From: 7stud -- <bbxx789_05ss@...>
Date: 2007-10-26T02:53:51+09:00
Subject: Re: Change a string to an integer, report an error if the string does not represent an integer?

7stud -- wrote:
>   str.each_byte do |char|
>     if start
>       start = false
>       if char == ?+ or char == ?-
>         next
>       end
>     end
> 
>     if char < ?0 or char > ?9
>       return false
>     end
>   end
> 
>   return true
> end
> 
> strings = ['0013abc', '0025', '-0030', '+051', '00-1', '-abc72']
> strings.each do |str|
>   if valid_int?(str)
>     puts str.to_i
>   else
>     puts 'invalid int'
>   end
> end


--output:--
invalid int
25
-30
51
invalid int
invalid int
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