c++ - 如何在 C++ 中添加一组整数

Question

我对使用 C++ 进行编程还很陌生，我想了解我在这段代码中遗漏了算法流程的地方。该代码应该计算一组门票的费用(25 美元、30 美元、15 美元)。当我运行代码时，它会添加购买的门票总数，而不是所有门票的总费用。我相信我已经正确分配了变量，但我不知道为什么它没有将总成本加在一起，除非我需要单独分配这些变量。

任何帮助将不胜感激，谢谢!

using namespace std; 

int main()

{
//declare variables
double orchestra = 25;
double mainFloor = 30;
double balcony = 15;
double totalSales = 0.0;

//enter input items
cout << "Enter orchestra tickets ";
cin >> orchestra;
cout << "Enter main floor tickets ";
cin >> mainFloor;
cout << "Enter balcony tickets ";
cin >> balcony;

//add the input items and print the total
totalSales = orchestra + mainFloor + balcony;


//display the total sales
cout << "Total Sales $" << totalSales << endl;

system("pause");
return 0;
}   //end of main function 

Answer 1

正如另一条评论中指出的那样，没有任何解释。

您将成本分配给用于输入门票数量的同一个变量(并因此覆盖成本)。相反，将成本放在单独的变量中(如果您愿意，也可以是常量)，然后在获得用户输入后进行计算。

试试这个:

using namespace std; 

int main()
{
    //declare variables
    double cost_per_orchestra = 25;
    double cost_per_mainFloor = 30;
    double cost_per_balcony = 15;
    double orchestra = 0;
    double mainFloor = 0;
    double balcony = 0;
    double totalSales = 0.0;

    //enter input items
    cout << "Enter orchestra tickets ";
    cin >> orchestra;
    cout << "Enter main floor tickets ";
    cin >> mainFloor;
    cout << "Enter balcony tickets ";
    cin >> balcony;

    //add the input items and print the total
    totalSales = cost_per_orchestra * orchestra + cost_per_mainFloor * mainFloor + cost_per_balcony * balcony;


    //display the total sales
    cout << "Total Sales $" << totalSales << endl;

    system("pause");
    return 0;
}   //end of main function