Program in C++ please.

Write a function that checks if given a string is a palindrome or not. (Note: String characters can be accessed by using index numbers. i.e. if string str = Hello, then str[0] is H, str[1] is e, str[2] is l, . Hint: include to use str.length() function to get string length)

Function prototype is given below:

bool isPalindrome (string str);