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c++ - 我需要为学校项目找出简单的循环

问题描述

我们应该做一个零售收银员，但我根本无法弄清楚循环。到目前为止，我们只学习了简单的选择和重复语句，我知道这就是我所需要的，但我似乎无法弄清楚。

项目概况

入门代码：

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    double cashDrawer = 500.00;
    int productID = 0;
      int quantity = 0;
    double price = 0.0;
    double subtotal = 0.0;
    double salesTax = 0.0;
    double totalSale = 0.0;
    int anotherSale = 1;

    // Loop for repeat sales



    // Enter the first Product ID for the first sale (-1 to exit)



    // Main loop for each sale



    // Switch statement to determine the price, and calculate sales tax, if any, for the item.



    // Get next Product ID



    // Print properly formatted output for each sale



      // Another sale?



    // Display how much is in the cash drawer at the end


}

到目前为止我所拥有的：

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    double cashDrawer = 500.00;
    int productID = 0;
    int quantity = 0;
    double price = 0.0;
    double subTotal = 0.0; // for receipt purposes
    double salesTax = 0.0; // for receipt purposes
    double totalSale = 0.0; // for receipt purposes
    int anotherSale = 1;
    double taxRate = 0.075; // default tax rate

    // Loop for repeat sales
    while ()
    {
        
    
    


    // Enter the first Product ID for the first sale (-1 to exit)
    cout << "Enter the first Product ID: ";
    cin >> productID;


    // Main loop for each sale
    while (productID > 0) 
    {


        // Switch statement to determine the price, and calculate sales tax, if any, for the item.
        switch (productID) 
        {
        case 101:
            price = 65.00;
            taxRate = 0.075;
            break;
        case 102:
            price = 12.50;
            taxRate = 0;
            break;
        case 103:
            price = 24.50;
            taxRate = 0.00;
            break;
        case 104:
            price = 38.75;
            taxRate = 0.075;
            break;
        case 105:
            price = 17.80;
            taxRate = 0.075;
            break;
        case 106:
            price = 16.50;
            taxRate = 0;
            break;
        case 107:
            price = 42.85;
            taxRate = 0.075;
            break;
        case 108:
            price = 32.99;
            taxRate = 0.075;
            break;
        case 109:
            price = 28.75;
            taxRate = 0.075;
            break;
        case 110:
            price = 51.55;
            taxRate = 0;
            break;
        default:
            cout << "INVALID PRODUCT ID: Product ID not found." << endl;
        }

        cout << "Enter the quantity: ";
        cin >> quantity;

        subTotal += price * quantity;
        salesTax += price * quantity * taxRate;
        totalSale = subTotal + salesTax;
        
        // Get next Product ID
        cout << "Enter the next Product ID: ";
        cin >> productID;
    }

    // Print properly formatted output for each sale



    // Another sale?


    }
    // Display how much is in the cash drawer at the end


}

任何帮助表示赞赏，提前谢谢你们。

标签： c++project

解决方案

循环语句的基本方面是重复相同的指令集，直到满足指定的条件。您已经成功地找出了您正在检查的代码的内部循环if productID>0。您需要对外部循环执行相同的操作，并对anotherSaleie施加类似的条件while(anotherSale!=0)。每次内循环完成时，只需询问用户的值anotherSale; 如果用户输入 0，则循环应该中断。

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