计算书费(简简单单）

解题思路:

注意事项:

参考代码:

#include<iostream>

#include<iomanip>

using namespace std;

int main()

{

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

int x;

double f=0;

for (int i = 0; i < 10; i++)

{

cin >> x;

f = f+1.0 * x * a[i];

}

cout << fixed << setprecision(1) << f<< endl;

}