Javascript floats error?!

[jessj]

Please consider the following code:

var first = 345.50 + 0.001;
var second = 345.51 + 0.001;
var third = 345.52 + 0.001;
var fourth = 345.53 + 0.001;
var fifth = 345.54 + 0.001;

Why is the results of the second, third and fourth so very different from the first and fifth??

[jessj]

For the lazy, the results come out as:

First: 345.501
Second: 345.51099999999997
Third: 345.52099999999996
Fourth: 345.53099999999995
Fifth: 345.541

The big thing is, I want to cut the float down to two decimals. The normal divide-by/multiply-by method doesn't work the way I want it to, as it display the number "345.50" as "345.5"

[AutisticCuckoo]

Floating-point numbers are not exact, due to the way they are represented in memory. There'll almost always be rounding errors.

Try

var first = new Number(345.50 + 0.001);
alert(first.toFixed(2));

[jessj]

Seems to work much better!
Didn't know about the .toFixed() method. Thanks!