Implement stars game

82 Stars/csharp/Stars/Game.cs

@@ -0,0 +1,94 @@
+using System;
+
+namespace Stars
+{
+    internal class Game
+    {
+        private readonly int _maxNumber;
+        private readonly int _maxGuessCount;
+        private readonly Random _random;
+
+        public Game(int maxNumber, int maxGuessCount)
+        {
+            _maxNumber = maxNumber;
+            _maxGuessCount = maxGuessCount;
+            _random = new Random();
+        }
+
+        internal void DisplayInstructions()
+        {
+            if (Input.GetString("Do you want instructions? ").Equals("N", StringComparison.InvariantCultureIgnoreCase))
+            {
+                return;
+            }
+
+            Console.WriteLine($"I am thinking of a number between 1 and {_maxNumber}.");
+            Console.WriteLine("Try to guess my number.  After you guess, I");
+            Console.WriteLine("will type one or more stars (*).  The more");
+            Console.WriteLine("stars I type, the close you are to my number.");
+            Console.WriteLine("One star (*) means far away, seven stars (*******)");
+            Console.WriteLine($"means really close!  You get {_maxGuessCount} guesses.");
+        }
+
+        internal void Play()
+        {
+            Console.WriteLine();
+            Console.WriteLine();
+
+            var target = _random.Next(_maxNumber) + 1;
+
+            Console.WriteLine("Ok, I am thinking of a number.  Start guessing.");
+
+            AcceptGuesses(target);
+        }
+
+        private void AcceptGuesses(int target)
+        {
+            for (int guessCount = 1; guessCount <= _maxGuessCount; guessCount++)
+            {
+                Console.WriteLine();
+                var guess = Input.GetNumber("Your guess? ");
+
+                if (guess == target)
+                {
+                    DisplayWin(guessCount);
+                    return;
+                }
+
+                DisplayStars(target, guess);
+            }
+
+            DisplayLoss(target);
+        }
+
+        private static void DisplayStars(int target, float guess)
+        {
+            var stars = Math.Abs(guess - target) switch
+            {
+                >= 64 => "*",
+                >= 32 => "**",
+                >= 16 => "***",
+                >= 8  => "****",
+                >= 4  => "*****",
+                >= 2  => "******",
+                _     => "*******"
+            };
+
+            Console.WriteLine(stars);
+        }
+
+        private static void DisplayWin(int guessCount)
+        {
+            Console.WriteLine();
+            Console.WriteLine(new string('*', 79));
+            Console.WriteLine();
+            Console.WriteLine($"You got it in {guessCount} guesses!!!  Let's play again...");
+        }
+
+        private void DisplayLoss(int target)
+        {
+            Console.WriteLine();
+            Console.WriteLine($"Sorry, that's {_maxGuessCount} guesses. The number was {target}.");
+        }
+    }
+}

82 Stars/csharp/Stars/Input.cs

@@ -0,0 +1,31 @@
+using System;
+
+namespace Stars
+{
+    internal static class Input
+    {
+        // Float, because that's what the BASIC input operation returns
+        internal static float GetNumber(string prompt)
+        {
+            Console.Write(prompt);
+
+            while (true)
+            {
+                var response = Console.ReadLine();
+                if (float.TryParse(response, out var value))
+                {
+                    return value;
+                }
+
+                Console.WriteLine("!Number expected - retry input line");
+                Console.Write("? ");
+            }
+        }
+
+        internal static string GetString(string prompt)
+        {
+            Console.Write(prompt);
+            return Console.ReadLine();
+        }
+    }
+}

82 Stars/csharp/Stars/Program.cs

@@ -6,7 +6,25 @@ namespace Stars
     {
         static void Main(string[] args)
         {
-            Console.WriteLine("Hello World!");
+            DisplayTitle();
+
+            var game = new Game(maxNumber: 100, maxGuessCount: 7);
+
+            game.DisplayInstructions();
+
+            while (true)
+            {
+                game.Play();
+            }
+        }
+
+        private static void DisplayTitle()
+        {
+            Console.WriteLine("                                  Stars");
+            Console.WriteLine("               Creative Computing  Morristown, New Jersey");
+            Console.WriteLine();
+            Console.WriteLine();
+            Console.WriteLine();
         }
     }
 }