// This program uses an fstream object to write data to a file.
#include<iostream>
#include<fstream>
#include<iomanip>  // Used by function:  setprecision()

using namespace std;

// Function Headers
int demofile_out_app();
int setprecision();
int writeThreeRows();

int main()
{
	fstream dataFile;

	cout << "Opening file...\n";
	dataFile.open("../Files/demofile.txt", ios::out);	// Open for output
	cout << "Now writing data to the file.\n";
	dataFile << "Jones\n";						// Write line 1
	dataFile << "Smith\n";						// Write line 2
	dataFile << "Willis\n";						// Write line 3
	dataFile << "Davis\n";						// Write line 4
	dataFile.close();							// Close the file
	cout << "Done.\n";

    //  Call functions (headers defined above main and body defined below main)
	int x = demofile_out_app();
	int y = setprecision();
	int z = writeThreeRows();

	return 0;
}

int demofile_out_app()
{
	ofstream dataFile;

	cout << "Opening file...\n";
	// Open the file in output mode.
	dataFile.open("../Files/demofile.txt", ios::out);
	cout << "Now writing data to the file.\n";
	dataFile << "Jones\n";						// Write line 1
	dataFile << "Smith\n";						// Write line 2
	cout << "Now closing the file.\n";
	dataFile.close();							// Close the file

	cout << "Opening the file again...\n";
	// Open the file in append mode.
	dataFile.open("./Files/demofile.txt", ios::out | ios::app);
	cout << "Writing more data to the file.\n";
	dataFile << "Willis\n";						// Write line 3
	dataFile << "Davis\n";						// Write line 4
	cout << "Now closing the file.\n";
	dataFile.close();							// Close the file

	cout << "Done.\n";
	return 0;
}

// This program uses the setprecision and fixed
// manipulators to format file output.
int setprecision()
{
	fstream dataFile;
	double num = 17.816392;

	dataFile.open("../Files/numfile.txt", ios::out);		// Open in output mode

	dataFile << fixed;				// Format for fixed-point notation
	dataFile << num << endl;		// Write the number

	dataFile << setprecision(4);	// Format for 4 decimal places
	dataFile << num << endl;		// Write the number

	dataFile << setprecision(3);	// Format for 3 decimal places
	dataFile << num << endl;		// Write the number

	dataFile << setprecision(2);	// Format for 2 decimal places
	dataFile << num << endl;		// Write the number

	dataFile << setprecision(1);	// Format for 1 decimal place
	dataFile << num << endl;		// Write the number

	cout << "Done.\n";
	dataFile.close();				// Close the file
	return 0;
}

// This program writes three rows of numbers to a file.
int writeThreeRows()
{
	const int ROWS = 3;		// Rows to write
	const int COLS = 3;		// Columns to write
	int nums[ROWS][COLS] = { 2897, 5, 837,
		                     34, 7, 1623,
							 390, 3456, 12 };
	fstream outFile("../Files/table.txt", ios::out);

	// Write the three rows of numbers with each
	// number in a field of 8 character spaces.
	for (int row = 0; row < ROWS; row++)
	{
		for (int col = 0; col < COLS; col++)
		{
			outFile << setw(8) << nums[row][col];
		}
		outFile << endl;
	}
	outFile.close();
	cout << "Done.\n";
	return 0;
}