Question

我在做c ++作业。在这个项目中，我需要知道出售股票所得的金额我通过sell_price乘以股票得到了这一点。但是由于某种原因，当我运行代码时，我得到的结果只是我输入的数字作为售价。为什么卖价不会乘以股票数量？提前谢谢。

// ConsoleApplication9.cpp：定义控制台应用程序的入口点。 //

#include "stdafx.h"
#include <iostream>
using namespace std;

int main()
{
    double stocks ;
    double purchase_price ;
    double selling_price ;

    cout << "Enter number of stocks sold:";
    cin >> stocks ;

    cout << "Enter purchase price:";
    cin >> purchase_price ;

    cout << "Enter selling price:";
    cin >> selling_price ;

    double invested = purchase_price * stocks + (purchase_price * 0.015);
    double total_service_charges = ((purchase_price + selling_price)* (.015 * stocks));

    cout << "Total money invested =" << invested << endl;
    cout << "total service charges=" << total_service_charges << endl;
    cout << "Amount received from selling stocks=" << (selling_price*stocks);

        if (purchase_price < selling_price)
        {cout << "Amount gained=" << selling_price - purchase_price;}
        else if (purchase_price > selling_price)
        {
            cout << "Amount lost=" << purchase_price - selling_price;
        }

        else if (purchase_price = selling_price)
        {
            cout << "Amount gained=" << purchase_price - selling_price<< endl;
        }


    return 0;
}

Answer 1

else if (purchase_price = selling_price)

您使用了=（赋值）而不是==（相等比较。）您想要的是：

else if (purchase_price == selling_price)

注意编译器警告。在这种情况下，编译器应该警告您在条件表达式中进行了赋值。

c ++中的变量不会相乘

1 个答案: