using System;

public class Program

{

    public static void Main()

    {

        while(true){

        try{

            Console.WriteLine("Enter first number: ");

        double num1 = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("Enter second number: ");

        double num2 = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("---------------------------------- \n1:Add 2:Subtract 3:Multiply 4!devide");

            int choices = Convert.ToInt16(Console.ReadLine());

            Console.WriteLine("----------------------------------");

            switch(choices){

                case 1:

                    double sum = num1+num2;

                    Console.WriteLine("{0} + {1} = {2}",num1,num2,sum);

                    Console.WriteLine("----------------------------------");

                    break;

                case 2:

                    double subtract = num1-num2;

                    Console.WriteLine("{0} - {1} = {2}",num1,num2,subtract);

                    Console.WriteLine("----------------------------------");

                    break;

                case 23:

                    double multy = num1*num2;

                    Console.WriteLine("{0} * {1} = {2}",num1,num2,multy);

                    Console.WriteLine("----------------------------------");

                    break;

                case 4:

                    if(num2==0){

                    Console.WriteLine("Devisor Cannot be 0 \nTry Again");

                        Console.WriteLine("----------------------------------");

                    continue;

                    }

                    else{

                    double Quotient = num1/num2;

                    Console.WriteLine("{0} / {1} = {2}",num1,num2,Quotient);

                        Console.WriteLine("----------------------------------");

                    break;

                    }

            }

            Console.WriteLine("Compute again? 1:Yea 2:No");

            int ch=Convert.ToInt32(Console.ReadLine());

            if(ch==1)continue;

            else if(ch==2)break;

        }

        catch(FormatException){

            Console.WriteLine("Invalid Input \nTry Again");

            Console.WriteLine("----------------------------------");

        }

        }

}

}

​

​

​