From: Fleck Jean-Julien <jeanjulien.fleck@...>
Date: 2009-07-19T02:04:56+09:00
Subject: Re: undefined method `*' for nil:NilClass (NoMethodError)

Hello Dwight,

> on line 18 of the following code (@height = @height * 1.1 in the method
> oneYearPasses), I get the error message that is in the subject line.

As Robert told, you just have to add

class OrangeTree
    MAXAGE = 10
    FIRSTFRUIT = 20
    FIRSTHEIGHT = 3.0

   def initialize
    @numFruit =0
    @age = 0
    @dead = false
    @height = FIRSTHEIGHT
   end

...
end

And it will (almost) work. Note that the construct '++' as in @age++
does not exist in ruby, neither does the construct '--', you will have
to write explicitly
@age += 1
and
@numFruit -= 1


Cheers,

-- 
JJ Fleck