Power Function
==============

A common complaint about the standard C library is its lack of a function for calculating (small) integer powers. GSL provides a simple function to fill this gap. For reasons of efficiency, these functions do not check for overflow or underflow conditions.

int     gsl_sf_pow_int_impl(double x, int n, gsl_sf_result * result);
int     gsl_sf_pow_int_e(double x, int n, gsl_sf_result * result);
 -- Function: double gsl_sf_pow_int (double x, int n)

double gsl_sf_pow_2(const double x); double gsl_sf_pow_3(const double x); double gsl_sf_pow_4(const double x); double gsl_sf_pow_5(const double x); double gsl_sf_pow_6(const double x); double gsl_sf_pow_7(const double x); double gsl_sf_pow_8(const double x); double gsl_sf_pow_9(const double x);

     #include <gsl_sf_pow_int.h>
     double y = gsl_sf_pow_int(3.0, 12)