From: "i.v.r." <ivanvega@...>
Date: 2005-11-02T05:43:35+09:00
Subject: Re: Newbie: How to format a number to always show two decimals?

What's wrong with sprintf? I don't see how sprintf is evil versus the 
long procedure you detailed, but what do I know... I'm just a BASIC 
programmer, LOL.

Ivan

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
>
>
> On 10/31/05, i.v.r. <ivanvega@gmail.com> wrote:
>   
>> James Edward Gray II wrote:
>>     
>>> On Oct 31, 2005, at 4:47 PM, i.v.r. wrote:
>>>
>>>       
>>>> Hi,
>>>>
>>>> This seems like a simple task, yet I've been unable to accomplish it.
>>>> Somewhere I read you could do:
>>>>
>>>> num.round(2).to_s("F")
>>>>
>>>> But that is not working, as the round method doesn't accept any
>>>> parameters.
>>>>
>>>> Could someone help me figure this out?
>>>>         
>>>>> sprintf("%.2f", 1.012345)
>>>>>           
>>> => "1.01"
>>>       
>>>>> # ... or ...
>>>>>           
>>> ?> "%.2f" % 1.012345
>>> => "1.01"
>>>
>>> Hope that helps.
>>>
>>> James Edward Gray II
>>>
>>>
>>>       
>> That was fast! Thanks a lot.
>>
>>
>>
>>     
>
>