使用类 C# 将数字转换为单词

Question

我知道这是一个以前被问过的问题，我已经解决了很多问题，但我真的需要一些帮助。

我正在尝试为家庭作业创建一个控制台程序，该程序接受用户输入的数字，然后将该数字转换为对应的单词。目前，我可以从输入创建一个数组，然后生成一个索引。我还可以返回 char 值以及该值的索引。即如果输入为 72，那么它将返回 7 = 0 和 2 = 1。

现在我基本上必须创建一个将获取该信息的类，然后运行代码以返回单词，但问题是，我根本无法理解类。我已经阅读了所有的笔记，我已经完成了额外的阅读并观看了视频，但我根本无法理解。问我的老师让我一无所获。

    class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("This program will convert numbers that you enter into their spoken English counterpart.\nExample: 100 = One Hundred.\n\nPlease enter your desired number to convert: ");
        string getinput = (Console.ReadLine());
        char[] getarray = getinput.ToCharArray();

        for (int getindex = 0; getindex < getarray.Length; getindex++)
        {
            char getchar = getarray[getindex];
            Console.WriteLine("getchar: " + getchar);
            //Console.WriteLine("getarray: " + getarray);
            Console.WriteLine("getindex: " + getindex);
            //int convertinput = Convert.ToInt32(getinput);
        }
    }
    class ToText
    {
        //attributes
        private string[] ones = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" }; //each value is part of the array
        private string[] teens = { "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" }; //array 0 in this set = "eleven" or tens[0] = "eleven"
        private string[] tens = { "ten", "twenty", "thirty", "fourty", "fifty", "sixty", "seventy", "eighty", "ninety" };
        private string[] moreThan99 = { "hundred", "thousand", "million", "billion", "trillion" };

        //methods
        public string ConvertToText()
        {

        }

        //constructors
        public ToText()
        {

        }

        //destructors
        ~ToText()
        {

        }
    }
}

我正在尝试了解如何将我创建的信息推送到班级然后再返回。

如果有人能帮助我理解我在做什么，那将不胜感激。

谢谢。

Answer 1

我根本无法理解课程

通过阅读您的示例，我推断问题是

“我已经声明了一个类和一些方法。我该如何称呼它？”

令人惊讶的是，在 SO（我能找到）上没有其他答案，所以我想有人必须回答。

一旦你完成了你的类的声明（你仍然需要在它的方法中加入一些逻辑，但我想你知道这一点）你需要弄清楚如何调用它。由于您的程序非常小，您可能希望通过 Main 方法调用它。

类只是一个类型。像任何类型一样，为了用它做任何有趣的事情，你必须创建一个 instance 并将它分配给一个变量。在此示例中，我将变量命名为 instance，但您应该使用描述性名称。

var instance = new ToText();

一旦你有了实例，你就可以调用它的方法了。

var output = instance.ConvertToText(input);

在上下文中它看起来像这样：

static public void Main(string[] args)
{
    //Your other code might go here
    var instance = new ToText();
    var output = instance.ConvertToText(input);
    //and here
}

这就是你如何创建一个类的实例（也就是一个对象）并调用它的方法。

注意：您的代码中还有很多其他问题，但我只是想回答这个问题。而且您应该知道，有一些方法可以在不实例化实例的情况下使用类（称为“静态”），但这似乎不是您分配的重点。

Answer 2

你可以通过两种方式调用你的类/方法

首先，您可以将您的 convertotext 方法创建为静态的。

public static string ConvertToText(string NumberToConvert)
{
  char[] getarray = NumberToConvert.ToCharArray();

    for (int getindex = 0; getindex < getarray.Length; getindex++)
    {
        char getchar = getarray[getindex];
        Console.WriteLine("getchar: " + getchar);
        //Console.WriteLine("getarray: " + getarray);
        Console.WriteLine("getindex: " + getindex);
        //int convertinput = Convert.ToInt32(getinput);
    }
    return ""; // return the Converted value

}

静态意味着您不需要创建 ToText 类的实例，然后在您的 main 方法中您可以这样调用它

static void Main(string[] args)
{
    Console.WriteLine("This program will convert numbers that you enter into their spoken English counterpart.\nExample: 100 = One Hundred.\n\nPlease enter your desired number to convert: ");
    // Static method call
    string ConvertedValue=ToText.ConvertToText(Console.ReadLine());
    Console.WriteLine(ConvertedValue);
}

或者你可以只创建一个实例方法

public string ConvertToText(string NumberToConvert)
{
 char[] getarray = NumberToConvert.ToCharArray();

 for (int getindex = 0; getindex < getarray.Length; getindex++)
 {
    char getchar = getarray[getindex];
    Console.WriteLine("getchar: " + getchar);
    //Console.WriteLine("getarray: " + getarray);
    Console.WriteLine("getindex: " + getindex);
    //int convertinput = Convert.ToInt32(getinput);
 }
 return ""; // return the Converted value
}

并像下面这样称呼它：

static void Main(string[] args){
   Console.WriteLine("This program will convert numbers that you enter into their spoken English counterpart.\nExample: 100 = One Hundred.\n\nPlease enter your desired number to convert: ");
   //Need to create an instance/object of ToText. Then call the ConvertToText via ToText Instance/Object
  ToText ToText=new ToText();
  string ConvertedValue=ToText.ConvertToText(Console.ReadLine());
  Console.WriteLine(ConvertedValue);
}

Answer 3

这是我的尝试。我可以做到 1 - 19。它通过方法将值从主类传递到另一个类。您能否在完成后发布完整的解决方案，因为我现在也在尝试解决这个问题。

class Program
{
    static void Main(string[] args)
    {

        //Ask the user to input a number
        Console.WriteLine("Please enter a number and this will convert it into the the word version of the number:");


        //Inputs from console are in a string format as readline returns string
        string UserInput = Console.ReadLine();

        //Make an instance of the ConvertNumber class where the method numberConversion lives. I've called the instance numberConversion.
        ConvertNumber numberConversion = new ConvertNumber();

        //Here I'm saying numberConversion use your method NumberTooText and I'm sending the UserInput from this class along with it.
        numberConversion.NumberTooText(UserInput);

        }
    }


    class ConvertNumber
        {
            //I combined your first two arrays for one to nineteen
            private string[] oneToNineteen = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" }; //each value is part of the array

            //Method for number to text
            public void NumberTooText(string userinput) {

             //As I wanted to iterate and use the number for the array index we need to convert the string we got from program cs to int
                int number = Int32.Parse(userinput);

            //If the number is 19 or less the console will write from the array[userInputNumber]
// In the else statement you can create a method for greater than 19
                if (number <= 19) {
                    Console.WriteLine(oneToNineteen[number]);
                    }
                }

            }