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Math.round() Method

This method rounds a number to its nearest integer.

Syntax

Math.round(number)

Returns

The integer closest in value to number.

Usage

The number parameter is rounded up if its fractional part is equal to or greater than 0.5 and is rounded down if less than 0.5. Both positive and negative numbers are rounded to the nearest integer.

Example

This code fragment yields the values 124 and -124.

var a = Math.round(123.6);
var b = Math.round(-123.6)
TheApplication().RaiseErrorText(a + "\n" + b)

NOTE:  Rounding may not be precise if you multiply or divide a value and then round it. Multiplication and division leads to precision loss.

Example

This code fragment illustrates precision loss due to multiplication.

var n = 34.855;
n = n* 100;
var r = Math.round(n)

The value of n is 3485.499999999999995 instead of 3485.5. When rounded this results in 3485 instead of 3486.

Example

This code fragment provides a workaround for the loss of precision due to multiplication.

var n = parseFloat(34.855);
n = parseFloat(n1b*100.0);
var r = Math.round(n);

See Also

Clib.modf() Method
ToInt32() Method
ToInteger() Method
ToUint16() Method
ToUint32() Method