Java Reference
In-Depth Information
Display 3.8
Averaging a List of Scores
1
import
java.util.Scanner;
2
public class
Averager
3 {
4
public static void
main(String[] args)
5 {
6 Scanner keyboard =
new
Scanner(System.in);
7 System.out.println("Enter a list of nonnegative scores.");
8 System.out.println("Mark the end with a negative number.");
9 System.out.println("I will compute their average.");
10
double
next, sum = 0;
11
int
count = 0;
12 next = keyboard.nextDouble( );
13
while
(next >= 0)
14 {
15 sum = sum + next;
16 count++;
17 next = keyboard.nextDouble( );
18 }
19
if
(count == 0)
20 System.out.println("No scores entered.");
21
else
22 {
23
double
average = sum/count;
24 System.out.println(count + " scores read.");
25 System.out.println("The average is " + average);
26 }
27 }
28 }
Sample Dialogue
Enter a list of nonnegative scores.
Mark the end with a negative number.
I will compute their average.
87.5 0 89 99.9 -1
4 scores read.
The average is 69.1.
