2835: 计算书费

解题思路:

注意事项:

参考代码:

#include<iostream>

#include<iomanip>

using namespace std;

int main()

{     

        float arr1[10]={28.9,32.7 ,45.6,78,35,86.2,27.8,43,56,65};

        float arr2[10],y=0;

        for(int i=0;i<=9;i++){

                cin>>arr2[i];

                y+=arr1[i]*arr2[i];

        }

        printf("%.1f",y);

        return 0;

}