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d. Problem 4. Devise a function that receives a string and determines if it is a palindrome. Make the function evaluate palindromes in a case insensitive way. So, the input "Able was I ere I saw Elba" should count as a palindrome.

d. Problem 4. Devise a function that receives a string and determines if it is a palindrome. Make the function evaluate palindromes in a case insensitive way. So, the input "Able was I ere I saw Elba" should count as a palindrome.

Database System Concepts
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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d. Problem 4. Devise a function that receives a string and determines if it is a palindrome. Make the function evaluate palindromes in a case insensitive way. So, the input "Able was I ere I saw Elba" should count as a palindrome. Approach: Let's assume the signature of our function is palindrome(s) where s is the input string. In the body of your function, check if the length of s is less than 2. If so, just return true because a string containing one letter is the same backwards and forwards. If length of s is greater than 2, take the first and last letters off of the string and determine if they are equal. If not, return false. But if they are equal, recursively call palindrome on the sub-string of s that excludes both the first and last character. That means the length of the new string should be two characters less than that of the original string. Writing any explicit loop in your code results a 0 for this question. Remember to provide pre- and post- conditions. Now copy/paste the following trace table in your Word file and trace your function palindrome (s) for when s is initially "racecar". As a guideline, we have populated the tables with the values for the first call and the corresponding returned values for each of those calls. As ever, the first table is populated top down (i.e. time elapses from row x torow x+1) whereas the returned value table is populated bottom-up (i.e. time elapses from row x to row x-1). You may want to use debugging features console.log to observe these values as your program runs. call# S 1 "racecar" 2 "aceca" value returned to this call TRUE TRUE
Transcribed Image Text:d. Problem 4. Devise a function that receives a string and determines if it is a palindrome. Make the function evaluate palindromes in a case insensitive way. So, the input "Able was I ere I saw Elba" should count as a palindrome. Approach: Let's assume the signature of our function is palindrome(s) where s is the input string. In the body of your function, check if the length of s is less than 2. If so, just return true because a string containing one letter is the same backwards and forwards. If length of s is greater than 2, take the first and last letters off of the string and determine if they are equal. If not, return false. But if they are equal, recursively call palindrome on the sub-string of s that excludes both the first and last character. That means the length of the new string should be two characters less than that of the original string. Writing any explicit loop in your code results a 0 for this question. Remember to provide pre- and post- conditions. Now copy/paste the following trace table in your Word file and trace your function palindrome (s) for when s is initially "racecar". As a guideline, we have populated the tables with the values for the first call and the corresponding returned values for each of those calls. As ever, the first table is populated top down (i.e. time elapses from row x torow x+1) whereas the returned value table is populated bottom-up (i.e. time elapses from row x to row x-1). You may want to use debugging features console.log to observe these values as your program runs. call# S 1 "racecar" 2 "aceca" value returned to this call TRUE TRUE
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