utility.h
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	/*
	============================================================================
	Filename : utility.h
	Author : Arash Pourhabibi, Hussein Kassir
	============================================================================
	*/
	#ifndef UTILITYH
	#define UTILITYH

	#include <time.h>
	#include <sys/time.h>
	#include <string.h>

	#define INIT_VALUE 1000
	#define x(i,j) x[(i)*length+(j)]

	struct timeval start, end;

	void set_clock()
	{
	gettimeofday(&start, NULL);
	}

	double elapsed_time()
	{
	gettimeofday(&end, NULL);
	double elapsed = (end.tv_sec - start.tv_sec);
	elapsed += (double)(end.tv_usec - start.tv_usec) / 1000000.0;
	return elapsed;
	}

	//Initialize the two-dimensional array
	void init(double *x, int length)
	{
	memset(x, 0, sizeof(double)lengthlength);
	x(length/2-1,length/2-1) = INIT_VALUE;
	x(length/2-1,length/2) = INIT_VALUE;
	x(length/2,length/2-1) = INIT_VALUE;
	x(length/2,length/2) = INIT_VALUE;
	}

	//Save the two-dimensional array in a csv file
	void save(double x, int length, const char outputfilename)
	{
	FILE *output_file;
	output_file = fopen(outputfilename,"w");
	for(int i=0; i<length; i++)
	{
	for(int j=0; j<length-1; j++)
	fprintf(output_file, "%.4g;", x(i,j));
	fprintf(output_file, "%.4g", x(i,length-1));
	fprintf(output_file, "\n");
	}
	fclose(output_file);
	}

	#endif