ch-03-ex-01-solution.cpp
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	/*
	* chapter-03-exercise-01.cpp
	*
	* Print to file with a given precision
	*
	* Created on: Sep 2, 2012
	* Author: Radu Popescu <radu.popescu@epfl.ch>
	*/

	#include <fstream>
	#include <iostream>

	int main(int argc, char *argv[]) {
	double x[4] = {0.0, 1.0, 1.0, 0.0};
	double y[4] = {0.0, 0.0, 1.0, 1.0};

	std::ofstream output_file("x_and_y.dat");
	// Check that file is properly openened.
	if (!output_file.is_open()) {
	std::cout << "Error opening output file." << std::endl;
	return 1;
	}

	// Output in scientific format with 10 significant figures
	// and always showing sign
	output_file.setf(std::ios::scientific);
	output_file.setf(std::ios::showpos);
	output_file.precision(10);
	// Write x vector ending with a new line
	for (int i = 0; i < 4; ++i) {
	output_file << x[i] << " ";
	}
	output_file << "\n";
	// Flush after writing vector x
	output_file.flush();
	// Do the same for y vector
	for (int i = 0; i < 4; ++i) {
	output_file << y[i] << " ";
	}
	output_file << "\n";
	// Flush after writing vector y
	output_file.flush();
	// Close the file when finished
	output_file.close();

	return 0;
	}