hdoj 1170 ballon Comes!(水)

思路：注意下四舍五入就好

代码如下：

#include <iostream>  #include <stdio.h>#include <stdlib.h>#include <string.h>#include <math.h>#include <algorithm>#include <vector>using namespace std;int main(){int t;int a,b;char c;double r;scanf("%d%*c",&t);while(t--){scanf("%c %d %d%*c",&c,&a,&b);if(c=='+')printf("%d\n",a+b);if(c=='-')printf("%d\n",a-b);if(c=='*')printf("%d\n",a*b);if(c=='/'){r=(double)a/(double)b;if((int)(r*10000)==(int)r*10000)printf("%d\n",(int)r);elseprintf("%.2lf\n",r);}}                return 0;        }