// This version uses a do-while loop.

public class SpaceInvadersDoWhile
{
  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)");
			
     do 
     {									
	score = SavitchIn.readLineInt();

	// Update min and max scores
	// We need to check if score is -1 because we don't
	// want it to count as a "min" score
	// Note: you don't have to do this in the while loop version!
	// (Why?)
	if ((score != -1) &&
	    (score < minScore || minScore == -1)) 
	{
	    minScore = score;
	}
	if (score > maxScore || maxScore == -1) 
	{
	    maxScore = score;
	}

	// Update variables so we can calculate average later.
	// Again, we need to check if score is -1, because
	// we don't want to count that one.
	if (score != -1)
	{
	    numScores++;
	    sumScores += score;
	}

     } while (score != -1); // terminate when sentinel value is given

     // 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);
	
  }
	
}