We have defined the parsing function for arithmetic expressions as (define (parse sexp) (cond [(number? sexp) (num sexp)] [(list? sexp) (case (first sexp) [(+) (add (parse (second sexp)) (parse (third sexp)))] [(-) (sub (parse (second sexp)) (parse (third sexp)))])]))Modify the above version of parsing an AE such that it will parse a WAE(Arithmetic Expression with substitution)
We have defined the parsing function for arithmetic expressions as (define (parse sexp) (cond [(number? sexp) (num sexp)] [(list? sexp) (case (first sexp) [(+) (add (parse (second sexp)) (parse (third sexp)))] [(-) (sub (parse (second sexp)) (parse (third sexp)))])]))Modify the above version of parsing an AE such that it will parse a WAE(Arithmetic Expression with substitution)
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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We have defined the parsing function for arithmetic expressions as
(define (parse sexp)
(cond
[(number? sexp) (num sexp)]
[(list? sexp) (case (first sexp)
[(+) (add (parse (second sexp)) (parse (third sexp)))]
[(-) (sub (parse (second sexp)) (parse (third sexp)))])]))Modify the above version of parsing an AE such that it will parse a WAE(Arithmetic Expression with substitution)
![We have defined the parsing function for arithmetic expressions as
(define (parse sexp)
(cond
[(number? sexp) (num sexp)]
[(list? sexp)
(case (first sexp)
[(+) (add (parse (second sexp)) (parse (third sexp)))]
[(-) (sub (parse (second sexp)) (parse (third sexp)))])]))
Modify the above version of parsing an AE such that it will parse a WAE(Arithmetic Expression with substitution)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb2c750ff-346a-49e6-a803-757635ba718c%2F51d5a04a-5d36-4947-a3be-78574960802c%2Fviymeji_processed.png&w=3840&q=75)
Transcribed Image Text:We have defined the parsing function for arithmetic expressions as
(define (parse sexp)
(cond
[(number? sexp) (num sexp)]
[(list? sexp)
(case (first sexp)
[(+) (add (parse (second sexp)) (parse (third sexp)))]
[(-) (sub (parse (second sexp)) (parse (third sexp)))])]))
Modify the above version of parsing an AE such that it will parse a WAE(Arithmetic Expression with substitution)
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