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RE: RE: Re: Minor query

by turnstep (Parson)
on Jun 25, 2000 at 00:01 UTC ( [id://19734]=note: print w/replies, xml ) Need Help??


in reply to RE: Re: Minor query
in thread Minor querry!!

All these loops are so long! Labels and status variables and chomping, oh my!

How about this: 

{
  print "Number?\n";
  redo unless <STDIN> =~ /^\d+$/;
}

[download]

Or, to save the value (which can be useful :) 

{
  print "Number?\n";
  redo unless <STDIN> =~ /^(\d+)$/ and $number=$1;
}

[download]

But my personal favorite would be simply: 

print "Number?\n" while <STDIN> !~ /^\d+$/;

[download]

Replies are listed 'Best First'.
RE: RE: RE: Re: Minor query
by merlyn (Sage) on Jun 25, 2000 at 16:58 UTC
    And turnstep said:
    But my personal favorite would be simply: 
    print "Number?\n" while <STDIN> !~ /^\d+$/;

    [download]
    Of course, you'll not have the number you read, unless you look at $& (expensive) or put \d+ inside parens, and then look at $1.

    -- Randal L. Schwartz, Perl hacker

[reply]
[d/l]

      Yes, I meant to add a: 

      $number = $&;

      [download]
      which would be expensive, but considering that the script must stop for user input with the STDIN, probably not a big deal in this case. Parens would be smoother, but make the initial statement larger. IMO, of course. :)

[reply]
[d/l]

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