#include<stdio. h>

int main()

{

    int x,y;

    printf("please input x:");

    scanf("%d",&x);                    //从键盘接收x的值

    if(x<0)                                    //判断x的值，执行相应语句

        y=x+1;

    else

        if(x==0)y=x;

        else y=x-1;

        printf("y=%d\n",y);

        return 0;

}