public class ExamAverager
1:
2: import java.util.*;
3:
4: /**
5: Determines the average of a list of (nonnegative) exam scores.
6: Repeats for more exams until the user says she/he is finished.
7: */
8: public class ExamAverager
9: {
10: public static void main(String[] args)
11: {
12: System.out.println("This program computes the average of");
13: System.out.println("a list of (nonnegative) exam scores.");
14: double sum;
15: int numberOfStudents;
16: double next;
17: String answer;
18: Scanner keyboard = new Scanner(System.in);
19: do
20: {
21: System.out.println( );
22: System.out.println("Enter all the scores to be averaged.");
23: System.out.println("Enter a negative number after");
24: System.out.println("you have entered all the scores.");
25: sum = 0;
26: numberOfStudents = 0;
27: next = keyboard.nextDouble( );
28: while (next >= 0)
29: {
30: sum = sum + next;
31: numberOfStudents++;
32: next = keyboard.nextDouble( );
33: }
34: if (numberOfStudents > 0)
35: System.out.println("The average is "
36: + (sum/numberOfStudents));
37: else
38: System.out.println("No scores to average.");
39: System.out.println("Want to average another exam?");
40: System.out.println("Enter yes or no.");
41: answer = keyboard.next( );
42: }while (answer.equalsIgnoreCase("yes"));
43:
44: }
45: }