From: Farrel Lifson <farrel.lifson@...>
Date: 2007-05-23T23:34:48+09:00
Subject: Re: printing float to string with decimal rounding

On 23/05/07, Josselin <josselin@wanadoo.fr> wrote:
> I am trying to print a float result in a string but I can get it right
>
> I get float numbers like :
> distance =  0.2568915421 , 1.2568910001,  20.3256941254   (8 decimals)
>
> I wrote
>     d = (distance.*1000).round/1000.0     # to get something like  0.257
>     return "(- de 500m)" if d < 0.500
>     return "( - de 1km)" if d < 1.0
>     return "(env. " + d.to_s + " km)"
>
> if d > 1.0   i print   "env. 1.257 km"
> I'd like to print "env. 1.2 km"  shoudl I round it again ? or is there
> any DRY solution ?
>
> thanks
>
> joss

Kernel#format

Farrel