#include <stdio.h>
int main(){
    int n;
    scanf("&d",&n);
            if (n>0){printf("sign(%d)=1",n);
    }else    if(n<0){printf("sign(%d)=-1",n);}
    else if(n==0){printf("sign(%d)=0",n);
    }
}
不管输入什么显示都是sign(0)=0