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Question

这是一个作业，请看问题和我在下面写的代码。

问题： 在美国硬币系统中，一便士是基本硬币，它等于美分，一个镍相当于5美分，一角硬币相当于10美分，四分之一相当于25美分，半美元相当于到 50 美分。设计并实现一个程序，该程序将利用以下所示的功能。每个函数都有一个 int 形式参数 Amount。 a) HalfDollars ()：计算可用于找零的最大半美元数量。 b) Quarters()：计算可用于更改 Amount 的最大季度数 c) Dimes ()：计算可用于更改 Amount 的最大硬币数量 d) Nickels () : 计算可用于更改 Amount 的最大镍数

我写的代码：

//Question 1
//please note, i dont have comments everywhere

{

public class MoneyCalc 
{
    public int Amount;

    //a)
    public void Half_Dollar()
    {
        int hd = 2;
        int hdOutput = Amount * hd;

        Console.WriteLine("The maximum number of half dollars for " + Amount + " is: " + hdOutput);
    }

    //b)
    public void Quater()
    {
        int q = 4;
        int qOutput = Amount * q;

        Console.WriteLine("The maximum number of half dollars for " + Amount + " is: " + qOutput);
    }

    //c)
    public void Dimes()
    {
        int d = 10;
        int dOutput = Amount * d;

        Console.WriteLine("The maximum number of half dollars for " + Amount + " is: " + dOutput);
    }

    //d)
    public void Nickles()
    {
        int n = 20;
        int nOutput = Amount * n;

        Console.WriteLine("The maximum number of half dollars for " + Amount + " is: " + nOutput);
    }
}

class Program
{
    static void Main(string[] args)
    {
        //the main program.
        //everything is initialised here.

        //gets the amount the ser wants to calculate through user input in a string and converts to to an integer.
        Console.WriteLine("Please enter an amount to calculate:");
        string userAmount = Console.ReadLine();
        int amount = Int32.Parse(userAmount);

        //users have to make a selection from this list.
        Console.WriteLine("");
        Console.WriteLine("Please choose what you want to calculate you amount to (Select the number):");
        Console.WriteLine("1. Half Dollar");
        Console.WriteLine("2. Quater");
        Console.WriteLine("3. Dime");
        Console.WriteLine("4. Nickel");

        //gets the users input(their choice) in a string and coverts it to an integer
        string userChoice = Console.ReadLine();
        int choice = Int32.Parse(userAmount);

        if (choice == 1)
        {
            MoneyCalc moneycalc = new MoneyCalc();
            moneycalc.Amount = amount;

            moneycalc.Half_Dollar();
        }
        else if (choice == 2)
        {
            MoneyCalc moneycalc = new MoneyCalc();
            moneycalc.Amount = amount;

            moneycalc.Quater();
        }
        else if (choice == 3)
        {
            MoneyCalc moneycalc = new MoneyCalc();
            moneycalc.Amount = amount;

            moneycalc.Dimes();
        }
        else if (choice == 4)
        {
            MoneyCalc moneycalc = new MoneyCalc();
            moneycalc.Amount = amount;

            moneycalc.Nickles();
        }
        else
        {
            Console.WriteLine("Invalid Option");
        }


    }
}
}

Answer 1

我想，他们要找的是

// amount expected in $$, $2.34
public int GetNumberOfCoins(decimal amount, CoinOption centValue)
{
    // you might want to check first if result of truncate is larger than max int value
    int numberOfCoins = Convert.ToInt32(Math.Truncate(amount * 100 / (int)centValue));
    return numberOfCoins;
}

// And then in your console
public enum CoinOption : int
{
    Penny = 1,
    Nickel = 5,
    Dime = 10,
    Quarter = 25,
    Half = 50
}

string answer = null;
CoinOption opt;
switch (inputOption)
{
    case "1":
        opt = CoinOption.Penny;
        break;
    case "2":
        opt = CoinOption.Nickel;
        break;
    case "3":
        opt = CoinOption.Dime;
        break;
    case "4":
        opt = CoinOption.Quarter;
        break;
    case "5":
        opt = CoinOption.Half;
        break;
}

// inputAmount originally comes as string but needs to be converted to decimal
answer = GetNumberOfCoins(inputAmount, opt).ToString()