Question

我想在折扣价格计算器中选择我为了启动程序而乐趣，并且想知道我是如何最佳地去做的。我希望它能说出类似的话：“你想再输入另一个价格吗？”如果用户说“是”或“是”或“否”等，请重新启动程序或退出。我应该使用if循环吗？有人可以告诉我如何实现它吗？还是指出我正确的方向？我也觉得我应该重新编写程序以获得方法，但我不熟悉C＃。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Figure_the_Discount
{
class Program
{
    static void Main(string[] args)
    {
        string price, discount;
        decimal discountedPrice, savedAmount;

        //Receiving the price as input
        Console.WriteLine("Please enter the price of the item.");
        price = Console.ReadLine();
        decimal numPrice = decimal.Parse(price);

        //Receiving the discount as input
        Console.WriteLine("Please enter the discount that you wish to apply");
        discount = Console.ReadLine();
        //Receiving discount from input, divide by 100 to convert to percentile
        decimal numDiscount = decimal.Parse(discount) / 100;

        //Calculate the discounted price with price - (price * discount)
        discountedPrice = numPrice - (numPrice * numDiscount);
        //Calculate the amount of money they saved
        savedAmount = numPrice - discountedPrice;
        Console.WriteLine("The discounted price of this item is: ${0}\nYou saved: ${1}", discountedPrice, savedAmount);
        Console.ReadLine();

    }
}
}

Answer 1

只要用户在程序结束时指定y或yes（不区分大小写），以下循环就会循环显示。

static void Main(string[] args)
{
    string price, discount;
    decimal discountedPrice, savedAmount;
    bool startAgain = true;
    string line;

    // Loop again every time the startAgain flag is true.
    while (startAgain)
    {
        //Receiving the price as input
        Console.WriteLine("Please enter the price of the item.");
        price = Console.ReadLine();
        decimal numPrice = decimal.Parse(price);

        //Receiving the discount as input
        Console.WriteLine("Please enter the discount that you wish to apply");
        discount = Console.ReadLine();
        //Receiving discount from input, divide by 100 to convert to percentile
        decimal numDiscount = decimal.Parse(discount) / 100;

        //Calculate the discounted price with price - (price * discount)
        discountedPrice = numPrice - (numPrice * numDiscount);
        //Calculate the amount of money they saved
        savedAmount = numPrice - discountedPrice;
        Console.WriteLine("The discounted price of this item is: ${0}\nYou saved: ${1}", discountedPrice, savedAmount);
        Console.ReadLine();

        // Ask if the user wants to submit another price.
        Console.WriteLine("Would you like to enter another price?");
        // Record the spaceless, lower-case answer.
        line = Console.ReadLine().ToLowerCase().Trim();
        // Set the startAgain flag to true only if the line was "y" or "yes".
        startAgain = line == "y" || line == "yes";
    }
}

Answer 2

你可以这样做：

static void Main(string[] args)
{
    string resp = "";
    string price, discount;
    decimal discountedPrice, savedAmount;
    do {
        .... // your previous code here
        ....
        Console.WriteLine("The discounted price of this item is: ${0}\nYou saved: ${1}", discountedPrice, savedAmount);
        Console.WriteLine("Another item?");
        string resp = Console.ReadLine().ToLower();
    }
    while (resp == "y" || resp == "yes");
    Console.ReadLine();
}

Answer 3

粗略的样本

string input = null;
do {


    //your code 

    Console.WriteLine("Would you like to insert another price?");
    input = Console.ReadLine();
    if(input.ToLower() != "y" ||  //if responce to the question is not 'y' or 'yes', break the loop
         input.ToLower() != "yes")
    break;

}while(true);

编辑

此程序会插入一个价格，直到用户确认他要插入新价格，否则只需退出。

如何在控制台应用程序中实现简单的基于文本的菜单？

3 个答案: