Merge pull request #602 from glv/main

ruby version of 92_Trap

92_Trap/ruby/trap.rb

@@ -0,0 +1,98 @@
+#!/usr/bin/env ruby
+
+# Trap
+# Steve Ullman, 1972-08-01
+# Ruby version Glenn Vanderburg, 2022-03-04
+
+# Change these values to make the game easier or harder.
+GUESSES_PER_GAME = 6
+NUMBER_UPPER_BOUND = 100
+
+# Put everything in methods for order of presentation; we
+# want to be able to refer to methods before declaring them,
+# so the code reads nicely from top to bottom.
+def main
+  print_banner_and_instructions
+
+  loop do
+    play_a_game
+    break unless yes?("Try again?")
+  end
+end
+
+def yes?(prompt)
+  print "\n#{prompt} "
+  answer = gets
+  return answer.downcase.start_with?("y")
+end
+
+def print_banner_and_instructions
+  banner = "Creative Computing -- Morristown, New Jersey"
+
+  puts "Trap!".center(banner.size)
+  puts banner
+  2.times { puts }
+
+  return unless yes?("Instructions?")
+
+  puts <<~"END"
+    I am thinking of a number between 1 and #{NUMBER_UPPER_BOUND}.
+    Try to guess my number. On each guess,
+    you are to enter 2 numbers, trying to trap
+    my number between the two numbers. I will
+    tell you if you have trapped my number, if my
+    number is larger than your two numbers, or if
+    my number is smaller than your two numbers.
+    If you want to guess one single number, type
+    your guess for both your trap numbers.
+    You get #{GUESSES_PER_GAME} guesses to get my number.
+  END
+end
+
+def play_a_game
+  n = choose_number
+
+  GUESSES_PER_GAME.times do |i|
+    lower, upper = get_guesses("Guess ##{i+1}?")
+
+    case
+    when n < lower
+      puts "My number is smaller than your trap numbers."
+    when n > upper
+      puts "My number is larger than your trap numbers."
+    when lower != upper
+      puts "You have trapped my number."
+    else
+      puts "You got it!!!"
+      return
+    end
+  end
+
+  puts "Sorry, that's #{GUESSES_PER_GAME} guesses. Number was #{n}"
+end
+
+def choose_number
+  rand(NUMBER_UPPER_BOUND) + 1
+end
+
+def get_guesses(prompt)
+  loop do
+    print "\n#{prompt} "
+
+    # This is forgiving of input format; it ignores spaces and
+    # punctuation, returning only the strings of consecutive
+    # digits in the input line.
+    guesses = gets.scan(/\d+/)
+
+    if guesses.size != 2
+      puts "Please enter two numbers for each guess."
+    else
+      # convert the strings of digits to integers:
+      numbers = guesses.map(&:to_i)
+      # and return them, lowest number first:
+      return numbers.sort
+    end
+  end
+end
+
+main