void up_and_down(int);

int main(int argc, const char * argv[]) {

    up_and_down(1);

    return 0;

}

void up_and_down(int n)

{

    printf("Level %d, %p\n",n,&n);

    if (n < 4) {

        up_and_down(n + 1);

    }

    printf("Level %d, %p\n",n,&n);

}

问：会输出什么？:lol不要编译，凭直觉答

void up_and_down(int);

int main(int argc, const char * argv[]) {

    up_and_down(1);

    return 0;

}

void up_and_down(int n)

{

    printf("Level %d, %p\n",n,&n);

    if (n < 4) {

        up_and_down(n + 1);

    }

    printf("Level %d, %p\n",n,&n);

}

问：会输出什么？:lol不要编译，凭直觉答