Переделать программу под классы

#include <conio.h>
#include <iostream>
#include <fstream>
using namespace std;

int *funk(int *a, int n)
{ 
    int i, j, *b, min, max;
   	int sum = 0;
   	int m = n+1;
   	b = new int [ m * m ];
	for ( i = 0; i < n; i++ )
	{
		min = *(a+i*n+0);
		for ( j = 0; j < n; j++ )
		{
			*(b+i*m+j) = *(a+i*n+j);
			if ( *(a+i*n+j) < min )
				min = *(a+i*n+j);
		}
		*(b+i*m+j) = min;
		sum += min;
	}
	
	for ( j = 0; j < n; j++ )
	{
		max = *(a+0*n+j);
		for ( i = 0; i < n; i++ )
		{
			if ( *(a+i*n+j) > max )
				max = *(a+i*n+j);
		}
		*(b+i*m+j) = max;
		sum += max;
	}
	
	*(b+(m-1)*m+(m-1)) = sum;
	return b;
}

main()
{
	int i, j, n, *a, *b, *matr;
	ifstream fin;
	ofstream fout;
	fin.open("vvod.txt");
	cout << "Vvedite n\n";
	fin >> n;
	a = new int [n * n];
	int m = n + 1;
	cout << "Vvedite matricy\n";
	for ( i = 0; i < n; i++ )
	for ( j = 0; j < n; j++ )
	fin >> *(a+i*n+j);	
	
	cout<< "Vasha matrica\n";
	for  ( i = 0; i < n; i++)
	{
		for  ( j = 0; j < n; j++)
		cout << *(a+i*n+j) << ' ';
		cout<< "\n";
	}
	matr = new int [n+1, n+1];
	matr = funk(a, n);
	
	fin.close();
	fout.open("vivod.txt", ios::app);
	
	fout << "\nRezultat:\n";
	for ( i = 0; i < m; i++ )
	{
		for ( j = 0; j < m; j++ )
		fout << *(matr+i*m+j) << ' ';
		fout << "\n";
	}
	fout.close();
	
	//getch();
}