[ic] Screwey Math

[Russell Mann]

Hello,

IC 5.2, Fedora Core 1, Perl 5.8.4 built w/o threads.

Any idea why IC thinks

86.85 - 86.85 = 1.4210854715202e-14

And

46.9 - 46.9 = 7.105427357601e-15

This is a new feature, not sure why it started.  My code is for determining
when to tell someone they have a discount:

($totalretail is loaded with the total retail prices of the cart)

	[tmp discount_amount][calc]$totalretail-[subtotal
noformat=1][/calc][/tmp]
	[if scratch discount_amount > 0]
		[calc]$totalretail[/calc] - [subtotal noformat=1] = [scratch
discount_amount]
	[/if]

The output of the above code, depending on what is in the cart of course is
this:

86.85 - 86.85 = 1.4210854715202e-14

And

46.9 - 46.9 = 7.105427357601e-15

Ok, so technically 0.000000000000007105427357601 is greater than zero, but
also, technically, 46.9 minus 46.9 is not greater than zero.

Any ideas why my IC has lots its freakin mind?

Russell Mann