From: Gavin Kistner <phrogz@...>
Date: 2007-11-21T05:43:19+09:00
Subject: Re: How to Round off and Truncate in ruby

Surjit Nameirakpam wrote:
> Surjit Nameirakpam wrote:
>> I am getting the truncate but the round off mentioned above doesn't work
> 
> Sorry.. Its the opposite round of works but truncate doesn't work

Ah, I missed that you also wanted truncate.

irb(main):001:0> class Numeric
irb(main):002:1>   # same potential floating point problem as round_to
irb(main):003:1*   def truncate_to( decimals=0 )
irb(main):004:2>     factor = 10.0**decimals
irb(main):005:2>     (self*factor).floor / factor
irb(main):006:2>   end
irb(main):007:1> end
=> nil
irb(main):008:0>
irb(main):009:0* x = 12.45678
=> 12.45678
irb(main):010:0> x.truncate_to( 3 )
=> 12.456
irb(main):011:0> x.to_s.sub /(\.\d{3}).+/, '\1'
=> "12.456"
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