using System;

​

public class Program

{

    public static void easy()

    {

        int time = 0;

        Random rnd1 = new Random();

        int rnd = rnd1.Next(1,10);

        int rnd2 = rnd1.Next(1,10);

        while(true)

        {

            Console.WriteLine("{0} + {1} = ",rnd, rnd2);

            int answer = int.Parse(Console.ReadLine());

        int sum = rnd + rnd2;

        if(answer == sum)

        {

        time++;

            Console.WriteLine("Correct!");

        }

        if(time == 10)

        {

            Console.WriteLine("You got 10 right!");

            break;

        }       

        }

    }

    public static void average()

    {

        int time = 0;

        Random rnd1 = new Random();

        int rnd = rnd1.Next(1,10);

        int rnd2 = rnd1.Next(1,10);

        while(true)

        {

            Console.WriteLine("{0} * {1} = ",rnd, rnd2);

            int answer = int.Parse(Console.ReadLine());

        int sum = rnd * rnd2;

        if(answer == sum)

        {

        time++;

            Console.WriteLine("Correct!");

        }

        if(time == 10)

        {

            Console.WriteLine("You got 10 right!");

            break;

        }       

        }

    }

    public static void Main()

    {

        Console.WriteLine("Maths Game");

        while(true)

        {

        Console.WriteLine("Type = Easy, Average or Hard");  

        string diff = Console.ReadLine();

        diff = diff.ToLower();

        if(diff == "easy")

        {

        easy();

        }

        if(diff == "average")

        {

        average();

        }

        if(diff == "hard")

        {

        }

        }   

    }

}