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class CD
include Comparable
@@plays = 0
attr_reader :name, :artist, :duration
attr_writer :duration
def initialize(name, artist, duration)
@name = name
@artist = artist
@duration = duration
@plays = 0
end
def to_s
"CD: #@name--#@artist (#@duration)"
end
def duration_in_minutes=(new_duration)
@duration = (new_duration*60).to_i
end
def play
@plays += 1
@@plays += 1
"This CD: #@plays plays. Total #@@plays plays."
end
def inspect
self.to_s
end
def <=>(other)
self.duration <=> other.duration
end
end
d = CD.new("A", "B", 1)
d.to_s
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