C++ Needs to Build and Run PLease!

3. Given an integer n> 0, write a recursive C++ function prints the digits of a positive integer in reverse order. Using following function header: void ceverseDig(int n); 4. Write a recursive function that receives an positive integer n and returns the nth power of 2. For example, if the function receives 5, then the return value of the function will be 32. Using following function header: int powerIwolint n), 5. Write a recursive function that receives an integer array along with its length (the number of elements in the array) and then returns minimum of the numbers in the array. Using following function header: int min int a[l, int length)