Program in C# to Design a simple calculator using Switch Statement.

using System;

namespace Lab_Ex_12
{
    class SimpleCalculator
    {
        double num1, num2;
        public void read()
        {
            Console.WriteLine("\n Enter any two numbers:");
            Console.Write("\n Number1 : ");
            num1 = double.Parse(Console.ReadLine());
            Console.Write("\n Number2 : ");
            num2 = double.Parse(Console.ReadLine());
        }
        public void add()
        {
            double sum = num1 + num2;
            Console.WriteLine("\n Result : ({0}) + ({1}) = {2}", num1, num2, sum);
        }
        public void subtract()
        {
            double diff = num1 - num2;
            Console.WriteLine("\n Result : ({0}) - ({1}) = {2}", num1, num2, diff);
        }
        public void multiply()
        {
            double prod = num1 * num2;
            Console.WriteLine("\n Result : ({0}) X ({1}) = {2}", num1, num2, prod);
        }
        public void divide()
        {
            double qt = num1 / num2;
            Console.WriteLine("\n Result : ({0}) / ({1}) = {2}", num1, num2, qt);
        }
    }
    class ArithmeticOperations
    {
        public static void Main()
        {
            SimpleCalculator SC = new SimpleCalculator();
            int ch, i=1;
            while(i==1)
            {
                Console.Clear();
                Console.WriteLine("\n *************************");
                Console.WriteLine("\n   SIMPLE CALCULATOR.");
                Console.WriteLine("\n *************************");
                Console.WriteLine("\n 1-----> ADDITION");
                Console.WriteLine("\n 2-----> SUBTRACTION");
                Console.WriteLine("\n 3-----> MULTIPLICATION");
                Console.WriteLine("\n 4-----> DIVISION");
                Console.WriteLine("\n 5-----> EXIT");
                Console.WriteLine("\n *************************");
                Console.Write("\n\n Enter your choice: ");
                ch = int.Parse(Console.ReadLine());
                switch (ch)
                {
                    case 1: SC.read();
                            SC.add();
                            break;
                    case 2: SC.read();
                            SC.subtract();
                            break;
                    case 3: SC.read();
                            SC.multiply();
                            break;
                    case 4: SC.read();
                            SC.divide();
                            break;
                    case 5: Environment.Exit(-1);
                            break;
                    default: Console.WriteLine(" Sorry !!! Wrong  choice.");
                            break;
                }
                Console.Write("\n Press ENTER to Continue. ");
                Console.ReadLine();
            }
            Console.WriteLine("\n Cannot continue... Bye");
        }
    }
}