(assert= 3 (+ 3))
(assert= 6 (+ 1 2 3))
(assert= 0 (+))

(assert= -3 (- 3))
(assert= 4 (- 7 3))
(assert= -4 (- 1 2 3))
(assert= 0 (-))

(assert= 1 (*))
(assert= 2 (* 2))
(assert= 14 (* 2 7))

(assert= 1 (/))
(assert= 0 (/ 5))
(assert= 2 (/ 5 2))
(assert= 6 (/ 18 3))

(assert= 1 (%))
(assert= 3 (% 7 4))

(assert= 1 (^))
(assert= 128 (^ 2 7))

(assert= 8 (* 2 (+ 1 3)))