Create a C$++$ program enabling users to input a two$-$dimensional array. Subsequently, initialize the array by the user $($inside the main Function$)$ then implement three functions the call all of them inside the main function.

$1.$ Print$\_$Function : Print the largest element and the index of the largest element along with its corresponding value in the array.

$2.$ Average: Print the average of the entered array.

$3.$ Print$\_$Diagonal:Print the diagonal elements of the array only.

Important notes:

All Functions should be written bellow the main.

The dimension of the array $($row$,$ column$)$ should be initialized during the run time.