// To print the message HAPPY BIRTHDAY 10 times;

int counter = 0;

do

{

     System.out.println( "HAPPY BIRTHDAY! ");

     counter++;

}

while (counter <10); 
// To add a total, count, and average grades:

double total = 0;

// be sure to initialize variables to zero to avoid
int counter = 0;

// allowing the computer to use it's "garbage".

double average = 0;

int grade;

// Why is this variable not set equal to zero? It is filled by user.
do

{

grade=Console.readInt("Enter the grade scored.\n Enter -999 to quit. ");

     if (grade != -999)                // separating sections of the program

     {                                            // by inserting an empty line helps organize

             total += grade;           // your thinking and allows for easy reading.

             counter++;

      }
}

while (grade != -999);
average = total / counter;
System.out.println("The average of your " + counter + " grades is "+ average +".");