算菜价

 1 #include <stdio.h>
 2 #include <math.h>
 3 
 4 int main(){
 5     double amount;
 6     double price;
 7     double sum;
 8     char s[20];
 9     
10     sum=0;
11     while((scanf("%s%lf%lf",s,&amount,&price))!=EOF){
12         sum+=(amount*price);
13     }
14     
15     sum=floor(sum*10+0.5);
16     
17     printf("%.1lf\n",sum/10);
18     
19     
20                 
21     return 0;
22 }