Please write the correct C++ function and main

Given a binary number represented as an array, write a function that takes the array and its size as a parameter, and returns the integer value. You may assume that there are at least 1 and no more than 30 numbers in the array and that all the values are either 0 or 1. The array is ordered with most significant binary digit at the start (index 0) and the least significant digit at the end. The function must be placed in a file named function-2-2.cpp. You must also write a main function and place it in a file named main-2-2.cpp. Signature: int binary_to_number(int binary_digits[], int number_of_digits)