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comp.lang.ruby

sprintf

Michael 'entropie' Trommer

12/22/2005 12:25:00 AM

Hello,

according ti the ruby core docu Kernel#sprintf:

> For string fields, the precision determines the maximum number of
> characters to be copied from the string. (Thus, the format sequence
> %10.10s will always contribute exactly ten characters to the result.)

my irb:

irb(main):004:0> sprintf("%2s", "lalaa")
=> "lalaa"
irb(main):005:0> sprintf("%2i", 1212)
=> "1212"

ruby 1.8.3 (2005-09-21) [i686-linux]

What s my mistake?

So long
--
Michael 'entropie' Trommer; http:/...

ruby -e "0.upto((a='njduspAhnbjm/dpn').size-1){|x| a[x]-=1}; p 'mailto:'+a"
2 Answers

Florian Frank

12/22/2005 12:43:00 AM

0

Michael 'entropie' Trommer wrote:

>irb(main):004:0> sprintf("%2s", "lalaa")
>=> "lalaa"
>irb(main):005:0> sprintf("%2i", 1212)
>=> "1212"
>
>ruby 1.8.3 (2005-09-21) [i686-linux]
>
>What s my mistake?
>
>
You didn't use a precision:

sprintf("%10.2s", "lalaa") # => " la"

This creates a size 10 string, left padded with spaces, and copies only
two characters from the argument.

sprintf("%10.2f", 1212.123) # => " 1212.12"

This creates a size 10 string, left padded with spaces, and displays the
floating point number with two decimal places.

--
Florian Frank

Michael 'entropie' Trommer

12/22/2005 12:50:00 AM

0

* Florian Frank (flori@nixe.ping.de) wrote:
> Michael 'entropie' Trommer wrote:
> >What s my mistake?

> You didn't use a precision:
>
> sprintf("%10.2s", "lalaa") # => " la"
> This creates a size 10 string, left padded with spaces, and displays the
> floating point number with two decimal places.

thanks alot.

So long
--
Michael 'entropie' Trommer; http:/...

ruby -e "0.upto((a='njduspAhnbjm/dpn').size-1){|x| a[x]-=1}; p 'mailto:'+a"