程序代码：

#include<stdio.h>
int main()
{
    int x,y;
    printf("请输入x：\n");
    scanf("%d",&x);
    if(x<0) y=-1;
    else if(x==0) y=0;
    else y=1;
    printf("x=%d,y=%d",x,y);

    return 0;
}

警告    1    warning C4996: 'scanf': This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.