Here's how the round() method is in the source <pre> public static int round(float a) { return (int)floor(a + 0.5f); } </pre> And here's what the floor method does(since it's native refer to API) <pre> floor public static double floor(double a) Returns the largest (closest to positive infinity) double value that is not greater than the argument and is equal to a mathematical integer. Parameters: a - a double value. a - an assigned value. Returns: the largest (closest to positive infinity) double value that is not greater than the argument and is equal to a mathematical integer. </pre> So to estimate the rounded off value we add 0.5 to our number & then get the largest double value that is not greater than the argument & is equal to a maths integer . For instance Math.round(-5.49f) Add 0.5 ---> -5.49 + 0.5 = -4.99 Get the largest double value that's a maths integer but not greater than the argument ----> -5 So , Math.round(-5.49) = -5

Correct me if I'm wrong ( First time i've looked at the source) Ashish [This message has been edited by Ashish Hareet (edited July 29, 2001).]

For round() method, any number falling inside -5.5(inclusive)~-5.0 will get -5.0 any number falling inside +5.5(inclusive)~+6.0 will get +6.0 notice that the result is to positive x axis direction. similarly, any number falling inside -6.0~-5.5(exclusive) will get -6.0 any number falling inside +5.0~+5.5(exclusive) will get +5.0 notice that the result is to negative x axis direction. Hope it helps. Guoqiao

[This message has been edited by Guoqiao Sun (edited July 29, 2001).]

Guoqiao Sun<br />SCJP2 SCWCD2<br />Creator of <a href="http://www.jiris.com/" target="_blank" rel="nofollow">www.jiris.com</a>, Java resource, mock exam, forum

Hi, the round meth returns an int or long depending whether u pass a float or double as the argument.It adds 0.5 to the argument and returns the int closest to it.So -5.49 will return -5 and -5.7 will return -6.

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