这道题是什么回事，能写一下吗

Question

Answer 1

图片太模糊了，大体代码如下：

#include <stdio.h>

int main()
{
    int f,x,a;
    scanf("%d",&x);
    if(x<0)
        a = -1;
    else if(x == 0)
        a = 0;
    else
        a = 1;
    switch(a)
    {
    case -1:
        f = -1;
        break;
    case 0:
        f = 0;
        break;
    case 1:
        f = 2;
        break;
    }
    printf("%d",f);
    return 0;
}