Re: Help. Floats turning into really small numbers? x.xxxxxxxxxxxxxxxxxxxxxxE-xx - Narrowed it down!

Ok i've narrowed it down a little bit but still can't figure it out.. Here's the code and what I get for the output. Does anyone know what's going on? Can someone else run it on their computer and see if they get the same results? <?php $a = "17.00" * "1"; $a+= "1.10" * "1"; $a+= "0.32" * "1"; $a+= "0.07" * "1"; print $a."<br>"; // 18.49 var_dump($a); // float(18.49) var_dump($a-18.49); // float(3.5527136788005E-15) ?> Anthony Tippett wrote: > I'm having trouble figuring out why subtraction of two floats are giving > me a very small number. I'm thinking it has something to do with the > internals of type casting, but i'm not sure. If anyone has seen this or > can give me some suggestions, please. > > I have 2 variables that go through a while loop and are > added/subtracted/ multipled. InvAmt and InvPay are shown as > floats but when they are subtracted, they give me a really small > number > > // code > var_dump($InvAmt); > var_dump($InvPay); > var_dump($InvAmt-$InvPay); > > // output > float(18.49) > float(18.49) > float(2.1316282072803E-14) >