Daniel-Nikpayuk_SICP-Solutions/Chapter 1/1.3/exercise-1.30/exercise.lsp
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;; Copyright 2015 Daniel Nikpayuk
;;
;; This file is part of SICP Solutions.
;;
;; SICP Solutions is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License
;; as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
;;
;; SICP Solutions is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
;; of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License along with SICP Solutions. If not, see
;; <http://www.gnu.org/licenses/>.
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(define (sum-r term a next b)
 (if (> a b) 0
  (+ (term a) (sum-r term (next a) next b))
 )
)

(define (sum-i term a next b)
 (define (succ sum a)
  (if (> a b) sum
   (succ (+ sum (term a)) (next a))
  )
 )
 (succ 0 a)
)

(define (inc n) (+ n 1))
(define (id n) n)
(define (cube x) (* x x x))

