使用函数计算分段函数的值

#include<stdio.h>int sign(int x){int z;if(x>0)z=1;if(x==0)z=0;if(x<0)z=-1;return z;}int main(){int n,a;scanf("%d",&n);a=sign(n);printf("sign(%d) = %d",n,a);return 0;}