Palindrome Testing Program Plan: Include the required header files to the program. Declare function prototype. Define the “main()” function. Inside this function, Do until the user enters “ENTER” key using “while” condition. Get a word from the user and store it in a variable “word”. Check if the entered word is empty. If the condition is true then, return 1. Call the function “isPalindrome()” and check if the function returns “true”. If the function returns true then, the entered word is a palindrome. Else, the entered word is not a palindrome. Return the statement. Give function definition for “isPalindrome()”. Check if the value of “lower” is greater than “upper”. Return “true”. Check if the first and the last characters are not equal. Return “false”. Return and call the function “isPalindrome()” recursively.

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Chapter 14, Problem 8PC

Program Plan Intro

Palindrome Testing

Program Plan:

Include the required header files to the program.

Declare function prototype.

Define the “main()” function. Inside this function,

Do until the user enters “ENTER” key using “while” condition.

Get a word from the user and store it in a variable “word”.

Check if the entered word is empty.

If the condition is true then, return 1.

Call the function “isPalindrome()” and check if the function returns “true”.

If the function returns true then, the entered word is a palindrome.

Else, the entered word is not a palindrome.

Return the statement.

Give function definition for “isPalindrome()”.

Check if the value of “lower” is greater than “upper”.

Return “true”.

Check if the first and the last characters are not equal.

Return “false”.

Return and call the function “isPalindrome()” recursively.

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3. A palindrome is a sentence that contains the same sequence of letters read-ing it either forwards or backwards. A classic example is "Able was I, ere I saw Elba." Write a recursive function that detects whether a string is a palindrome. The basic idea is to check that the first and last letters of the string are the same letter; if they are, then the entire string is a palindrome if everything between those letters is a palindrome. There are a couple of special cases to check for. If either the first or last character of the string is not a letter, you can check to see if the rest of the string is a palindrome with that character removed. Also, when you compare letters, make sure that you do it in a case-insensitive way. Use your function in a program that prompts a user for a phrase and then tells whether or not it is a palindrome. Here's another classic for testing: "A man, a plan, a canal, Panama!"

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