# include <stdio.h>

int main (void)
{
    const int secret_code = 510;
    int enter_code;

    printf ("Please Enter The Code:");
    scanf ("%d", &enter_code);
    do
    {
        printf ("Sorry! Try Again!\n");
        printf ("Please Enter The Code:");
        scanf ("%d", &enter_code);
    }while (secret_code != enter_code);

    printf ("Congratulations!\n");
    return 0;
}


我输入字母d之后 就进行了无限循环。为什么？