# [racket] Formatting reals

+10! Using just ~r can get close, but ...well...
>* (~r (- pi) #:min-width 12 #:precision 6)
*"- 3.141593"
Pierpaolo Bernardi <olopierpa at gmail.com> writes:
>* Hello,
*>*
*>* suppose I want to format a real number, with a fixed number of digits
*>* after the comma, rigth-padded in a given width, and I want the sign to
*>* be attached to the digits (i.e. not what ~r does).
*>*
*>* This is the usual way of printing reals in a table, and can be done
*>* trivially using standard functions in any other language I can think
*>* of.
*>* In scheme it can be done using srfi/48.
*>*
*>* Yet I could find no way of doing this easily using Racket libraries.
*>* Am I missing something?
*>*
*>* I want the following:
*>*
*>>* (require srfi/48)
*>>* (format "~12,6F" (- pi))
*>* " -3.141593"
*>*
*>* The best I could do is:
*>*
*>>* (~a (~r (- pi) #:precision 6) #:width 12 #:align 'right)
*>* " -3.141593"
*>*
*>* which is a PITA.
*>*
*>* (I have used srfi/48 till now, but I was trying to convert to Racket
*>* libraries in an attempt to reduce bloat.)
*>*
*>* Cheers
*>* P.
*>* ____________________
*>* Racket Users list:
*>* http://lists.racket-lang.org/users
*