From: "David A. Black" <dblack@...>
Date: 2005-11-01T09:41:13+09:00
Subject: Re: Newbie: How to format a number to always show two decimals?

Hi --

On Tue, 1 Nov 2005, Harold Hausman wrote:

> Alternatively there's this code from Phrogz's library (
> http://phrogz.net/rubylibs) which to me is more rubyish than sprintf.
> Everytime you use sprintf, God kills a kitten.
>
> -Harold
>
> #Code Follows:
>
> class Numeric
> # Rounds to the specified number of decimal places, returning a string
> value.
> #
> # (1.234).round_to(2) => '1.23'
> # (-1.234).round_to(2) => '-1.23'
> # (-0.007).round_to(2) => '-0.01'
> # (-0.007).round_to(1) => '0.0'
> def round_to(decimals)
> if self<0 then
> s='-';
> x=-self;
> else
> s='';
> x=self;
> end
> if x>=1.0e15 then
> m=x.to_s;
> else
> m=(x*10**decimals).round.to_s
> if (decimals!=0) then
> k=m.length;
> if k<=decimals then
> z='000000000000000'[0..(decimals-k)]
> m=z+m;
> k=decimals+1;
> end
> m.insert(k-decimals,'.');
> end
> end
> s='' if (/^0\.0*$/=~m);
> s+m;
> end
> end

Aside to Phrogz: is that left over from a game of code golf?? :-)


David

-- 
David A. Black
dblack@wobblini.net