/* This program shows you how to use dynamic arrays in C++ */

#include <iostream>           // for cout, cin, etc
#include <cstdlib>           
using namespace std;

int main()
{

  cout << "Give matrix dimensions (rows, columns): ";
  size_t m, n;
  cin >> m >> n;
  cout << "m=" << m << "  n=" << n << endl;

  int *a = new int [n*m];     // allocate matrix on the heap

  // perform calculations
  for (size_t i=0; i<m; ++i)
    for (size_t j=0; j<n; ++j)
      a[(i*n)+j] = (i*n)+j+1;

  //  Do i=1,m; Print *, a(i,:); End Do
  for (size_t i=0; i<m; ++i) {
    for (size_t j=0; j<n; j++)
      cout << " " << a[(i*n)+j];
    cout << endl;
  }

  // Deallocate ( a )
  delete [] a;                 // use [] or result undefined!
}

  // Program outputs:
  // Give matrix dimensions ( rows, columns): 2 3
  // m=2  n=3
  // 1 2 3
  // 4 5 6