int main(){int a,b;printf("请输入一个三位数:");scanf("%d", &a); a = a / 100;b = (int)(a);a = a * 10;int c = (int)(a), d = c - (b * 10), e = a * 10 - (d * 10) - (b * 100);printf("这个三位数顺序颠倒为:%d%d%d\n", e, d, b);}改成这样试试喽