Sprintf

ruby-talk
1

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?

Reading comprehension? =)

sprintf("%2.2s","lalaa")
    ==>"la"

You can't do the equivalent for a number (as the precision setting for a
number specifies decimal places).

···

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2

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

What s my mistake?

Daniel Sheppard wrote:

sprintf("%2.2s","lalaa")
    ==>"la"

u can't do the equivalent for a number (as the precision setting for a
number specifies decimal places).

You _can_ do the equivalent for a number two ways that I can think of:

sprintf("%i", 1212 % 10**2) #=> "12" # modular arithmetic to truncate high
digits
sprintf("%.2s", 1212) #=> "12" # cast integer to string

Also, I usually like using String#% instead of sprintf, just in case you're
not familiar with it:

"%.2s" % 1212 #=> "12"

Cheers,
Dave

3

i wasnt familiar with it, quite impressive!

So long

···

* Dave Burt (dave@burt.id.au) wrote:

Also, I usually like using String#% instead of sprintf, just in case you're
not familiar with it:

"%.2s" % 1212 #=> "12"

--
Michael 'entropie' Trommer; http://ackro.org

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