I'm having trouble figuring out why subtraction of two floats are giving me a very small number. I'm thinking it has something to do with the internals of type casting, but i'm not sure. If anyone has seen this or can give me some suggestions, please.
I have 2 variables that go through a while loop and are added/subtracted/ multipled. InvAmt and InvPay are shown as floats but when they are subtracted, they give me a really small number
// code var_dump($InvAmt); var_dump($InvPay); var_dump($InvAmt-$InvPay);
// output float(18.49) float(18.49) float(2.1316282072803E-14)
Computers are not able to represent floating point numbers precisely. If you are doing financial stuff I would suggest using integer math and working completely in pennies.
-Rasmus
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