popcorn hac 1
// work by adi katre
public class Dog {
private String name;
public Dog(String name) {
this.name = name;
}
private String breed;
public void Bred(String breed) {
System.out.println("My dog " + name + " is a " + breed);
}
}
// Create an instance of Dog and call the Bred method
Dog myDog = new Dog("Bud");
myDog.Bred("mut");
popon hack 2
public class Counter {
private int count;
public void add(int x) {
count += x;
}
public int getCount() {
return count;
}
public void subtract(int x) {
count += x;
}
public void divide(int x) {
count = count / x;
}
public void multiply(int x) {
count = count * x;
}
}
// Use it:
Counter c = new Counter();
c.add(5);
c.add(1);
c.subtract(-1);
c.divide(2);
c.multiply(3);
int val = c.getCount();
System.out.println(val);
heoework hack
/**
* Student Grade Tracker System
*
* This program demonstrates the use of instance methods, constructors,
* and object-oriented design by managing students' grades and generating
* detailed reports. It also includes bonus features such as highest/lowest
* grade tracking and grade comparison.
*/
import java.util.ArrayList;
public class StudentGradeTracker {
public static void main(String[] args) {
System.out.println("=== Student Grade Tracker System ===\n");
// ----- Create Student 1 -----
System.out.println("Creating student: Emma Rodriguez");
Student emma = new Student("Emma Rodriguez");
System.out.println("Student created successfully!\n");
System.out.println("--- Adding Grades for Emma ---");
emma.addGrade(95);
emma.addGrade(88);
emma.addGrade(92);
emma.addGrade(85);
System.out.println("\n--- Emma's Grade Report ---");
emma.printReport();
System.out.println("========================================\n");
// ----- Create Student 2 -----
System.out.println("Creating student: James Wilson");
Student james = new Student("James Wilson");
System.out.println("Student created successfully!\n");
System.out.println("--- Adding Grades for James ---");
james.addGrade(78);
james.addGrade(82);
james.addGrade(75);
System.out.println("\n--- James's Grade Report ---");
james.printReport();
System.out.println("========================================\n");
// Final summary
System.out.println("Final Summary:");
System.out.printf("%s - Average: %.2f (%s)%n", emma.getName(), emma.getAverage(), emma.getLetterGrade());
System.out.printf("%s - Average: %.2f (%s)%n", james.getName(), james.getAverage(), james.getLetterGrade());
System.out.println("\n=== BONUS CHALLENGES DEMONSTRATION ===");
System.out.println(emma.getName() + "'s Highest Grade: " + emma.getHighestGrade());
System.out.println(emma.getName() + "'s Lowest Grade: " + emma.getLowestGrade());
// Compare averages
int comparison = emma.compareTo(james);
if (comparison > 0)
System.out.println(emma.getName() + " has a higher average than " + james.getName());
else if (comparison < 0)
System.out.println(james.getName() + " has a higher average than " + emma.getName());
else
System.out.println("Both students have the same average!");
// Demonstrate dropping the lowest grade
System.out.println("\nDropping " + emma.getName() + "'s lowest grade...");
emma.dropLowestGrade();
emma.printReport();
// Reset James' grades
System.out.println("\nResetting " + james.getName() + "'s record...");
james.reset();
james.printReport();
}
}
/**
* The Student class represents a student with a name, total points, and
* number of assignments. It tracks grades, calculates averages, assigns
* letter grades, and can produce a formatted report.
