Network Security Tools

Arithmetic Operators

Here are the common arithmetic operators:

+

Used to add numbers. It can also be used to perform string concatenation.

-

Used to perform subtraction. It can also be used to perform string subtraction. For example, 'cat, dog, mouse' - ', dog' results in the string 'cat, mouse‘.

*

Used to multiply numbers.

/

Used to divide numbers. Note that NASL will return a 0 if you try to divide by zero.

%

Used to perform a modulo operation. For example, 10%3 computes to 1.

**

Used to perform exponentiation. For example, 2**3 computes to 8.

++

Used to increment a variable’s value by 1. When a variable is prefixed by this operator (example: ++c), its value is incremented before it is evaluated. When a variable is post-fixed by this operator (example: c++), its value is incremented after it is evaluated.

—

Used to decrement a variable’s value by 1. When a variable is prefixed by this operator (example: --c), its value is decremented before it is evaluated. When a variable is post-fixed by this operator (example: c--), its value is decremented after it is evaluated.