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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.
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