ex2.cc
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	#include <cstdlib>
	#include <string>
	#include <vector>
	#include <algorithm>
	#include <cmath>
	#include <fstream>
	#include <sstream>
	#include <iomanip>
	#include <iostream>
	/* -------------------------------------------------------------------------- */

	void write(const char * filename, double x, double y, double z) {
	// write 3D point to file
	std::ofstream fout(filename);
	std::cout << "Writing coordinates (" << x << ", " << y << ", " << z <<
	") into " << filename << std::endl;
	fout << x << " " << y << " " << z;
	fout.close();
	}

	void read(const char * filename) {
	// read 3D point from file
	std::ifstream fin(filename);
	std::stringstream ss;
	ss << fin.rdbuf();
	double x, y, z;
	ss >> x >> y >> z;
	std::cout << "Reading coordinates from " << filename << ": (" <<
	x << ", " << y << ", " << z << ")" << std::endl;
	}

	int main(int argc, char ** argv){

	const char* filename = "toto.txt";
	double x, y, z;
	if (argc == 4) { // x, y, z provided
	x = atof(argv[1]);
	y = atof(argv[2]);
	z = atof(argv[3]);
	} else if (argc == 1) { // x, y, z not provided
	x = 1.7;
	y = 1.0;
	z = 2.0;
	} else {
	std::cout << "\033[31m" << "Invalid number of arguments: " << argc <<
	"\033[0m" << std::endl;
	return 0;
	}

	write(filename, x, y, z);
	read(filename);

	return EXIT_SUCCESS;
	}