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

**Table 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).

Note:Remainder$a % $bis negative for negative$a.

See also the manual page on Math functions.