Merge pull request #370 from cmaitchison/rock-scissors-paper-ruby

Add Ruby implementation of Rock Scissors Paper

74_Rock_Scissors_Paper/ruby/rockscissors.rb

@@ -0,0 +1,80 @@
+SCREEN_WIDTH = 72
+
+MOVE_WORDS = {
+  1 => 'PAPER',
+  2 => 'SCISSORS',
+  3 => 'ROCK'
+}
+
+WIN_TABLE = {
+  1 => 3,
+  2 => 1,
+  3 => 2
+}
+
+def center_text(text)
+  text.rjust((SCREEN_WIDTH / 2) + (text.size / 2))
+end
+
+def ask_for_number_of_games
+  loop do
+    puts "HOW MANY GAMES" 
+    response = STDIN.gets.to_i
+    return response if response > 0 and response < 11
+    puts "SORRY, BUT WE AREN'T ALLOWED TO PLAY THAT MANY."
+  end
+end
+
+def ask_for_human_move
+  loop do
+    puts "3=ROCK...2=SCISSORS...1=PAPER"
+    puts "1...2...3...WHAT'S YOUR CHOICE"
+    response = STDIN.gets.to_i
+    return response if [1,2,3].include?(response)
+    puts "INVALID"
+  end
+end
+
+def calculate_result(human_move, computer_move)
+  return 'TIE' if human_move == computer_move
+  return 'WIN' if WIN_TABLE[human_move] == computer_move
+  'LOSE'
+end
+
+puts center_text('GAME OF ROCK, SCISSORS, PAPER')
+puts center_text('CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY')
+puts
+puts
+puts
+
+number_of_games = ask_for_number_of_games
+games_won = 0
+games_lost = 0
+
+number_of_games.times do |game_number|
+  puts
+  puts "GAME NUMBER #{game_number + 1}"
+  computer_move = rand(3) + 1
+  human_move = ask_for_human_move
+  puts "THIS IS MY CHOICE..."
+  puts "...#{MOVE_WORDS[computer_move]}"
+  
+  case calculate_result(human_move, computer_move)
+  when 'WIN'
+    puts "YOU WIN!!!"
+    games_won += 1
+  when 'TIE'
+    puts "TIE GAME.  NO WINNER."
+  when 'LOSE'
+    puts "WOW!  I WIN!!!"
+    games_lost = games_lost += 1
+  end
+end
+
+puts
+puts "HERE IS THE FINAL GAME SCORE:"
+puts "I HAVE WON #{games_lost} GAME(S)."
+puts "YOU HAVE WON #{games_won} GAME(S)."
+puts "AND #{number_of_games - (games_lost + games_won)} GAME(S) ENDED IN A TIE."
+puts "THANKS FOR PLAYING!!"
+