Return number closest to its argument.

Related Syntax Constructs

The following construct(s) refer to this construct:

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Syntax

fn:round(double? $number) => double?

Description

This function returns the number that is closest to $number. More precisely, fn:round(x) returns the same result as fn:floor(x + 0.5). If the argument is the empty sequence, it returns the empty sequence. If the argument is a literal, then the literal must be a valid lexical form of its type.

Argument

$number	double-precision number

Examples

• Call function with the numeric value 41.5:

  round(41.5E0)

  round(xs:double("41.7"))

  In both cases the double-precision number 4.2E1 is returned. In the first query the argument is a valid literal of the required type, in the second query the required type is constructed using the constructor function xs:double.

• Call function with the numeric value -273.15:

  round(-273.15E0)

  This query returns -2.73E2.