using System;

public class Program

{

    public static void Main()

    {

        double number1;

        double number2;

        double result;

        int choice;

        Console.WriteLine("1. Addition\n2. Subtraction\n3. Multiplication\n4. Division");

        choice = Convert.ToInt16(Console.ReadLine());

        if(choice == 1)

        {

            Console.WriteLine("Enter number 1");

            number1 = Convert.ToInt16(Console.ReadLine());

            Console.WriteLine("Enter number 2");

            number2 = Convert.ToInt16(Console.ReadLine());

            result = number1 + number2;

            Console.WriteLine("result:");

            Console.WriteLine(result);

            if(result%2==0)

            {

                Console.WriteLine("The number is even.");

                }

            else

                Console.WriteLine("The number is odd.");

    }

          if(choice == 2)

          {

              Console.WriteLine("Enter number 1.");

              number1 = Convert.ToInt16(Console.ReadLine());

              Console.WriteLine("Enter number 2.");

              number2 = Convert.ToInt16(Console.ReadLine());

              result = number1 - number2;

              Console.WriteLine("result:");

              Console.WriteLine(result);

              if(result%2==0)

              {

                  Console.WriteLine("The number is even.");

}

              else

                  Console.WriteLine("The number is odd.");

    }

       if(choice == 3)

        {

           Console.WriteLine("Enter number 1.");

           number1 = Convert.ToInt16(Console.ReadLine());

           Console.WriteLine("Enter number 2.");

           number2 = Convert.ToInt16(Console.ReadLine());

           result = number1 * number2;

           Console.WriteLine("result:");

           Console.WriteLine(result);

           if(result%2==0)

           {

               Console.WriteLine("The number is even.");               

}

           else

               Console.WriteLine("The number is odd");

    }

        if(choice == 4)

        {

            Console.WriteLine("Enter number 1.");

            number1 = Convert.ToInt16(Console.ReadLine());

            Console.WriteLine("Enter number 2.");

            number2 = Convert.ToInt16(Console.ReadLine());

            result = number1/number2;

            Console.WriteLine("result:");

            Console.WriteLine(result);

            if(result%2==0)

          {

                Console.WriteLine("The number is even.");

        }

            else

                Console.WriteLine("The number is odd.");

        {

        int score= 0;

        int answer;

        Console.WriteLine("Welcome to the quiz");

        Console.WriteLine("Choose one of the following answers:");

        Console.WriteLine("Q1.In which year afghanistan  came into being ?");

        Console.WriteLine("1. 1980\n2. 1656\n3. 1747\n4.1822.");

        answer = Convert.ToInt16(Console.ReadLine());

        if(answer==3)

        {

             score++;

             Console.WriteLine("Correct:)");

             Console.WriteLine(score);

        }

        else

        {  

        Console.WriteLine("Wrong:(");

        score--;

        Console.WriteLine(score);

    {

        Console.WriteLine("Q2. Who discovered gravity?");

        Console.WriteLine("1. James chadwick.\n2. Ernest rutherfords.\n3. Isaac newton.\n4. Roger penrose.");

        answer = Convert.ToInt16(Console.ReadLine());

        if(answer == 3)

        {

            Console.WriteLine("Correct:)");

            score++;

            Console.WriteLine(score);

    }

        else 

        Console.WriteLine("Wrong:(");

        score--;

        Console.WriteLine(score);

    }

        Console.WriteLine("Q3. Who is the CEO of google? ");

        Console.WriteLine("1. sundar pichai .\n2. elon musk .\n3. larry page .\n4. satya nadella. ");

        answer = Convert.ToInt16(Console.ReadLine());

        if(answer == 1)

        {

            Console.WriteLine("Correct:)");

            score++;

            Console.WriteLine(score);

    }

        else

        Console.WriteLine("Wrong:(");

        score--;

        Console.WriteLine(score);

    {

        Console.WriteLine("Q4. Who is the father of biology?");

        Console.WriteLine("1. plato .\n2. socrates \n3. pythatros \n4. aristotle.");

        answer = Convert.ToInt16(Console.ReadLine());

        if(answer == 4)

        {

        Console.WriteLine("Correct:)");

        score++;

        Console.WriteLine(score);

    }

        else

        Console.WriteLine("Wrong:(");

        score--;

        Console.WriteLine(score);

}

    }

}

​