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JavaScript Math Rounding to a Decimal

aprillougheed
on
Medium Priority
763 Views
Last Modified: 2012-08-13
At URL below, I want to round the answer to 2 decimal places.

http://www.netafim-usa.com/calc/shrubclay.htm

Is this possible?

Thanks, April
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Commented:
Here's how I do:
i *= 100;
i = Math.round(i);
i /= 100;

Maybe there's some better way? I have no idea.

Martin

Commented:
martinag, why didn't you answer this one?  You provided a correct answer!
Of course those three statements can be conbined into one:
i= Math.round(i*100) / 100;

-Josh
Commented:
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Commented:
It's the only way that I have seen!
It's actually pretty simple as it is.  They probably figured it wasn't worth implementing a number of decimal places since it's so easy to get around it.
-Josh

Author

Commented:
I'm sure my question was understood.  I have a formula that returns a value like
4.44444444444
and I want it to return
4.44

How does the formula accomplish this?

Commented:
It translates 4.44444444444 to 444.444444444 by multiplying it by 100.  Then it rounds it normally to the nearest integer: 444, and then it divides by 100: 4.44

-josh

Author

Commented:
Thanks again Josh.

I really appreciate the extra explanation.


Commented:
Note:
55.5555 * 100 = 5555.55

Math.round(5555.55) returns 5556
5556 / 100 = 55.56

Math.round() rounds down if the first decimal is 4 or below, up if it is five or higher.

Martin
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