Question

Ai在这里是新手，也是编程新手。对不起，如果这个问题真的很幼稚，但我在一个简单的c＃程序中使用返回类型时遇到了一些麻烦。这是我的代码文件，在AccountTest类的d == 2，我希望提取过程重新开始，但这次没有要求用户输入帐户余额。朋友建议使用while循环，但我不知道如何在这里使用while循环。提前致谢。：）

using System;

public class Account
{
    public static void Main(string[] args)
    {
        Console.Write("Enter your account balance: ");
        int AccountBalance = Convert.ToInt32(Console.ReadLine());

        Account.Debit(AccountBalance);
    }

    public static void Debit(int AccountBalance)
    {

        Console.Write("\n\nEnter the amount you want to withdraw in Rs: ");
        int WithdrawalAmount = Convert.ToInt32(Console.ReadLine());

        AccountTest.DebitTest(AccountBalance, WithdrawalAmount);
    }
}

我的帐户类

public class AccountTest
{
    public static int DebitTest(int AccountBalance, int WithdrawalAmount)
    {
        if (WithdrawalAmount > AccountBalance)
        {
            Console.WriteLine("\n\nDebit amount exceeded account balance.");
            Console.ReadLine();
            return 0;
        }
        else if (WithdrawalAmount <= 0)
        {
            Console.WriteLine("\n\nError. Incorrect amount.");
            Console.ReadLine();
            return 0;
        }
        else
        {
            int newBalance = AccountBalance - WithdrawalAmount;
            Console.WriteLine("\n\nWithdrawal was successful. Thankyou for using our services.\n\nPress 1 to exit, 2 to withdraw again, 3 to check your account balance.\n");
            int InputNumber = Convert.ToInt32(Console.ReadLine());

            if (InputNumber == 1)
            {
                Console.ReadLine();
                return 0;
            }

            else if (InputNumber == 2)
            {

                return WithdrawalAmount;
            }

            else if (InputNumber == 3)
            {
                Console.WriteLine("\n\nYour remaining account balance is: {0}", newBalance);
                Console.ReadLine();
                return 0;
            }
        }
        return 0;
    }
}

Answer 1

真的应该重构代码。处理像thing这样的帐户更有意义，因为它应该是它自己的对象，你应该告诉它该怎么做：

 public class Account
 {
    public int Balance { get; set; }

    public Account(int startBalance)
    {
        Balance = startBalance;
    }

    public void Debit(int amount) { Balance -= amount; }
    public void Credit(int amount) { Balance += amount; }
 }

现在，您可以询问用户他们想要对自己的帐户执行的操作，并且您还可以添加多个帐户。所以该程序可能如下所示：

int startingAmount = int.Parse(Console.ReadLine());
var account = new Account(startingAmount);

Console.WriteLine("1 to credit, 2 to debit, 0 to exit");
var input = int.Parse(Console.ReadLine());
while (input != 0)
{
   //manipulate account         
}

我首先阅读静态vs实例对象

Answer 2

首先，欢迎来到编码社区，没有幼稚的问题随时可以随意询问，有些人会用“谷歌有答案”回答你，但不用担心很多其他人会帮助你，我看到你已经选择了一个答案，但生病了，为你和其他新程序员添加了我的观点。

一个。如果您的新编码永远不会从代码开始，它只会使事情变得复杂，而是从流程图开始，说明您从程序和每个组件（类，函数等）中获得的内容后，它更容易要将其转换为代码，您可以尝试使用this site 它似乎非常用户友好，并将以正确的格式绘制流程图。

湾就像我这里所说的人从来没有像a，b，c那样使用变量，因为第二天你会试着继续你离开的地方，你会忘记你的意思。

℃。试着想办法使用代码来防止重复自己。

d。使用硬编码值是不好的做法（硬编码意味着：

return "this value to return is hard coded and will never change";

）

当我回答你的问题时，我已经看到了@Jonesy的答案，这是正确的，喜欢什么我想建议如此生病，留下你的答案。

希望这有助于某人:)

Answer 3

循环可以在借记方法中实现：

public static void Debit(int AccountBalance)
{
    int result = 0;
    do
    {
        Console.Write("\n\nEnter the amount you want to withdraw in Rs: ");
        var WithdrawalAmount = Convert.ToInt32(Console.ReadLine());

        result = AccountTest.DebitTest(AccountBalance, WithdrawalAmount);

    } while (result != 0);
}

Answer 4

你应该阅读while循环。基本上你想要的是返回一个数字的方法，该数字决定了程序下一步应该做什么，或者应该什么时候结束。将循环视为您的引擎状态＆＃34;只要没有按下[选择的键]，就继续做某事＆＃34;。

一个小例子，[selected key]为1，将是：

int choice = 0;
int balance = 100;
while (choice != 1) {
    Console.WriteLine("Enter withdraw amount");
    string userInput = Console.ReadLine();

    // This will crash the program if the user enters text.
    // Used for demonstration only. int.TryParse is preferred.
    int value = int.Parse(userInput);

    choice = AccountTest.DebitTest(balance, value);
}

class AccountTest {
    public static int DebitTest(int AccountBalance, int WithdrawalAmount)
    {
        // do the test if the debit is OK
        //..........

        // At the end, you can do this. This till return the value entered and 
        // choice will be given a new value. If it was 1, the program will end.
        // NOTE: It's not safe to use convert as                
        // it will crash the program if the user enters text.
        return Convert.ToInt32(Console.ReadLine()); 
    }

}

请注意，这不是一个功能性的ATM程序，因为余额永远不会更新。我留下那个让你解决，因为我猜这是编程中的一个类=）

Answer 5

嗯，这是我的程序版本。我稍微改变了行为（比如当值无效时再次询问）。它并不完美;例如，消息和RequestDebit方法应该在Account类之外处理，可能在AccountHandler类中处理，但对于这个简单的练习，所有这些都可能有点过分。无论如何，我希望你发现它很有用：

public class Account
{
    public int Balance { get; set; }

    public Account(int startingBalance)
    {
        this.Balance = startingBalance;
    }

    private bool Debit(int amount)
    {
        if (amount <= 0)
        {
            Console.WriteLine("\n\nError. Incorrect amount.");
            return false;
        }

        if (amount > this.Balance)
        {
            Console.WriteLine("\n\nDebit amount exceeded account balance.");
            return false;
        }

        this.Balance -= amount;
        Console.WriteLine("\n\nWithdrawal was successful. Thankyou for using our services.");
        return true;
    }

    public void RequestDebit()
    {
        bool success;
        do
        {
            Console.Write("\n\nEnter the amount you want to withdraw in Rs: ");
            int withdrawalAmount = Convert.ToInt32(Console.ReadLine());
            success = this.Debit(withdrawalAmount);
        } while (!success);
    }
}

class Program
{
    static void Main(string[] args)
    {
        int accountBalance;
        do
        {
            Console.Write("Enter your account balance: ");
            accountBalance = Convert.ToInt32(Console.ReadLine());
        } while (accountBalance <= 0);

        var myAccount = new Account(accountBalance);

        myAccount.RequestDebit();

        int inputNumber;
        do
        {
            Console.WriteLine("\n\nPress 1 to exit, 2 to withdraw again, 3 to check your account balance.\n");
            inputNumber = Convert.ToInt32(Console.ReadLine());
            switch (inputNumber)
            {
                case 2: myAccount.RequestDebit();
                    break;
                case 3:
                    Console.WriteLine("\n\nYour remaining account balance is: {0}", myAccount.Balance);
                    break;
            }

        } while (inputNumber != 1);
    }
}

对如何在c＃中使用return感到困惑

5 个答案: