Ruby

Day 1 Self Study

Find

The Ruby API
Free online version of Programming Ruby: The Pragmatic Programmer's Guide
A method that substitutes part of a string - .sub
Guide to Ruby's regular expressions - in between slashes, eg. /regex/
Guide to Ruby's ranges - eg. (1..20) - parentheses not necessary

Ruby Random Number Guessing Game

puts "Time to play the random number guessing game! Enter e for easy, h for hard, d for difficult or i for impossible!"

      x = gets.chomp.to_str
      
      case x
      when "e"
          puts "Easy mode. Guess a number from 0 to 9."
          upper_limit = 9
      when "h"
          puts "Hard mode. Guess a number from 0 to 99."
          upper_limit = 99
      when "d"
          puts "Difficult mode. Guess a number from 0 to 999."
          upper_limit = 999
      when "i"
          puts "Impossible mode. Guess a number from 0 to 9999."
          upper_limit = 9999
      else 
          puts "Incorrect difficulty entered - please enter e, h, d or i. Press enter to restart the game."
          gets
          load 'random-number-game.rb'
      end
      
      secret_num = rand(upper_limit)
      guess = nil
      guess_count = 0
      guess_limit = 20
      out_of_guesses = false
      
      while guess != secret_num and !out_of_guesses
          if guess_count < guess_limit
              puts "Enter your guess"
              guess = gets.chomp.to_i
              guess_count += 1;
              if guess < secret_num
                  puts "Higher!"
              elsif guess > secret_num
                  puts "Lower!"
              end
          else
              out_of_guesses = true
              break
          end
      end
      
      if out_of_guesses
        puts "You lose!"
        puts "You have reached the maximum number of guesses."
        puts "The secret number was #{secret_num}"
      else
        puts "Congratulations! You won!"
        puts "You guessed the secret number #{secret_num} and you did it in #{guess_count} guesses."
        puts "Hit enter to play again."
        gets
        load 'random-number-game.rb'
      end