Help! Please, I'm lost!

ruby-talk
1

Well, I'm a spanish user, so I'm sorry if my English isn't good
enough.Here`s my problem:
I'm a total newbie in Ruby (just finished Hackety Hacks) and I want to
develop a program like this:
Let's have a dice. Written on the dice, there are six values: - - 0 0 +
+.
The "minus" value substracts one point, the "zero" doesn't do anything
at all, and the "plus" value adds one point.
I want to create a program that asks the user how many dices wants to
roll and roll them, showing the values (not math values, but printed
values instead) and the result of adding every value.
Optionally, I want the program to ask the user if he/she wants only the
positive rolls to count, if possible.
Can anybody help me, please? I don't have any idea...and I need this
program.

···

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2

Do you want hints to solve it yourself, or the answer? Here are some hints:

1. Use an array to represent each die

2. The way to get a random number out of an array:

r = rand(array.length) - 1
random_value = array[r]

martin

···

On Sun, Jan 23, 2011 at 8:56 PM, Dark Haukka <lord_dark_haukka@hotmail.com> wrote:

Let's have a dice. Written on the dice, there are six values: - - 0 0 +
+.
The "minus" value substracts one point, the "zero" doesn't do anything
at all, and the "plus" value adds one point.
I want to create a program that asks the user how many dices wants to
roll and roll them, showing the values (not math values, but printed
values instead) and the result of adding every value.

3

Hello,

just a hint for the interactive part: have a look at the
highline gem (http://lmgtfy.com/?q=Ruby+HighLine\)

Have fun!

···

On Sun, Jan 23, 2011 at 4:26 PM, Dark Haukka <lord_dark_haukka@hotmail.com>wrote:

Well, I'm a spanish user, so I'm sorry if my English isn't good
enough.Here`s my problem:
I'm a total newbie in Ruby (just finished Hackety Hacks) and I want to
develop a program like this:
Let's have a dice. Written on the dice, there are six values: - - 0 0 +
+.
The "minus" value substracts one point, the "zero" doesn't do anything
at all, and the "plus" value adds one point.
I want to create a program that asks the user how many dices wants to
roll and roll them, showing the values (not math values, but printed
values instead) and the result of adding every value.
Optionally, I want the program to ask the user if he/she wants only the
positive rolls to count, if possible.
Can anybody help me, please? I don't have any idea...and I need this
program.

--
Posted via http://www.ruby-forum.com/\.

--
PhD Student, Computer Science Department, EPL/INGI, UCLouvain, Belgium
Mail: blambeau@gmail.com
Mobile: +32 477 24 58 61
Blog: http://revision-zero.org/
Code: blambeau (Bernard Lambeau) · GitHub
Follow: http://twitter.com/blambeau/

4

Well I tried that code but, when I try to run it, Shoes freezes and RDE
doesn't do anything at all.. What am I doing wrong?

···

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5

KO, sorry for the double posting, but I can't edit my last message. I
finally made it work in Netbeans, so REALLY thank you for your help. Now
all that remains is change the puts command for a command that show
dialog boxes and compile the app into an exe. THANKS!

···

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6

Martin DeMello wrote in post #976930:

Do you want hints to solve it yourself, or the answer? Here are some

martin

The answer well explained for a newbie, plz. Thanks.

···

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7

it's pure ruby code, not shoes. not sure why rde doesn't do anything,
it's probably the call to gets. try running it from the command line,
it should work fine there.

martin

···

On Sun, Jan 23, 2011 at 10:00 PM, Dark Haukka <lord_dark_haukka@hotmail.com> wrote:

Well I tried that code but, when I try to run it, Shoes freezes and RDE
doesn't do anything at all.. What am I doing wrong?

8

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}"

9

Martin DeMello wrote in post #976948:

···

On Sun, Jan 23, 2011 at 10:00 PM, Dark Haukka > <lord_dark_haukka@hotmail.com> wrote:

Well I tried that code but, when I try to run it, Shoes freezes and RDE
doesn't do anything at all.. What am I doing wrong?

it's pure ruby code, not shoes. not sure why rde doesn't do anything,
it's probably the call to gets. try running it from the command line,
it should work fine there.

martin

It isn't. When I try to run it from console, it asks for the number of
dices, and no matter the number I put, it returns "nil". Thank you for
all your help, and please excuse me, I'm a total newbie.

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