// Counter
// Demonstrates for loops

#include <iostream>

using namespace std;

int main()
{
   cout << "Counting forward:\n";
   for (int i = 0; i < 10; ++i)
   {
      cout << i << " ";
   }
   
   cout << "\n\nCounting backward:\n";
   for (int i = 9; i >= 0; --i)
   {
      cout << i << " ";
   }
   
   cout << "\n\nCounting by fives:\n";
   for (int i = 0; i <= 50; i += 5)
   {
      cout << i << " ";
   }
   
   cout << "\n\nCounting with null statements:\n";
   int count = 0;
   for ( ; count < 10; )
   {
      cout << count << " ";
      ++count;
   }
   
   cout << "\n\nCounting with nested for loops:\n";
   const int ROWS = 5;
   const int COLUMNS = 3;
   for (int i = 0; i < ROWS; ++i)
   {
      for (int j = 0; j < COLUMNS; ++j)
      {
         cout << i << "," << j << " ";
      }
      cout << endl;
   }
   return 0;
}