using System;

namespace First_Project
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			Start:
			Random numberGenerator = new Random ();
			Random eqGenerator = new Random ();
			int num01 = numberGenerator.Next (1, 10);
			int num02 = numberGenerator.Next (1, 10);
			int answer;

			int eqIndex = eqGenerator.Next(1, 5);
			switch (eqIndex) {
			case 1:
				Console.WriteLine (num01 + " / " + num02 + " = ?");
				answer = Convert.ToInt32 (Console.ReadLine ());

				if (answer == num01 / num02) {
					Console.WriteLine ("Correct!");
				} else {
					Console.WriteLine ("Incorrect!");
				}
				break;

			case 2:
				Console.WriteLine (num01 + " * " + num02 + " = ?");
				answer = Convert.ToInt32 (Console.ReadLine ());

				if (answer == num01 * num02) {
					Console.WriteLine ("Correct!");
				} else {
					Console.WriteLine ("Incorrect!");
				}
				break;

			case 3:
				Console.WriteLine (num01 + " + " + num02 + " = ?");
				answer = Convert.ToInt32 (Console.ReadLine ());

				if (answer == num01 + num02) {
					Console.WriteLine ("Correct!");
				} else {
					Console.WriteLine ("Incorrect!");
				}
				break;

			case 4:
				Console.WriteLine (num01 + " - " + num02 + " = ?");
				answer = Convert.ToInt32 (Console.ReadLine ());

				if (answer == num01 - num02) {
					Console.WriteLine ("Correct!");
				} else {
					Console.WriteLine ("Incorrect!");
				}
				break;
			}

			Console.ReadKey ();
			Console.WriteLine ();
			goto Start;
		}
	}
}