C语言判断输入数正负

#include <stdio.h>#include <stdlib.h>/* run this program using the console pauser or add your own getch, system("pause") or input loop */int main(int argc, char *argv[]) {int shu1,shu2;printf("请输入需要判断的数：");scanf("%d",&shu1);if(shu1>0) {  shu2=1; } else if(shu1==0) { shu2=0; } else if(shu1<0) { shu2=-1; } printf("输出\n-1，则小于0；\n0，则等于0；\n1则大于0；\n输出为：%d",shu2);return 0;}