%p\n", buf, &cookie);
    gets(buf);
    if (cookie == 0x41424344)
    {
        printf("You_win!\n");
    }
}