Write a C++ function to find out the average of an integer array and return to the main function.

Hello, I am having trouble with this homework question for my course for intro to c++. Topic is on Array 2, Write a function definition for a function named getPrev which does the following: 1) Accepts the array, size of the array and value as parameters. 2) Returns the value previous to a specified value in an integer array. If the specified value is the first element in the array, return -1. Example Given the array {10, 20, 30, 40, 50, 60}. Given the value 30, the getPrev function returns the value 20 which is the value previous to 30.