From: Captain Ishido <ishido7@...>
Date: 2013-07-31T03:51:08+09:00
Subject: Re: How to check an input IS an integer ?

Le 30/07/2013 12:55, sto.mar@web.de a écrit :
> Am 30.07.2013 12:03, schrieb Captain Ishido:
>> Hi everyone !
>> I have a little problem since a few days. I would like to check that my
>> user (I am writing a small program) had type an integer while I asked him.
> 
> There are several possibilities, the one I like best in this case
> is using a Regex (Note that user input is always a String):
> 
> 2.0.0p247 :005 > answer = '123'
>  => "123"
> 2.0.0p247 :006 > /\A[0-9]+\z/ === answer
>  => true
> 2.0.0p247 :007 > answer = '123abc'
>  => "123abc"
> 2.0.0p247 :008 > /\A[0-9]+\z/ === answer
>  => false
> 
> Other possibilities can easily be found by searching the archives,
> e.g. using Integer(), (which involves rescuing exceptions, which I
> do not like for this use case too much).
> 
> Regards,
> Marcus
> 
> 
I've found a 'solution'. I don't like it but *cough* it works.
If you're a REAL programmer, don't read.
-----------------------------------------------
# Let's do DIRTY things
# (Don't try do to this at home, kids !)
answer=""
answer=answer.to_i
while answer == 0 do
	puts "Please type an integer : "
	answer = readline.chomp
	answer=answer.to_i
end

-- 
Cordialement.
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