Sprintf

Ruby
1

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://ackro.org

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

2

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.

3

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://ackro.org

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