From: gao bo <gaob06@...>
Date: 2007-05-19T11:27:37+09:00
Subject: Re: Why "NoMethodError" occurs

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that make sense
thanks


On 5/19/07, Mike Cahill <mike.cahill@comcast.net> wrote:
>
> U passed "332" as a string so it was stored as a string.   Take the quotes
> off 332 or better, in ur init, say @duration=duration.to_i
>
> Mike
>
>
> -----Original Message-----
> From: "gao bo" <gaob06@gmail.com>
> Date: Sat, 19 May 2007 11:07:17
> To:ruby-talk@ruby-lang.org (ruby-talk ML)
> Subject: Why "NoMethodError" occurs
>
> hi, everyone
> today i typed the code below in my IDE
>
> class Song
> attr_reader :name, :artist, :duration
> attr_writer :duration
>
> def initialize(name, artist, duration)
>    @name = name
>    @artist = artist
>    @duration = duration
> end
>
> def durationInMinutes
>    @duration/60.0
> end
>
> def durationInMinutes=(value)
>    @duration = (value * 60).to_i
> end
> end
>
> class Song
> def to_s
>    "song: #{@name}--#{@artist}  (#{@duration})"
> end
> end
>
> aSong = Song.new("hello", "zhutou","332")
>
> puts aSong.to_s
> puts aSong.durationInMinutes
>
> And i tried to run it, but the error occured:
>
> song: hello--zhutou  (332)
> song.rb:12:in `durationInMinutes': undefined method `/' for "332":String
> (NoMethodError)
> from song.rb:29
>
> Why?
>
> Thanks!
>
>

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