; ======================================================================
;
; Structure and Interpretation of Computer Programs
; (trial answer to excercises)
;
; 计算机程序的构造和解释(习题试解)
;
; created: code17 08/19/05
; modified:
; (保持内容完整不变前提下，可以任意转载)
; ======================================================================
;; SICP No.2.35
(define (count-leaves t)
(accumulate + 0 (map (lambda (x) (if (pair? x) (count-leaves x) 1)) t)))
;; Test-it:
;; Welcome to MzScheme version 209, Copyright (c) 2004 PLT Scheme, Inc.
;; > (count-leaves (list 1 2 (list 3 4 (list 5)) 6 (list 7 8)))
;; 8
