functions.h
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	#ifndef g
	#define g 127267.2 //Gravity, 9.82(3.6)^21000 in [km / hr^2]
	#endif
	#ifndef __FUNCTIONSH__
	#define __FUNCTIONSH__
	#include <iostream>
	#include <iomanip>
	#include <fstream>
	#include <cmath>
	#include <string>
	#include <sstream>
	using namespace std;

	void load_initial_data(double H,double HU,double HV,double Zdx,double *Zdy,
	string datapath,int nx,int Size,float Tend,int numElements,bool verbose);

	void load_initial_state(string filename, double * H, int numElements);

	void update_dt(const double H, const double HU,
	const double HV,double dt, double dx, int numElements);

	void cpy_to(double target, const double source, int numElements);

	int to_idx(int x, int y, int nx);

	void enforce_BC(double Ht, double HUt, double *HVt, int nx);

	void FV_time_step( double H, double HU, double *HV,
	const double Zdx, const double Zdy,
	const double Ht, const double HUt, const double *HVt,
	double C, double dt, int nx);

	void impose_tolerances(double Ht, double HUt, double *HVt, int numElements);

	void display(double *A, int nx);

	void read_parameters(string filename, int NX, int NTHREADS, int *VERBOSE,
	int *NTMAX);

	#endif