//使用函数计算分段函数的值
#include<stdio.h>
int sign(double x);
int main(int argc,char const *argv[])
{
double x;
printf("输入x:");
scanf("%lf",&x);
printf("f(%.2f)=%d\n",x,sign(x));
return 0;
}
int sign(double x)
{
int f;
if(x>0)
f=1;
else if(x==0)
f=0;
else
f=-1;
return f;
}
