using System;

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namespace parasakababayan

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{

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    class Program

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    {

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        static void Main(string[] args)

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        {

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            string first, second;

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            double unangnumero, pangalwangnumer;

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            do

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            {

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                Console.WriteLine("Enter (C) TO CONTINUE");

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                Console.WriteLine("Enter (E) TO EXIT");

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                string choose = Console.ReadLine();

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                if (choose.Equals("E") || choose.Equals("e"))

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                {

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                    Console.WriteLine("Program Has Stopped");

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                    break;

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                }

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                else

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                {

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                    Console.WriteLine("Choose Operator (-,+,/,*)");

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                    string operators = Console.ReadLine();

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                    if (operators.Equals("-"))

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                        {

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                        Console.WriteLine("Substraction");

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                        Console.Write("1st Number: ");

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                        first = Console.ReadLine();

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                        unangnumero = Convert.ToInt32(first);

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                        Console.Write("2nd Number: ");

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                        second = Console.ReadLine();

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                        pangalwangnumer = Convert.ToInt32(second);

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                        Console.Write("Answer: ");

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                        Console.WriteLine(unangnumero-pangalwangnumer);

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                    }

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                    if (operators.Equals("+"))

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                    {

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                        Console.WriteLine("Addition");

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                        Console.Write("1st Number: ");

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                        first = Console.ReadLine();

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                        unangnumero = Convert.ToInt32(first);

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                        Console.Write("2nd Number: ");

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                        second = Console.ReadLine();

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                        pangalwangnumer = Convert.ToInt32(second);

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                        Console.Write("Answer: ");

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                        Console.WriteLine(unangnumero + pangalwangnumer);

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                    }

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                    if (operators.Equals("/"))

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                    {

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                        Console.WriteLine("Division");

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                        Console.Write("1st Number: ");

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                        first = Console.ReadLine();

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                        unangnumero = Convert.ToInt32(first);

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                        Console.Write("2nd Number: ");

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                        second = Console.ReadLine();

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                        pangalwangnumer = Convert.ToInt32(second);

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                        Console.Write("Answer: ");

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                        Console.WriteLine(unangnumero / pangalwangnumer);

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                    }

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                    if (operators.Equals("*"))

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                    {

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                        Console.WriteLine("Multiplication");

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                        Console.Write("1st Number: ");

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                        first = Console.ReadLine();

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                        unangnumero = Convert.ToInt32(first);

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                        Console.Write("2nd Number: ");

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                        second = Console.ReadLine();

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                        pangalwangnumer = Convert.ToInt32(second);

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                        Console.Write("Answer: ");

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                        Console.WriteLine(unangnumero * pangalwangnumer);

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                    }

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                }

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             } while (true);

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        }

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    }

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}

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​