编辑代码

using System;

public class HelloWorld
{
    public static void Main()
    {
        Console.WriteLine();
        public int Add(int a, int b, int c = 5)
        {
            return a + b + c;
        }
        //Console.WriteLine(Add(5,4,3));
        //Console.WriteLine(Add(5,4));
        //Console.WriteLine(Add(b:4,a:3));                 
    }
}