hdu_1036(取整和格式控制)

题意很简单，求平均时间

复习一下如何取整

(int) fl 是直接向下取整  ==  floor(fl)

向上取整 (int)(fl+1)  == ceil(fl)

四舍五入 (int)(fl+0.5)

技巧：输入时候决定什么时候读入int，什么时候读入char有时候可以省很多事情

代码：

 #include<cstdio>
 #include<cstring>
 #include<algorithm>
 using namespace std;
 int hour, minutes, second;
 bool fl;int t;
 char tm[];
 void solve(){
     if(tm[]=='-'){fl = ; return;}
     hour += tm[]-'';
     minutes = minutes + (tm[]-'')*+(tm[]-'');
     second = second + (tm[]-'')*+(tm[]-'');
 }
 void pout(){
     if(t/==) printf(" ");
     if(t/==) printf(" ");
     printf("%d",t);
     printf(": %d:",minutes);
     if(second/==) printf("");
     printf("%d min/km\n",second);
 }
 int main()
 {
     int n;  double d;
     char tt[];
     while(~scanf("%d%lf",&n,&d))
     {
         while(~scanf("%d",&t)){
             hour = , minutes = ; second = ;
             fl = ;
             for(int i = ; i < n; i++){
                 scanf("%s",&tm);
                 solve();
             }
             if(fl==){
                 if(t/==) printf(" ");
                 if(t/==) printf(" ");
                 printf("%d",t);
                 printf(": -\n");
                 continue;
             }
             double allminutes = hour*+minutes+(double)second/;
             //printf("min = %lf\n",allminutes);
             allminutes /= d;
             minutes = (int)allminutes;
             second =(int)((allminutes-(int)allminutes)*+0.5);
             if(second==){
                 second = ;
                 minutes ++;
             }
             pout();
         }
     }
     return ;
 }