Writter.cpp
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	/**
	* @file Writter.cpp
	* @author Sergio Hernandez
	* This file is part of the Conjugate Gradient Project
	*
	* This class writes the final results in file.
	*
	*/
	#include <cstring>
	#include "Writter.hpp"

	void Writter::writePositionsText(std::string fileName, int id, std::vector<Particle> particles){
	//We write the current state of particles in a text file
	//Each row will have the state for a particle r
	//The format is: pos_x \t pos_y \t pos_z
	//The name of the file contains: -state_i (the time for which the name is written - n_particles (the number of particles)

	FILE* saveFile;

	char bufX[20];
	char bufY[20];
	char n0[100], n1[50], n2[50], n3[50];
	int i;
	int n = particles.size();

	//Prepare the name of the file
	if(id==0) {
	strcpy(bufX, "initial");
	}
	else if(id==1){
	strcpy(bufX, "final");
	}
	else{
	std::string s = std::to_string(id);
	strcpy(bufX, s.c_str());
	}
	sprintf(bufY, "%d", n);
	strcpy(n0, fileName.c_str());
	strcpy(n1, "_state_");
	strcpy(n2, "_");
	strcpy(n3, ".dat");
	strcat(n0, n1);
	strcat(n0, bufX);
	strcat(n0, n2);
	strcat(n0, bufY);
	strcat(n0, n3);

	//Opens the file
	saveFile = fopen(n0, "w");


	if(!(saveFile=fopen(n0, "w"))) {
	fprintf(stderr, "Problem opening file %s\n", n0);
	exit(0);
	}

	//Writes in the file
	for (auto &particle: particles) {
	fprintf(saveFile, "%f \t %f \t %f \n", particle.getX(), particle.getY(), particle.getZ());
	}

	//Closes the file
	fclose(saveFile);

	}