game.rb

MIN=1
MAX=100
MAX_ATTEMPTS=5
won = false

guesses = []

secret = rand(MIN..MAX)
puts "Guess a number between " + MIN.to_s + " and " + MAX.to_s + ":"
begin
  guess = gets.chomp.to_i
  guesses.push(guess)
  if guess < secret
    puts "Higher:"
  elsif guess > secret
    puts "Lower:"
  elsif guess = secret
    won = true
    puts "Bingo!"
  else puts "Your input is not valid."  
  end
end until won or guesses.length == MAX_ATTEMPTS


puts "You chose " + guesses.to_s + ".  The number was " + secret.to_s

game2.rb

MIN=1
MAX=100
MAX_ATTEMPTS=5
PROMPT = "Please reply h, l, or ="

def bsearch(min, max, depth)
  guess = (min+max)/2
  depth += 1;

  puts "Is the number " + guess.to_s + "? " + PROMPT
  reply = gets.chomp

  if (reply == '=') # winner winner
    return "Bazinga! I guessed " + guess.to_s + " which is correct!"
  elsif (depth >= MAX_ATTEMPTS) # out of tries
    return "Fail!  All " + depth.to_s + " guesses were wrong."
  elsif (reply == 'h') #guess < secret
    return bsearch(guess+1, max, depth)
  elsif (reply == 'l')  #guess > secret
    return bsearch(min, guess-1, depth)
  else # invalid input => redo w/ same args
    puts PROMPT
    return bsearch(min, max, depth)
  end

end

puts "Would you like to play a game?  Pick a number between " + MIN.to_s + " and " + MAX.to_s + ":"
print bsearch(MIN, MAX, 0).to_s + "\n"