实现符号函数sign(x)

#include <stdio.h>

int sign( int x );

int main()
{
    int x;

    scanf("%d", &x);
    printf("sign(%d) = %d\n", x, sign(x));

    return 0;
}
int sign( int x )
{
    if(x > 0) return 1;
    if(x == 0)return 0;
    if(x < 0)return -1;
}