C# Start "Hello World!

using System;

namespace Kor.Ofic.Bee.ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");

            Console.WriteLine("I Want Addition!. Please enter two numbers.");
            Console.WriteLine("First number:   ");
            int num1 = int.Parse(Console.ReadLine());       // first number insert and conversion

            Console.WriteLine("Second number:  ");
            int num2 = int.Parse(Console.ReadLine());       // second number insert and conversion

            // {0} location Set num1 {1} location set num2
            Console.WriteLine("Two number addition : {0} + {1} = {2}", num1, num2, num1+num2);
        }
    }
}