gistfile1.cs

using System;

namespace GuessTheNumber
{
	internal class Program
	{
		private static void Main()
		{
			Random rng = new Random();
			int min = 0, guess = 0, tries = 0, max = 100, number = rng.Next(1, 100);
			bool ai = false;

			Console.WriteLine("Do you want to [g]uess or [c]hoose?");
			string choice = Console.ReadLine();
			if (choice.StartsWith("c"))
			{
				Console.WriteLine("Insert your number between 1 and 100:");
				int.TryParse(Console.ReadLine(), out number);
				ai = true;
			}

			string message = ai
				                 ? "You generated a number between 1 and 100. Let me try"
				                 : "I generated a number between 1 and 100. Can you guess it?";
			Console.WriteLine(message);

			while (guess != number)
			{
				int.TryParse(ai
					             ? (guess < number ? rng.Next(min, max = guess) : rng.Next(min = guess, max)).ToString()
					             : Console.ReadLine(),
				             out guess);
				if (guess != number)
					Console.WriteLine("No, it's {0} than {1}. Try again.", guess < number ? "higher" : "lower", guess);
				tries++;
			}
			message = ai
				          ? "Great, the answer was {0}. It took me {1} tries."
				          : "Great, the answer was {0}. It took you {1} tries.";
			Console.WriteLine(message, number, tries);
			Console.ReadLine();
		}
	}
}