C++ Needs to Build and Run please!

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 powerTwo(int n);

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[], int length);