Conditional Execution - Building Java Programs: A Back to Basics Approach - page 249

This goal is easy to accomplish with an if statement and an integer variable called a
counter. You start by initializing the counter to 0 :
int negatives = 0;
You can use any name you want for the variable. Here we used negatives
because that is what you're counting. The other essential step is to increment the
counter inside the loop if it passes the test of interest:
if (next < 0) {
negatives++;
}
When you put this all together and modify the comments and introduction, you
end up with the following variation of the cumulative sum program:
1 // Finds the average of a sequence of numbers as well as
2 // reporting how many of the user-specified numbers were negative.
3
4 import java.util.*;
5
6 public class ExamineNumbers2 {
7 public static void main(String[] args) {
8 System.out.println("This program examines a sequence");
9 System.out.println("of numbers to find the average");
10 System.out.println("and count how many are negative.");
11 System.out.println();
12
13 Scanner console = new Scanner(System.in);
14
15 System.out.print("How many numbers do you have? ");
16 int totalNumber = console.nextInt();
17
18 int negatives = 0;
19 double sum = 0.0;
20 for ( int i = 1; i <= totalNumber; i++) {
21 System.out.print(" #" + i + "? ");
22 double next = console.nextDouble();
23 sum += next;
24 if (next < 0) {
25 negatives++;
26 }
27 }
28 System.out.println();
29
30 if (totalNumber <= 0) {