// This version uses a while loop.

public class SpaceInvadersWhile
{
  public static void main(String args[])
  {
     // Use invalid values for min and max so
     // we know they need to be updated with the first number
     int minScore = -1;
     int maxScore = -1;

     // To calculate average, we need the sum of scores and
     // how many were entered.
     double avgScore = 0;
     int sumScores = 0;
     int numScores = 0;
     
     int score;

     System.out.println("Please enter your Space Invaders scores " +
			"(-1 to terminate)");
     score = SavitchIn.readLineInt();

     // Other choices possible for the loop condition.
     // This one makes it clear what the sentinel value is (-1).
     while (score != -1)
     {									
	// Update min and max scores
	if (score < minScore || minScore == -1) 
	{
	    minScore = score;
	}
	if (score > maxScore || maxScore == -1) 
	{
	    maxScore = score;
	}

	// Update variables so we can calculate average later.
	numScores++;
	sumScores += score;

	// Read in a new score
	score = SavitchIn.readLineInt();
     } 

     // Calculate the average.
     // Let's cast to a double so that the result is a double
     // (floating point division)
     avgScore = sumScores / (double)numScores;
     
     // Output stats
     System.out.println("Your highest score was " + maxScore);
     System.out.println("Your lowest score was " + minScore);
     System.out.println("Your average score was " + avgScore);
	
  }
	
}