// For any doubt, feel free to comment.
I think that your bool isPalindromeR(string str) should be like this:-
bool isPalindromeR(string str) {
#FIXME
if(str.length()<=1) //Lines added
return true; // Lines added
int start = 0;
int end = str.length() - 1;
if(str.at(start) != str.at(end))
return false;
return isPalindromeR(str.substr(1,str.length()-2)); // Send
substring by deleting first and last character.
//helper recursive function that determines whether string is a
character-unit palindrome
}
When we use recursion then each function calls has its own local variables. So, your values of start and end will change in every recursive function call. So, to overcome this difficulty, we will send the string by deleting its first and last character by using str.substr() function. We delete the first and last character of current str because we have checked the palindrome condition for them and we don't have to check for it again.
And whenever str.length() is less than or equal to 1. Then str will be obviously palindrome so we return true.
If you have any further doubt, kindly ask in comments and I will try to reply asap.
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