``p480.h''

Programs which we write to call upon our routines will need to know the function prototypes to call them properly. To ensure this, you should create a file ``p480.h'' which contains just the function prototypes for all of the routines in ``p480.c''. Each time we add a new routine to ``p480.c'' you should include it's prototype here! At present, this file should read just

double trapint(double f[],double x[],double dx[],int N);
double simpint(double f[],double x[],double dx[],int N);

void rk4p480(double y[], double dydx[], int n, double x, double h, double yout[],
             void (*derivs)(double, double [], double [], 
                            int, double [], double [], double [], int),
             int k, int dk, double f[], double r[], double dr[], int N);