(define (^ base exponent)
  (define (*^ exponent acc)
    (if (= exponent 0)
        acc
        (*^ (- exponent 1) (* acc base))))
  (*^ exponent 1))

(display (^ 2 3))
(newline)
(display (^ (/ 1 2) 3))
(newline)
(display (^ 0.5 3))
(newline)
(display (^ 2+i 3))
(newline)