Cara membuat program Calculator sederhana Part2

Ikuti Code dibawah ini :

1. reduction.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Reduction
    {
        public static void Perform1()
        {
            Console.Write("Input Number 1 = ");
            int num1 = int.Parse(Console.ReadLine());
            Console.Write("Input Number 2 = ");
            int num2 = int.Parse(Console.ReadLine());
            int result = num1 - num2;
            Console.Write("Result = ");
            Console.Write(result);
            Console.WriteLine();
        }
    }
} 

2. program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        public static void Main()
        {
        start:
            //Main Menu
            MainMenu();
        int choose = int.Parse(Console.ReadLine());
        Console.Clear();
        switch (choose)
        {
            case 1 :
                Addition.Perform1();
                goto start;
            case 2 :
                Reduction.Perform1();
                goto start;
            default :
                Console.Write("Sorry request can't be processed");
                Console.ReadLine();
                break;
        }
        }
        static void MainMenu()
        {
            Console.WriteLine("========= Calculator Program ========= \n");
            Console.WriteLine("Main Menu\n");
            Console.Write("1. Addition \n");
            Console.Write("2. Reduction \n");
            Console.Write("Your choose : ");
        }
    }
}

• Output