#include <iostream>
using std::cout; using std::endl;

int main()
{
 int arr[3][4] = 
 { 
 { 0, 1, 2, 3 },
 { 4, 5, 6, 7 },
 { 8, 9, 10, 11 }
 };

 // range for
 for (const int(&row)[4] : arr)
 for (int col : row) cout << col << " ";
 cout << endl;

 // for loop
 for (size_t i = 0; i != 3; ++i)
 for (size_t j = 0; j != 4; ++j) cout << arr[i][j] << " ";
 cout << endl;

 // using pointers.
 for (int(*row)[4] = arr; row != arr + 3; ++row)
 for (int *col = *row; col != *row + 4; ++col) cout << *col << " ";
 cout << endl;

 return 0;
}