Ruby in cmd

ruby-talk
1

I am new to Ruby and am trying to run a piece of code from Programming
Ruby in cmd. When i run in cmd >ruby Song.rb, I don't get any output.
But I can get the result I expected when I run in irb. Can anyone help
me on this?

class Song
    def initialize(name , artist, duartion)
        @name = name
        @artist = artist
        @duration = duartion
    end

    def to_s
     "Song: #{system @name}--#{@artist} (#{@duration})"
    end

    def name
        @name
    end

    def artist
        @artist
    end

    def duration
        @duration
    end
end

aSong = Song.new("NAF", "AS", 300)
aSong.to_s
aSong.artist
aSong.name
aSong.duration

···

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

2

maung schrieb:

I am new to Ruby and am trying to run a piece of code from Programming
Ruby in cmd. When i run in cmd >ruby Song.rb, I don't get any output.
But I can get the result I expected when I run in irb. Can anyone help
me on this?

class Song
    def initialize(name , artist, duartion)
        @name = name
        @artist = artist
        @duration = duartion
    end

    def to_s
     "Song: #{system @name}--#{@artist} (#{@duration})"
    end

    def name
        @name
    end

    def artist
        @artist
    end

    def duration
        @duration
    end
end

aSong = Song.new("NAF", "AS", 300)
aSong.to_s
aSong.artist
aSong.name
aSong.duration

You need to put a puts/print in front of everything you want to output. So for example:
puts aSong.to_s

3

I am new to Ruby and am trying to run a piece of code from Programming
Ruby in cmd. When i run in cmd >ruby Song.rb, I don't get any output.
But I can get the result I expected when I run in irb. Can anyone help
me on this?

As there is no print/puts/etc. statement, this non-output is expected
from the file you wrote when run as a script.

irb is a read-eval-print loop. By default, it prints the output of the
expressions and that's why you see the output in this case.

···

On 6/15/07, maung <einaung@yahoo.com> wrote:

class Song
    def initialize(name , artist, duartion)
        @name = name
        @artist = artist
        @duration = duartion
    end

    def to_s
     "Song: #{system @name}--#{@artist} (#{@duration})"
    end

    def name
        @name
    end

    def artist
        @artist
    end

    def duration
        @duration
    end
end

aSong = Song.new("NAF", "AS", 300)
aSong.to_s
aSong.artist
aSong.name
aSong.duration

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

4

...

aSong = Song.new("NAF", "AS", 300)
aSong.to_s
aSong.artist
aSong.name
aSong.duration

To see the output, you have to put it out 9^)

try:
puts aSong.to_s
puts aSong.artist
puts aSong.name
puts aSong.duration

···

On Jun 15, 2:09 pm, maung <eina...@yahoo.com> wrote:

5

Adriano Ferreira wrote:

···

On 6/15/07, maung <einaung@yahoo.com> wrote:

I am new to Ruby and am trying to run a piece of code from Programming
Ruby in cmd. When i run in cmd >ruby Song.rb, I don't get any output.
But I can get the result I expected when I run in irb. Can anyone help
me on this?

As there is no print/puts/etc. statement, this non-output is expected
from the file you wrote when run as a script.

irb is a read-eval-print loop. By default, it prints the output of the
expressions and that's why you see the output in this case.

That's explained it. Thanks a lot. It saved me a lot of time.

Maung

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