如何在并行数组 C# 的 bool 方法中返回 true 或 false 消息？

Question

注：我正在学习使用arrays。

我的并行数组的 bool 方法的问题是我想返回 true 或 false，并显示余额为空（等于 double 数据类型中的 0.00）或不为空（返回 false）的消息。 运行这段代码后我得到了结果：

• 余额不为空 False
• 余额不为空 False
• 余额不为空 False

简而言之，一旦我运行这些代码，它就会循环或者不会读取用户的余额是否为空，因为它不会检查它是零还是小于零。 相反，他们只是忽略它然后返回一个错误。

这是我的代码：

// declaring three parallel arrays that store name, account number, and balance with data types
string [] customerName = new string [2];
int [] bankAccount = new int [2];
double [] balance = new double [2];

customerName = new string [] { "John Doe", "Jane Doe", "John Smith" };
bankAccount = new int [] { 123456 , 654321 , 987654 };
balance = new double [] {100.00, 200.00, 300.00};

for ( int i = 0; i < customerName.Length; i++)
{
    Console.WriteLine(customerName[i] + "\t" + "Account Number: " + bankAccount[i] + "\t" + "Balance: $" + balance[i]);
}

// declared three different balances for the deposit method since context is necessary for local variables
double balance1 = balance[0];
double balance2 = balance[1];
double balance3 = balance[2];

Console.WriteLine(isEmpty(balance1));
Console.WriteLine(isEmpty(balance2));
Console.WriteLine(isEmpty(balance3));

 bool isEmpty (double balance)
{
    bool balance1 = balance == 0;
    bool balance2 = balance == 0;
    bool balance3 = balance == 0;
    if (balance == 0)
    {
        return true;
    }
    else
    {
        Console.WriteLine("The balance is not empty");
    }
    return balance1 || balance2 || balance3;
}

// hardcoded values for three customers' balances to be updated
double deposit = 200.00;
double deposit1 = 300.00;
double deposit2 = 400.00;

// declared three different customers' names for return with string data type
string firstCustomer = "John Doe";
string secondCustomer = "Jane Doe";
string thirdCustomer = "John Smith";

Console.WriteLine(Deposit(firstCustomer, balance1, deposit));
Console.WriteLine(Deposit(secondCustomer, balance2, deposit1));
Console.WriteLine(Deposit(thirdCustomer, balance3, deposit2));

// string return that will return the three customers with updated balance after the deposit which is string
string Deposit (string customerName, double balance, double deposit)
{
    double newBalance = balance + deposit;
    return customerName + " deposited $" + deposit + " and the new balance is " + newBalance;
}

因此，我需要简单地检查并在确定余额是否为空后返回 false 或 true。 没有错误，只是显示一些重复并忽略返回 false 的任何错误。 相反，无论它是什么，它们都将始终返回 true。

Answer 1

在我看来，如果你用一个double调用IsEmpty ，你只需要这个：

bool IsEmpty(double balance)
{
    if (balance == 0)
    {
        return true;
    }
    else
    {
        Console.WriteLine("The balance is not empty");
        return false;
    }
}

如果您使用数组调用它：

bool IsEmpty(params double[] balances)
{
    if (balances.Any(b => b == 0))
    {
        return true;
    }
    else
    {
        Console.WriteLine("No balance is empty");
        return false;
    }
}

params关键字允许您将数组作为单独的变量传递，例如IsEmpty(balance1, balance2, balance3) 。

请注意，我将方法的名称从isEmpty更改为IsEmpty以遵循标准的 C# 命名约定。

---

您还最好创建一个数组并使用自定义类型：

Account[] accounts = new Account[]
{
    new Account() { Customer = "John Doe", Number = 123456, Balance = 100m, },
    new Account() { Customer = "Jane Doe", Number = 654321, Balance = 200m, },
    new Account() { Customer = "John Smith", Number = 987654, Balance = 300m, },
};

public class Account
{
    public string Customer { get; set; }
    public int Number { get; set; }
    public decimal Balance { get; set; }
}