From: Matthew Feadler <matthew@...>
Date: 2005-12-23T07:35:43+09:00
Subject: Re: String > Integer Conversion Problem

Timothy Hunter wrote:
> That would be because Integer is never called. If there are no
> command-line arguments, ARGV is empty, there's nothing to map.

That makes perfect sense.  Thanks.

So, after some experimentation I've got the code listed below.  It 
successfully checks for:

1.) an empty ARGV (i.e., no command-line args)
2.) more than 2 arguments
3.) non-numeric arguments
4.) negative arguments
5.) first arg greater than second arg

Which is to say, it does everything I want it to.  However, I wonder if 
it can be optimized, condensed?

Here be code:

$usage = "Usage"

def print_usage val
  if val=="exit"
    print $usage
    exit
  else
    print $usage
  end
end

if ARGV!=[] and !(ARGV.length > 2)
  begin
    arg0, arg1 = ARGV.map{ |n| Integer(n) }
    if (arg0 < 0) or (arg1 < 0)
      print_usage("exit")
    elsif arg0>arg1
      print_usage("exit")
    end
  rescue ArgumentError
    print_usage("exit")
  end
else
  print_usage("exit")
end

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