*/
class Student {
// Instance variables
private String name;
private int totalPoints;
private int numAssignments;
private ArrayList<Integer> grades; // for bonus methods
// Constructor
public Student(String name) {
this.name = name;
this.totalPoints = 0;
this.numAssignments = 0;
this.grades = new ArrayList<>();
}
// ---- Required Void Method ----
public void addGrade(int points) {
if (points < 0 || points > 100) {
System.out.println("Invalid grade: " + points + ". Skipped.");
return;
}
grades.add(points);
totalPoints += points;
numAssignments++;
System.out.println("Adding grade: " + points + " points");
}
// ---- Required Non-Void Method ----
public double getAverage() {
if (numAssignments == 0) return 0.0;
return (double) totalPoints / numAssignments;
}
// ---- Required Non-Void Method ----
public String getLetterGrade() {
double avg = getAverage();
if (avg >= 90) return "A";
else if (avg >= 80) return "B";
else if (avg >= 70) return "C";
else if (avg >= 60) return "D";
else return "F";
}
// ---- Required Void Method ----
public void printReport() {
System.out.println("Student Name: " + name);
System.out.println("Total Points: " + totalPoints);
System.out.println("Assignments Completed: " + numAssignments);
System.out.printf("Current Average: %.2f%n", getAverage());
System.out.println("Letter Grade: " + getLetterGrade());
// Status message based on grade
switch (getLetterGrade()) {
case "A":
System.out.println("Status: Excellent work!");
break;
case "B":
System.out.println("Status: Great job!");
break;
case "C":
System.out.println("Status: Keep working hard!");
break;
case "D":
System.out.println("Status: Needs improvement.");
break;
default:
System.out.println("Status: At risk — please seek help.");
}
}
// ---- BONUS METHODS ----
public int getHighestGrade() {
if (grades.isEmpty()) return 0;
int max = grades.get(0);
for (int g : grades)
if (g > max) max = g;
return max;
}
public int getLowestGrade() {
if (grades.isEmpty()) return 0;
int min = grades.get(0);
for (int g : grades)
if (g < min) min = g;
return min;
}
public void dropLowestGrade() {
if (grades.isEmpty()) {
System.out.println("No grades to drop!");
return;
}
int lowest = getLowestGrade();
grades.remove(Integer.valueOf(lowest));
totalPoints -= lowest;
numAssignments--;
System.out.println("Dropped lowest grade: " + lowest);
}
public int compareTo(Student other) {
return Double.compare(this.getAverage(), other.getAverage());
}
public void reset() {
grades.clear();
totalPoints = 0;
numAssignments = 0;
System.out.println("All grades cleared for " + name);
}
// Getter for name (for reporting)
public String getName() {
return name;
}
}
StudentGradeTracker.main(null);
=== Student Grade Tracker System ===
Creating student: Emma Rodriguez
Student created successfully!
--- Adding Grades for Emma ---
Adding grade: 95 points
Adding grade: 88 points
Adding grade: 92 points
Adding grade: 85 points
--- Emma's Grade Report ---
Student Name: Emma Rodriguez
Total Points: 360
Assignments Completed: 4
Current Average: 90.00
Letter Grade: A
Status: Excellent work!
========================================
Creating student: James Wilson
Student created successfully!
--- Adding Grades for James ---
Adding grade: 78 points
Adding grade: 82 points
Adding grade: 75 points
--- James's Grade Report ---
Student Name: James Wilson
Total Points: 235
Assignments Completed: 3
Current Average: 78.33
Letter Grade: C
Status: Keep working hard!
========================================
Final Summary:
Emma Rodriguez - Average: 90.00 (A)
James Wilson - Average: 78.33 (C)
=== BONUS CHALLENGES DEMONSTRATION ===
Emma Rodriguez's Highest Grade: 95
Emma Rodriguez's Lowest Grade: 85
Emma Rodriguez has a higher average than James Wilson
Dropping Emma Rodriguez's lowest grade...
Dropped lowest grade: 85
Student Name: Emma Rodriguez
Total Points: 275
Assignments Completed: 3
Current Average: 91.67
Letter Grade: A
Status: Excellent work!
Resetting James Wilson's record...
All grades cleared for James Wilson
Student Name: James Wilson
Total Points: 0
Assignments Completed: 0
Current Average: 0.00
Letter Grade: F
Status: At risk — please seek help.
