如果條件為真，如何在while循環中重復代碼行c#

Question

我需要有關以下代碼的 while 循環的幫助：

using System;

namespace Sample
{
    class Program
    {
        static int Main(string[] args)
        {
            int num1;
            int num2;
            //This collects the price as input from the user
            Console.Write("Enter Price: ");
            num1 = Convert.ToInt32(Console.ReadLine());
            //This collects the amount paid as input from the user
            Console.Write("Paid: ");
            num2 = Convert.ToInt32(Console.ReadLine());
            decimal price = num2 - num1;
            Console.WriteLine("{0} - {1} = {2}", num2, num1, num2 - num1);
            while (num2 < num1)
            {
                Console.WriteLine("You have paid less than the price");
                Console.WriteLine("\nPlease pay an amount equals to/greater than "+num1);
                num2 = Convert.ToInt32(Console.ReadLine());
            }
            return num2 = Convert.ToInt32(Console.ReadLine());
        }
    }
}

我希望代碼顯示消息並再次詢問用戶輸入 'Console.Write("Paid:");' 如果支付的金額低於價格。 當前代碼只會顯示消息，不會提示用戶再次輸入價格。 你能幫忙解決這個問題嗎

Answer 1

那是因為您希望用戶立即支付價格/高於價格。 看看這段代碼：

static void Main(string[] args)
    {
        int price;
        int paid;
        //This collects the price as input from the user
        Console.Write("Enter Price: ");
        price = Convert.ToInt32(Console.ReadLine());
        //This collects the amount paid as input from the user
        Console.Write("Paid: ");
        paid = Convert.ToInt32(Console.ReadLine());
        decimal change = paid - price;
        Console.WriteLine("{0} - {1} = {2}", paid, price, change);
        while (paid < price)
        {
            Console.WriteLine("You have paid less than the price");
            Console.WriteLine("\nPlease pay an amount equals to/greater than " + price);
            paid += Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("You have paid:" +paid);
        }

        Console.WriteLine("You have paid enough, the price was {0} and you paid {1}", price, paid);
    }

我已經更改了變量名稱，使其更清楚發生了什么。 使用此代碼，您將新輸入添加到上次輸入中，因此最終變量 'paid' 將大於變量 'price'，從而在達到所需金額后結束程序。