/*	
A file named infile.txt contains a certain number (but not more than 128) 
of integers (see an example of such a file below). 
Write a complete C++ program to read in all of these integers and 
write them out neatly in reverse order to a file named outfile.txt.

The input and output files must be opened in the main function. Your
program must have the following 3 functions 
(not counting the main function):

1. a function to read in the integers from the file infile.txt,
2. a second function to reverse the order of the integers,
3. and a third function to write the result to the file outfile.txt 
   in the form illustrated by the following example.

For example, if the input file contains:

200 3   -8923
28  45
  11   -34

then after the program has been run, the output file should contain:

  0    -34
  1     11
  2     45
  3     28
  4  -8923
  5      3
  6    200

*/

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <iomanip>
using namespace std;

const int MAXSIZE(128);

void readArray(ifstream& ins, int array[], int& size);
void reverseArray(const int array[], int yarra[], int size);
void writeArray(ofstream& outs, const int yarra[], int size);

int main ( )
{
	int array[MAXSIZE], yarra[MAXSIZE], size(0);

	ifstream ins;
	ofstream outs;
	ins.open("infile.txt");
	if (ins.fail())
	{
		cout << "Failure in opening file infile.txt.\n";
		exit(1);
	}
	
	outs.open("outfile.txt");
	if (outs.fail())
	{
		cout << "Failure in opening file outfile.txt.\n";
		ins.close();
		exit(1);
	}
	readArray(ins, array, size);
	reverseArray(array, yarra, size);
	writeArray(outs, yarra, size);

	ins.close();
	outs.close();

	return 0;
}

void readArray(ifstream& ins, int array[], int& size)
{
	while(ins >> array[size])
		size++;
}

void reverseArray(const int array[], int yarra[], int size)
{
	for (int n = 0; n < size; n++)
	{
		yarra[n] = array[size-n-1];
	}
}

void writeArray(ofstream& outs, const int yarra[], int size)
{
	for (int n = 0; n < size; n++)
	{
		outs << setw(3) << n << setw(7) << yarra[n] << endl;
	}
}