Please write the correct C++ function and main

Definition: A palindrome is a sequence that reads the same backwards as it does forwards. Hence, 101, 120021, and 1 are all numerical palindromes. The number 1234 is NOT a palindrome. A palindrome array would be of the form [-1,2,2,-1] for example. Given an array of integers, write a function to calculate the sum of the elements if it is a palindrome array. If it is not a palindrome array, your function must return -2. Your function must call separate functions to check whether or not the array is a palindrome and to calculate the sum of its elements. If the length is Oor negative each function must return -1 or false as its result. The function must be placed in a file named function-2-3.cpp. You must also write a main function and place it in a file named main-2-3.cpp. Signature: int sum_if_a_palindrome (int integers[], int length) Signature: bool is_a_palindrome (int integers[], int length) Signature: int sum_elements(int integers[], int length)