Variables.cs

using System;

namespace LearnBasic.ConsoleCSharp
{
    class Program
    {
        static void Main(string[] args)
        {
            Menu();
        }

        static void Menu()
        {
            Console.Clear();
            Console.WriteLine("=========================================");
            Console.WriteLine("\t\tVariables");
            Console.WriteLine("=========================================");
            Console.WriteLine("1. Defining Variables");
            Console.WriteLine("2. Initialize Variable");
            Console.WriteLine("0. Exit");
            Console.Write("Select Menu : ");
            int sMenu = int.Parse(Console.ReadLine());
            SelectMenu(sMenu);
        }

        static void SelectMenu(int selectMenu)
        {
            bool exit = false;

            do
            {
                switch (selectMenu)
                {
                    case 1:
                        DefineVariable();
                        break;
                    case 2:
                        initializeVariable();
                        break;
                    case 0:
                        Environment.Exit(0);
                        break;
                    default:
                        Console.WriteLine("maaf yang anda ketikan tidak ada di menu pilihan");
                        Console.Write("Press button to next...");
                        Console.ReadKey();
                        Menu();
                        break;
                } 
            } while (!exit);
        }

        static void EndMenu()
        {
            bool exit = false;

            do
            {
                Console.WriteLine("\n(Y) kembali ke menu?");
                Console.WriteLine("(X) Exit?");
                string optionMenu = Console.ReadLine();
                switch (optionMenu.ToLower())
                {
                    case "y":
                        Menu();
                        break;
                    case "x":
                        exit = true;
                        Environment.Exit(0);
                        break;
                    default:
                        Console.WriteLine("maaf yang anda ketikan tidak ada di menu pilihan");
                        break;
                }
            } while (!exit);
        }

        static void DefineVariable()
        {
            int a;
            decimal b;
            float c;
            double d;

            a = 1;
            b = 2;
            c = 3;
            d = 4;

            Console.WriteLine("{0}, {1}, {2}, {3}", a, b, c, d);

            EndMenu();
        }

        static void initializeVariable()
        {
            int a = 1;
            decimal b = 2;
            float c = 3;
            double d = 4;

            Console.WriteLine("\nNilai awal : ");
            Console.WriteLine("{0}, {1}, {2}, {3}", a, b, c, d);

            a = 5;
            b = 6;
            c = 7;
            d = 8;

            Console.WriteLine("\nsetelah di manipulasi : ");
            Console.WriteLine("{0}, {1}, {2}, {3}", a, b, c, d);

            EndMenu();
        }
    }
}