Consider the following Scheme program: (define (mystery W) (cond ( (number? W) '()) ( (number? (car W)) (cdr W)) (else (cons (mystery (car W)) (cdr W))) ))

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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3.
Consider the following Scheme program:
(define (mystery W)
(cond
( (number? w) '())
( (number? (car W)) (cdr W))
(else (cons (mystery (car W)) (cdr W)))
Note that number? is a built-in predicate that returns true if its argument is a number and
false otherwise.
What does the above Scheme fumetion x do? | 13 Ja a3 %
判断品孤小是否为动发字
a.
b.
What is the result of the following calls:
(mystery (9 8 (2 4) (4 5))))
(mystery (( (5 3) (8)) (4)))
Transcribed Image Text:3. Consider the following Scheme program: (define (mystery W) (cond ( (number? w) '()) ( (number? (car W)) (cdr W)) (else (cons (mystery (car W)) (cdr W))) Note that number? is a built-in predicate that returns true if its argument is a number and false otherwise. What does the above Scheme fumetion x do? | 13 Ja a3 % 判断品孤小是否为动发字 a. b. What is the result of the following calls: (mystery (9 8 (2 4) (4 5)))) (mystery (( (5 3) (8)) (4)))
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