// Lab #8: File It Away
// Program: READINT1.CPP

// This program reads a specific number of rows of
// integers with a specific number of values per line
// from a user-specified file.

#include <iostream.h>
#include <iomanip.h>
#include <fstream.h>

void read_numbers (ifstream &f);

void main()
{
	char filename[20];
	ifstream fin;

	// Declare and define the input file stream fin.
	cout << "Please enter a file name: ";
	cin >> filename;
	fin.open(filename);
	while (fin.fail())
	{
		cerr << "Cannot open " << filename << " for reading." << endl;
		cout << "Please re-enter the file name: ";
		cin >> filename;
		fin.open(filename);
	}

	// Display the contents of fin to the screen.
	read_numbers(fin);

	// Close the file stream
	fin.close();
}

// This function reads for a specific number of rows
// and a specific number of values per row in the
// given input file stream f.  It then writes those
// values to the screen in the presumed format.
void read_numbers (ifstream &f)
{
	int numlines, numvalues, number, i, j;

	cout << "Enter the number of lines in your file: ";
	cin >> numlines;
	cout << "Please enter the number of values per line. " << endl;
	cout << "(They must be the same for each line.): ";
	cin >> numvalues;
	cout << endl;
	cout << "The file contents: " << endl << endl;

	for (i = 1; i <= numlines; i++)
	{
		for (j = 1; j <= numvalues; j++)
		{
			f >> number;
			cout << setw(8) << number;
		}
		cout << endl;
	}
}