说明：  微积分的数值计算函数，包括： double composite_simpson(double(*f)(double),double a,double b,int n) double romberg(double(*f)(double),double a,double b,double eps,int max_it) double gauss_legendre(double(*f)(double),double a,double b) double central_difference(double(*f)(double),double a, double h,double eps, int max_it) double runge_kuta(double(*f)(double,double),double x[],double y[],double h,int n) double proved_euler(double(*f)(double,double),double x[],double y[],double h,int n) double adams(double(*f)(double,double),double x[], double y[],double h,int n) double montecar(double(*f)(double),double a,double b,double ub,double eps,int k,int n) float uniform_random()
(calculus numerical calculation functions, including : double composite_simpson (double (* f) (double), a double, double b, int n) double Romberg (double (* f) (double), a double, double b, double eps, int max_it) double gauss_legendre (double (* f) (double), a double, double b) double central_difference (double (* f) (double), a double, double h, double eps , int max_it) double runge_kuta (double (* f) (double, double), double x [], [] y double, double h, int n) double proved_euler (double (* f) (double , double), double x [], [] y double, double h, int n) double adams (double (* f) (double, double), double x [], [] y double, double h, int n) montecar double (double (* f) (double), a double, double b, double ub, double eps, int k, int n) float uniform_random ())