Arithmetic Operators

Remember basic arithmetic from school? These work just like those.

???? 15-2. Arithmetic Operators

Example	Name	Result
-$a	Negation	Opposite of $a.
$a + $b	Addition	Sum of $a and $b.
$a - $b	Subtraction	Difference of $a and $b.
$a * $b	Multiplication	Product of $a and $b.
$a / $b	Division	Quotient of $a and $b.
$a % $b	Modulus	Remainder of $a divided by $b.

The division operator ("/") returns a float value anytime, even if the two operands are integers (or strings that get converted to integers).

????: Remainder $a % $b is negative for negative $a.

See also the manual page on Math functions.