Gotcha. Thanks to all who responded!
-----Original Message-----
From: Jonathan E. Paton [mailto:[EMAIL PROTECTED]]
Sent: Thursday, May 23, 2002 9:10 AM
To: [EMAIL PROTECTED]
Subject: Re: Strange total from adding 2 numbers
> Why is the addition of the numbers -67947269.62 and
> 68288455.49, both with only 2 numbers after the decimal,
> resulting in 341185.86999996 where there are 8 numbers
> after the decimal. I would expect the number to simply
> be 341185.87. How can I avoid this strange behavior?
Because "floating point" representation is basically
scientic notation:
68288455.49 = 6.828845549 X 10^7
^^^^^^^^^^^ ^^^^
Mantasia Exponenent
And there often isn't a direct mapping between the binary
representation used and our decimal system. This leads to
minor errors, which you need to remember - especially when
comparing equality (which you should NEVER do with floating
point).
The behaviour isn't strange, unless you weren't expecting
it. The correct thing to do is to remake the number into
a pure integer, and here is one way to do it:
$number =~ s/\.//; #removes the dot!
as long as you always have two digits. Work always in
integers if errors matter.
Jonathan Paton
=====
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