using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace littleprofessor
{
    class Program
    {
        static void Main(string[] args)
        {
            int akrai;
            int first;
            Random rnd = new Random();

            Random num = new Random();

            int correct=0;
            int answer = 0;


            Console.WriteLine("How many questions?");
            int questions;
            do
            {
                questions = int.Parse(Console.ReadLine());
            }
            while (questions < 1);
            Random num2 = new Random();
            Console.WriteLine("Choose level of difficulty from 1 to 3, 1 is easiest, 3 is hardest");
            int level=0;
            do
            {
                level = int.Parse(Console.ReadLine());
            }
            while ((level < 1) || (level > 3));

            for (int i = 1; i <= questions; i++)
            {
                if (level == 1)
                {

               akrai = rnd.Next(3);
                    if (akrai==1)
                    {
                        first = num.Next(9) + 1;
                        int second = num2.Next(9) + 1;
                        Console.WriteLine(first + "+" + second + "=");
                        correct = first + second;
                        answer = int.Parse(Console.ReadLine());
                        if (answer == correct)
                        {
                            Console.WriteLine("Correct!");
                        }
                        else
                        {
                            Console.WriteLine("Try again");
                            answer = int.Parse(Console.ReadLine());
                            if (answer == correct)
                            {
                                Console.WriteLine("Correct!");
                            }
                            else
                            {
                                Console.WriteLine("Wrong! " + first + "+" + second + "=" + correct);
                            }

                        }
                    }
                    if (akrai==2)
                    {
                        int second = num2.Next(9) + 1;
                        int first = num.Next(9) + second;
                        Console.WriteLine(first + "-" + second + "=");
                        correct = first - second;
                        answer = int.Parse(Console.ReadLine());
                        if (answer == correct)
                        {
                            Console.WriteLine("Correct!");
                        }
                        else
                        {
                            Console.WriteLine("Try again");
                            answer = int.Parse(Console.ReadLine());
                            if (answer == correct)
                            {
                                Console.WriteLine("Correct!");
                            }
                            else
                            {
                                Console.WriteLine("Wrong! " + first + "-" + second + "=" + correct);
                            }

                        }
                    }
                    if (akrai==3)
                    {
                        int second = num2.Next(9) + 1;
                        int first = num.Next(9) + 1;
                        Console.WriteLine(first + "*" + second + "=");
                        correct = first * second;
                        answer = int.Parse(Console.ReadLine());
                        if (answer == correct)
                        {
                            Console.WriteLine("Correct!");
                        }
                        else
                        {
                            Console.WriteLine("Try again");
                            answer = int.Parse(Console.ReadLine());
                            if (answer == correct)
                            {
                                Console.WriteLine("Correct!");
                            }
                            else
                            {
                                Console.WriteLine("Wrong! " + first + "*" + second + "=" + correct);
                            }

                        }
                    }
                    if (akrai == 0)
                    {
                        do
                        {
                        int second = num2.Next(9) + 1;
                        int first = num.Next(9) + second;
                    }
                    while (num1%num2!=0);
                }

                        Console.WriteLine(first + "-" + second + "=");
                        correct = first - second;
                        answer = int.Parse(Console.ReadLine());
                        if (answer == correct)
                        {
                            Console.WriteLine("Correct!");
                        }
                        else
                        {
                            Console.WriteLine("Try again");
                            answer = int.Parse(Console.ReadLine());
                            if (answer == correct)
                            {
                                Console.WriteLine("Correct!");
                            }
                            else
                            {
                                Console.WriteLine("Wrong! " + first + "-" + second + "=" + correct);
                            }

                        }
                    }
                    akrai = 2;

                }
                if (level == 2)
                {
                }
                if (level == 3)
                {
                }
            }

        }
    }
}