Java How To Program, Late Objects, 11th Edition

... // use number with decimal point to calculate average of grades
33            double average = (double) total / gradeCounter;                
34
35            // display total and average (with two digits of precision)
36            System.out.printf("%nTotal of the %d grades entered is %d%n",
37               gradeCounter, total);
38            System.out.printf("Class average is %.2f%n", average);
39         }
40         else { // no grades were entered, so output appropriate message
41            System.out.println("No grades were entered");
42         }
43      }
44   }

Enter grade or -1 to quit: 97
Enter grade or -1 to quit: 88
Enter grade or -1 to quit: 72
Enter grade or -1 to quit: -1

Total of the 3 grades entered is 257
Class average is 85.67

Program Logic for Sentinel-Controlled Iteration vs. Counter-Controlled Iteration

Line 12 initializes gradeCounter ...