From: Robert Klemme <shortcutter@...>
Date: 2007-05-23T23:34:57+09:00
Subject: Re: printing float to string with decimal rounding

On 23.05.2007 16:24, Josselin 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 ?

Is this good enough?

irb(main):010:0> "%.2f" % 1.000
=> "1.00"
irb(main):011:0> "%.2f" % 1.005
=> "1.00"
irb(main):012:0> "%.2f" % 1.006
=> "1.01"

Your values

irb(main):007:0> [0.2568915421 , 1.2568910001,  20.3256941254].map {|f| 
"%10.2f" % f}
=> ["      0.26", "      1.26", "     20.33"]
irb(main):008:0> [0.2568915421 , 1.2568910001,  20.3256941254].map {|f| 
"%.2f" % f}
=> ["0.26", "1.26", "20.33"]

Kind regards

	robert