Home >
Online Product Documentation >
Table of Contents >
Performing Arithmetic Operations
Performing Arithmetic Operations
In queries, a number represents a floating-point number. A number can have any double-precision 64-bit format IEEE 754 value. This includes
- A special not-a-number (NaN) value
- Positive and negative infinity
- Positive and negative zero
The numeric operators convert their operands to numbers as if by calling the
number() function. See
Converting an Object to a Number.
You can use the following arithmetic operators in queries:
-
+ performs addition
-
- performs subtraction
XML allows hyphens (
-) in names. Consequently, the subtraction operator (
-) typically needs to be preceded by white space. For example,
foo-bar evaluates to a node set that contains the child elements named
foo-bar. However,
foo
-
bar evaluates to the difference between the result of converting the string value of the first
foo child element to a number and the result of converting the string value of the first
bar child to a number.
-
* performs multiplication
-
mod returns the remainder from a truncating division. For example:
-
5 mod 2 returns
1.
-
5 mod -2 returns
1.
-
-5 mod 2 returns
-1.
-
-5 mod -2 returns
-1.
The
mod operator is the same as the
% operator in Java and ECMAScript. But it does not perform the same operation as the IEEE remainder operation, which returns the remainder from a rounding division.
Cart
