Newbie - error while trying subclass


#1

I am trying to subclass in my code (see below). But I am getting the
following error while running the code.

song.rb:12: class/module name must be CONSTANT
class karaokeSong < Song
^
song.rb:23: warning: don’t put space before argument parentheses

Not able to figure why “<” is not being accepted for subclassing. I am
using 1.8.6 version on windows. Pls. help


class Song
def initialize (name, artist, duration)
@name = name
@artist = artist
@duration = duration
end
def to_s
“Song: #{@name}–#{@artist} #{@duration}”
end
end

class karaokeSong < Song
def initialize (name, artist, duration, lyrics)
super(name, artist, duration)
@lyrics = lyrics
end
end

aSong = karaokeSong.new (“Bicyclops”, “Fleck”, 260, “And, now the”)
puts aSong.inspect
puts aSong.to_s


#2

Hi –

On Mon, 15 Dec 2008, Rubystudent wrote:

I am trying to subclass in my code (see below). But I am getting the
following error while running the code.

song.rb:12: class/module name must be CONSTANT
class karaokeSong < Song
^

karaokeSong isn’t a constant. Try KaraokeSong (uppercase ‘K’).

David


#3

Rubystudent wrote:

What version of ruby are you using?

See below for changes:

class karaokeSong < Song

class KaraokeSong < Song

aSong = karaokeSong.new (“Bicyclops”, “Fleck”, 260, “And, now the”)

aSong = KaraokeSong.new(“Bicyclops”, “Fleck”, 260, “And, now the”)

That should remedy the problem.


#4

Try capitalizing karaokeSong

the first error is complaining about the class name not being CONSTANT.


#5

David, Tim - Thanks a lot.
It worked.

Sunil