这个程序测试一个指针是否可以作为一个变量来存储输入数据。

#include <stdio.h>

int main(void)
{
    int *prt;
    printf("Input prt:");
    scanf("%d", prt);
    printf("What you inputed is: %d\n", *prt);
    return 0;
}

还有测试日志：

Segmentation fault (core dumped)

然后我写了另一个测试：

#include <stdio.h>

int main(void)
{
    int *p;
    int x;
    printf("Input x:");
    scanf("%d", &x);
    p = &x;
    printf("What you inputed is: %d\n", x);
    printf("What you inputed is: %d\n", *p);
    printf("The address of x: %p\n", &x);
    printf("The address p points to: %p\n", p);

    return 0;   
}

还有测试日志：

Input x:10
What you inputed is: 10
What you inputed is: 10
The address of x: 0x7ffc5f2636f4
The address p points to: 0x7ffc5f2636f4

效果很好。所以我很困惑，为什么我不能使用prt的第一个程序来接受输入？