你的程序里面少了累加和的语句了，我给你加了一句，你再试试。#include int main (){
int x, x1, x2, x3, x4, s=0;
scanf("%d",&x); if(999int main (){
int x, x1, x2, x3, x4, s=0;
scanf("%d",&x); if(999<x<10000) {x1=x/1000;
x2=x%1000/100;
x3=x%1000%100/10;
x4=x%10; s=x1+x2+x3+x4;
if(s%2==0)
printf("Yes\n");
else
printf("No\n"); }
else
printf("Invalid data\n");}你忘了S=x1+x2+x3+x4放在IF前面哦，这事条件哦，呵呵 ··· |
