C#复利计算器(初学者)

Question

C# 初学者，尝试创建一个程序，用户可以在其中输入金额、年份和费率，然后计算总金额。费率除以 100 得到小数值，年份乘以 12 得到月费率。

代码如下:

class Program
{  
    static void Main(string[] args)
    {
        CompoundClass program = new CompoundClass();

        Console.Write("Please enter the initial balance for your account: ");
        double balance = Convert.ToDouble(Console.ReadLine());

        Console.Write("Please enter the annual interest rate: ");
        double interestRate = Convert.ToDouble(Console.ReadLine());

        program.Rate(interestRate);

        Console.Write("How many years will you acrue interest? ");
        double anualAmount = Convert.ToDouble(Console.ReadLine());

        program.Years(anualAmount);

        Console.WriteLine($"Your balance after {anualAmount} years is {totalAmount:C}\n");

        Console.ReadLine();
    }
}

class CompoundClass
{
    public double rate;
    public double yearlyRate;
    public double balance;

    public void Rate(double interestRate)
    {
        if (interestRate > 0)
        {
           rate = interestRate / 100;
        }
    }

    public void Years(double anualAmount)
    {
        if (anualAmount > 0)
        {
            yearlyRate = anualAmount * 12;
        }
    }

    public void addMethod(double totalAmount)
    {
        for (int i = 1; i < yearlyRate + 1; i++)
        {
            totalAmount = balance * Math.Pow(1 + rate / yearlyRate, yearlyRate * i);
        }
    }
}

我不断收到错误:

CS0103The name 'totalAmount' does not exist in the current context.

我不知道是否有任何信息被正确提取和存储/计算。

Answer 1

您遇到该错误是因为“totalAmount”变量只能在 CompoundClass 中访问。这是因为它是使用默认访问修饰符 private 创建的。您为 CompoundClass 创建了一个对象

CompoundClass program = new CompoundClass();

您已经访问了使用该对象的方法。关于 annualAmount 或 interestRate 的问题，您没有从 CompoundClass 访问变量，您只是从 Program 类传递了它们。但是，您仍然可以通过 program.rate 等对象访问 rate、yearlyRate 和 balance。这是因为您已将它们声明为公开的。

public double rate;
public double yearlyRate;
public double balance;

如果您也想访问 totalAmount，请将其声明为公开。

program.addMethod(balance);
Console.WriteLine($"Your balance after {anualAmount} years is {program.totalAmount:C}\n");