Student class and two merged feature: calculator, grade

src/main/.gitignore

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+ignore.txt

src/main/Calculator.java

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+public class Calculator {
+
+    // Method to add two numbers
+    public int add(int a, int b) {
+        return a + b + 42; // Adding 42 to the sum
+    }
+
+    // Method to subtract two numbers
+    public int subtract(int a, int b) {
+        return a - b;
+    }
+
+    // Method to multiply two numbers
+    public int multiply(int a, int b) {
+        return a * b;
+    }
+
+    // Method to divide two numbers
+    public double divide(int a, int b) {
+        if (b != 0) {
+            return (double) a / b;
+        } else {
+            throw new ArithmeticException("Division by zero is not allowed.");
+        }
+    }
+}
+

src/main/Grade.java

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+public class Grade {
+    private String courseName;
+    private int marks;
+    private String grade;
+    private double gradePoint;
+
+    // Constructor
+    public Grade(String courseName, int marks) {
+        this.courseName = courseName;
+        this.marks = marks;
+        setGradeAndPoint(marks); // auto-assign grade and GPA
+    }
+
+    // Getters
+    public String getCourseName() {
+        return courseName;
+    }
+
+    public int getMarks() {
+        return marks;
+    }
+
+    public String getGrade() {
+        return grade;
+    }
+
+    public double getGradePoint() {
+        return gradePoint;
+    }
+
+    // Setters
+    public void setCourseName(String courseName) {
+        this.courseName = courseName;
+    }
+
+    public void setMarks(int marks) {
+        this.marks = marks;
+        setGradeAndPoint(marks); // update grade & GPA when marks change
+    }
+
+    // Private helper to assign grade & GPA based on KUET rules
+    private void setGradeAndPoint(int marks) {
+        if (marks >= 80) { grade = "A+"; gradePoint = 4.00; }
+        else if (marks >= 75) { grade = "A"; gradePoint = 3.75; }
+        else if (marks >= 70) { grade = "A-"; gradePoint = 3.50; }
+        else if (marks >= 65) { grade = "B+"; gradePoint = 3.25; }
+        else if (marks >= 60) { grade = "B"; gradePoint = 3.00; }
+        else if (marks >= 55) { grade = "B-"; gradePoint = 2.75; }
+        else if (marks >= 50) { grade = "C+"; gradePoint = 2.50; }
+        else if (marks >= 45) { grade = "C"; gradePoint = 2.25; }
+        else if (marks >= 40) { grade = "D"; gradePoint = 2.00; }
+        else { grade = "F"; gradePoint = 0.00; }
+    }
+
+    // Print method
+    public void printInfo() {
+        System.out.println("Course: " + courseName +
+                           " | Marks: " + marks +
+                           " | Grade: " + grade +
+                           " | GPA: " + gradePoint);
+    }
+}
+// End of Grade class

src/main/Student.java

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+public class Student {
+    private String name;
+    private int roll;
+    private String department;
+    private int batch;
+    private double cgpa;
+
+    // Default constructor
+    public Student() {
+    }
+
+    // Parameterized constructor
+    public Student(String name, int roll, String department, int batch, double cgpa) {
+        this.name = name;
+        this.roll = roll;
+        this.department = department;
+        this.batch = batch;
+        this.cgpa = cgpa;
+    }
+
+    // Getters
+    public String getName() { return name; }
+    public int getRoll() { return roll; }
+    public String getDepartment() { return department; }
+    public int getBatch() { return batch; }
+    public double getCgpa() { return cgpa; }
+
+    // Setters
+    public void setName(String name) { this.name = name; }
+    public void setRoll(int roll) { this.roll = roll; }
+    public void setDepartment(String department) { this.department = department; }
+    public void setBatch(int batch) { this.batch = batch; }
+    public void setCgpa(double cgpa) { this.cgpa = cgpa; }
+
+    // Print method
+    public void print() {
+        System.out.println("Student Details:");
+        System.out.println("Name: " + name);
+        System.out.println("Roll: " + roll);
+        System.out.println("Department: " + department);
+        System.out.println("Batch: " + batch);
+        System.out.println("CGPA: " + cgpa);
+    }
+}
+// End of Student class