调用函数 C#

Question

This piece of code is suppose to get a letter from the user in 'alphabet' and return the corresponding letter in mapsTo. eg 'A' will result in 'Z'

class Program
      {
        static void Main()
        {
        }
        char[] alphabet = { 'A', 'B', 'C' }; 
        char[] mapsTo = { 'Z', 'Y', 'X' };
        public string changeLetter(char input)

        {
            int i = 0;

            foreach (char c in alphabet)
            {
                if (c == input)
                {
                    return mapsTo[i].ToString();
                }
               i++;
            }
            return default(char).ToString();
        }
    }
    }

I know that the code below will store the user input, but I am unsure what is next, and where in the program that code should be placed

Console.WriteLine("Please enter a number");
            userInput= Console.ReadLine;

Any help appreciated, thanks

Answer 1

A good place to start would be the Main-method i guess. When you run the application the Main-method will be called. If you put your writeline and userInput variable there, you would be able to call your changeLetter method with userInput as argument. Just store the return statement as a new variable and go from there

Answer 2

You forgot the parentheses:

userInput = Console.ReadLine();

Also, your main code goes in Main() , like this:

static void Main()
{
    // code here
}