// Dr. Ramsey
#include <iostream>
using namespace std;

//function prototype
double my_power(double x, int n);
void input(double &x, int &n);

int main()
{
  double xin;
  int nin;
  input(xin,nin);
  cout << my_power(xin,nin) << endl;


  return 0;
}


void input(double &x, int &n)
{
  cout << "Please input a real value x for x^n: ";
  cin >> x;
  cout << "Please input a positive integer value n for x^n: ";
  cin >> n;

  //disallow negative values in the input?
  /*  while( n < 0)
    {
      cout << "Error: please input a positive integer: ";
      cin >> n;
    }
  */



}


//a function that raises a double x to the power of n
double my_power(double x, int n)
{
  //some recursive functions have a case to catch invalid input
  if(n < 0)
    {
      cout << "Error to my_power, n < 0" << endl;
      return 0; // "bogus" return value for error case
    }

  //all recursive functions have at least one base case
  if(n == 0)
    return 1;

  //all recursive functions have at least one case where the function
  //calls itself
  return x * my_power(x,n-1);

}