http://qs321.pair.com?node_id=206259


in reply to Not a Number

This question seems to come round with the fall of the leaf. When I asked it last year I didn't realise that it was so interesting and complex. Now I know, though I admit part of me just wants to say, like Sir Roger de Coverley would if he'd had a Babbage Engine, "well come on, I mean to say dash it all, a thing's either a number or it's not, don't you know?"

George Sherston

Replies are listed 'Best First'.
Re: Re: Not a Number
by broquaint (Abbot) on Oct 18, 2002 at 11:17 UTC
    It may be a little late now but here's a funky little subroutine from merlyn that distinguishes between numbers and strings
    sub is_numeric { ($_[0] & ~ $_[0]) eq "0"; }
    The original post can be found here.
    HTH

    _________
    broquaint

      OK, what will your subroutine return for '1e+2'?..
      perltod() works fine.