RE: [PHP] Math Weirdness - Can it be done with integers alone??

On Mon, 2008-07-14 at 21:09 +0100, Alex Chamberlain wrote: > [quote] > I don't quite understand your problem, but I use integers for any monetary > workings as you can guarantee it is accurate (obviously, you work in pence > or cents rather than GBP or USD). > > > > Alex > > > Hello Alex, > > I was reading through this thread, and I was curious about what methods you > use to handle fractions of a dollar and/or fractions of a penny if you are > always using integers. Do you only use a decimal for printing? do you > adjust all interest rates, etc...then as well? How about when interest > calculations result in fractions of pennies, how do you handle it then? > Basically, I can't see how it could be done with just integers alone? > > thanks > > dank > [/quote] > > To be honest, I haven't used it for any complicated use - shopping carts are > additive contraptions. However, I don't see the problem. > > 1) I use Smarty a lot - I use a plugin to format the integer to a price (ie > divide by 100 and display in 2 decimal places). So yes, I only put the > decimal place there to print. > > 2) Why do interest rates need to be changed?? Take £123.45 @ 5%. 123.45 * > 1.05 = (12345 [pennies] / 100) [pounds] * 1.05 = (12345 * 1.05) / 100 > Same calculation in my mind!! (Tell me if I have missed the point!!) > > 3) If you have a fraction of a penny - round it!! Surely, that's what the > banks do!! It's a penny!! Nope, banks can't round like that when calculating your daily interest :) Cheers, Rob. -- http://www.interjinn.com Application and Templating Framework for PHP