From: Martin DeMello <martindemello@...>
Date: 2011-01-24T01:12:23+09:00
Subject: Re: Help! Please, I'm lost!

On Sun, Jan 23, 2011 at 9:15 PM, Dark Haukka >
> The answer well explained for a newbie, plz. Thanks.

Here you go. We make a class to represent a die, with methods to roll
it and display the top face.

# --------------------------------------------------------------------

# represent a die
class Die
  FACES = [-1, -1, 0, 0, 1, 1]

  # we will let the value be read, but not written to
  attr_reader :value

  def initialize
    # to begin with the die has not been rolled, and
    # hence has no value
    @value = nil
  end

  # set the value to a random face
  def roll
    r = rand(6)
    @value = FACES[r]
  end

  # return the face value of the die as a string
  def display_value
    case @value
    when -1; "-"
    when  0; "0"
    when  1; "+"
    else "NOT ROLLED!"
    end
  end
end

# play the game

# loop until a valid number is entered
n = 0
while true do
  puts "How many dice do you want to roll?"
  number = gets
  n = number.to_i # convert string to integer
  if n > 0
    break
  end
end

# this creates an array of n Die objects
dice = Array.new(n) { Die.new }

# roll the dice
dice.each {|die| die.roll}

# display and total the dice
total = 0
dice.each_with_index do |die, i|
  total += die.value
  puts "Die number #{i} shows: #{die.display_value}"
end

puts
puts "Your total score is #{total}"