// Zeinalipour-Yazti Demetrios
// csyiazti
// cs10xx -
// Lab Sec#24,29,30
// lab7

#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
#include <cmath>
using namespace std;

/* This program reads in integers from a file chosen by the user at runtime.
 * It then prints out the number and each individual digit of that number.
 * We assume that all the numbers in the file are positive values less than
 * 10,000.  The digits line up nicely.
 */

// the length of the largest number (e.g 1020 => 4)
const int MAX_NUMBER = 4;

/* this function takes by reference an ifstream. It basically
 * makes sure that the user enters the appropriate output
 * file, gets a pointer to it and quits.
 */
void getFileStream(ifstream& infilestream)
{
        string filename;

        // repeat the loop until the user enters the correct filename
        while (true)
        {
          /* get the filename */
          cout << "Give me the name of the file: " ;
          cin >> filename;

          cout << "\nOpening \'" << filename << "\'...";

          /* open file in read mode */
          infilestream.open(filename.c_str(), ios::in);

          // if the file was opened succesful then break this loop
          // else display error message and let him try again
          if (infilestream)
          {
			cout << "done\n";
			break;
          }
          else
          {
			cout << "failed\n";
			cerr << "File could not be opened\n" << endl;
			infilestream.close();
          }

		} // while
}


void main ()
{
	// the input filestream & the number read at each line of the file
	ifstream infilestream;
	int number;  // the number read from a line
	int power;   // variable to be used to define digit
	int digit;   // the digit of a number. Each number will have 4 digits

	cout << "Number Splitting from files by Demetris Zeinalipour - Lab 7\n\n";

	// function declarations
	void getFileStream(ifstream& infilestream);

	// this function does all the work related to opening the file and validation.
	getFileStream(infilestream);

	// left-justify any future output   (just doi it once!)
	cout << setiosflags(ios::left);

	// repeat this loop until you reach the end of that file
	while (!infilestream.eof())
	{
	    // read integer from the file
	    infilestream >> number;

		// print out this number
		cout << setw(7) << number;

		// split and print each digit of this number
		for (int i=MAX_NUMBER-1; i>=0; i--)
		{
			power = (int)pow(10,i);

			digit  = number /  power;
			number %= power;

			// print ot the
			cout << setw(7) << digit;
		}
		cout << endl;

	}

	// !always remember to close the file before quitting
	infilestream.close();
}