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Re: Re: (Golf) Formatting Integer To Money

by dpuu (Chaplain)
on Aug 29, 2002 at 17:41 UTC ( [id://193837]=note: print w/replies, xml ) Need Help??

in reply to Re: (Golf) Formatting Integer To Money
in thread (Golf) Formatting NumberTo Money

49 Characters:
sub a{$_=sprintf"%.2f",pop;while(s/\B\d{3}\b/,$&/){}$_}
Update: 48 characters:
sub a{$_=sprintf"%.2f",pop;{s/\B\d{3}\b/,$&/&&redo}$_}

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Re: Re: Re: (Golf) Formatting Integer To Money
by thelenm (Vicar) on Aug 29, 2002 at 18:45 UTC
    Here's a 44 with a few small improvements to yours:
    sub a{$_=sprintf"%.2f",@_;1while s/\B...\D/,$&/;$_}
    It seems that the sprintf solutions fail sometimes in rounding, e.g. "123456789012345.125" becomes "123,456,789,012,345.12" instead of "123,456,789,012,345.13".

    Update: I was just informed by thospel++ that IEEE rounding is toward even, not upward. That explains the behavior, though I'm not sure if it's the desired behavior for this problem.

    -- Mike


      Actually, this is the expected rounding. If you think about it, only half of them should round up (and the other half down) since that will give a more accurate average. In this case .125 rounds down, if you try .135 it will round up and .145 will round down.
      perl -le "s,,reverse killer,e,y,rifle,lycra,,print"

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