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.

div performs floating-point division according to IEEE 754.

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Performing Arithmetic Operations

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