Re: Math Problem

McKirahan <News (AT) McKirahan (DOT) com> wrote

How do I add floating point numbers accurately?

The following adds the 4 numbers
46.57, 45.00, 45.00, and 54.83 to give
191.39999999999998 instead of 191.40.

If you happen to be handling money, it's preferable to avoid floating point calculations by working in pennies, then
formatting the result.

var pennies=12305

var dollars=Math.floor( pennies / 100 ), cents = pennies % 100;

result = dollars + '.' + ((cents < 10) ? ('0' + cents) : cents);

--
S.C.