Hello, can anyone help me with this C++ problem?

11. Create a recursive function that is able to sum up every element via an odd subscript through an integer array.

Make sure the function can accept any size of an array.

Make sure you can return the sum from the function.

Create a recursive function able to display a string in reverse order.

It is important to notice that each character of a string may be accessed through bracket notation or using the at() function.

Incorporate default arguments in order for the function to be called with a single string argument.

Create a main driver function that tests both of the recursive functions.