Q8: Substitute Write a procedure substitute that takes three arguments: a list s, an old word, and a new word. It returns a list with the elements of s, but with every occurrence of old replaced by new, even within sub-lists. Hint: The built-in pair? predicate returns True if its argument is a cons pair. Hint: The operator will only let you compare numbers, but using equal? or eq? will let you compare symbols as well as numbers. For more information, check out the Scheme Built-in Procedure Reference. (define (substitute s old new) 'YOUR-CODE-HERE
Q8: Substitute Write a procedure substitute that takes three arguments: a list s, an old word, and a new word. It returns a list with the elements of s, but with every occurrence of old replaced by new, even within sub-lists. Hint: The built-in pair? predicate returns True if its argument is a cons pair. Hint: The operator will only let you compare numbers, but using equal? or eq? will let you compare symbols as well as numbers. For more information, check out the Scheme Built-in Procedure Reference. (define (substitute s old new) 'YOUR-CODE-HERE
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
Problem 1PE
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Transcribed Image Text:Q8: Substitute
Write a procedure substitute that takes three arguments: a list s, an old word, and a
new word. It returns a list with the elements of s, but with every occurrence of old
replaced by new, even within sub-lists.
Hint: The built-in pair? predicate returns True if its argument is a cons pair.
Hint: The operator will only let you compare numbers, but using equal? or eq? will
let you compare symbols as well as numbers. For more information, check out the
Scheme Built-in Procedure Reference.
(define (substitute s old new)
'YOUR-CODE-HERE
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