switch (grade)
{
   case 'A' :
      cout << "Passing" << endl;
      break;

   case 'B' :
      cout << "Passing" << endl;
      break;

   case 'C' :
      cout << "Passing" << endl;
      break;

   case 'D' :
      cout << "Not Passing" << endl;
      break;

   case 'F' :
      cout << "Not Passing" << endl;
      break;

   default        :
      cout << "Invalid grade" << endl;
      break;
}