Function power

Examples/NoModules/Chapter 08/Ex8_16.cpp:16–21

Recursive function to calculate x to the power n

// Recursive function to calculate x to the power n
double power(double x, int n)
{
  if (n == 0)      return 1.0;
  else if (n > 0)  return x * power(x, n - 1);
  else /* n < 0 */ return 1.0 / power(x, -n);
}