arithmetic

+

Addition.

(+ 1 2 3 4 5) -> 15

-

Subtraction.

(- 7 5 2) -> 0

*

Multiplication.

(* 2 3) -> 6

/

Division.

(/ 15 3) -> 5
(/ 15 2) -> 15/2
(/ 15 2.0) -> 7.5

div

Integer division.

(div 15 3) -> 5
(div 15 2.0) -> 7.0
(div 15 2) -> 7
(div -15 2) -> -7

rem

Integer remainder.

(rem 15 2) -> 1
(rem -15 2) -> -1

mod

Modulo.

(mod 15 2) -> 1
(mod -15 2) -> 1