#include <iostream>
using namespace std;

int main (int argc, char** argv)
{
 double **arr;
 int rowSize;
 int colSize;
 int i, j;

 rowSize = 5;
 colSize = 7;

 arr = new double*[colSize];

 for (i = 0 ; i < colSize; ++i)
    arr[i] = new double[rowSize];

 for (i = 0; i < colSize; ++i)
   for (j = 0; j < rowSize; ++j)
     arr[i][j] = i * 10.0 + j;

 cout << "Dynamic 2D array as an array of arrays" << endl;
 for (i = 0; i < colSize; ++i)
  {
   for (j = 0; j < rowSize; ++j)
     cout << arr[i][j] << "  ";
   cout << endl;
  }
 cout << endl;

 double *arr2;
 rowSize = 6;
 colSize = 4;
 
 arr2 = new double [ colSize * rowSize ];

 for (i = 0; i < colSize; ++i)
   for (j = 0; j < rowSize; ++j)
    {
     // cout << i << " " << j << " " << i * rowSize + j << " " << i * 10.0 + j << endl;
     arr2[i * rowSize + j] = i * 10.0 + j;
    }

 cout << "Dynamic 2D array as a Dynamic 1D array in Column Major form" << endl;
 for (i = 0; i < colSize; ++i)
  {
   for (j = 0; j < rowSize; ++j)
     cout << arr2[i * rowSize + j] << "  ";
   cout << endl;
  }
 cout << endl;

 // deallocation code to prevend memory leaks. 
 delete[] arr2;

 for (i = 0 ; i < colSize; ++i)
    delete[] arr[i];
 delete [] arr;

 return 0;
}