Getting Possible Values (Sudoku Game)

[brycematheson]

I'm a little confused. As you can tell, I'm a beginner at C++. From the above statement, this is about what I got:

      for (int i = 0; i < 9; i++)
      {
         for (int j = 0; j < 9; j++)
         {

         }

      }

Haha. Could you maybe explain it a little bit more? Thank you!