Please write in C++

1. Write a C++ program that does the following. a. In the main, declare an array of size 15 of a type "integer". (10 points) b. Write a function that allows user to enter values into the declared array (Step a). (15 points) c. Write a function to that calculates the mean (the average) of the declared array (Step a) and returns the mean to the main to be displayed on the console. (20 points) i. Use forward declaration for this function. (5 points) d. Write a function that finds the lowest value of the declared array (Step a) and returns the lowest value found to main to be displayed on the console ( 20 points) i. Use forward declaration for this function. (5 points) e. Write a function that finds the highest value of the declared array (Step a) and returns the highest value found to main to be displayed on the console ( 20 points) i. Use forward declaration for this function. (5 points) 2. The program runs as expected without any issues. ( 25 points)