Computer Science 210
Data Structures
Fall 2019, Siena College
GradeRangeCounter BlueJ Project
Click here to download a BlueJ project for GradeRangeCounter.
GradeRangeCounter Source Code
The Java source code for GradeRangeCounter is below. Click on a file name to download it.
/**
* Example GradeRangeCounter: input a set of scores, track the number of
* scores which fall into each of several grade ranges as defined by some
* initialized arrays.
*
* Note: This is a Java application. In BlueJ, run by choosing "main"
* when you right-click on the class icon in the main window.
*
* @author Jim Teresco, The College of Saint Rose, CSC 252, Fall 2013
* @version Updated for Fall 2016, CSIS 210, Siena College
*
*/
import java.util.Scanner;
public class GradeRangeCounter {
/**
Count grades that fall into letter grade ranges.
@param args not used
*/
public static void main(String[] args) {
// define our grades and thresholds
final String [] LETTER_GRADES = { "A", "A-", "B+", "B", "B-", "C+", "C", "C-", "D+", "D", "F" };
final double [] THRESHOLDS = { 93.0, 90.0, 87.0, 83.0, 80.0, 77.0, 73.0, 70.0, 67.0, 63.0, 0.0 };
// the array where we'll track the number of grades at each level
// in Java, these are automatically initialized to 0's
int [] grades = new int[LETTER_GRADES.length];
// a Scanner to read in our grades from the keyboard
Scanner keyboard = new Scanner(System.in);
double grade;
// read grades
do {
System.out.print("Next grade? (Enter value outside 0-100 to quit) ");
grade = keyboard.nextDouble();
// make sure we're in the legal range
if (grade >= 0 && grade <= 100) {
for (int i = 0; i < THRESHOLDS.length; i++) {
if (grade >= THRESHOLDS[i]) {
grades[i]++;
break; // once we've matched, stop the loop
}
}
}
} while (grade >= 0 && grade <= 100);
// print the resulting table
System.out.println("Grade breakdown:");
for (int i = 0; i < THRESHOLDS.length; i++) {
System.out.println(LETTER_GRADES[i] + ": " + grades[i]);
}
}
}