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  1. import java.util.Scanner;
  2.  
  3. // Base class
  4. class Person {
  5.     String name;
  6.     int age;
  7.  
  8.     Person(String name, int age) {
  9.         this.name = name;
  10.         this.age = age;
  11.     }
  12.  
  13.     void displayInfo() {
  14.         System.out.println("Name: " + name + ", Age: " + age);
  15.     }
  16. }
  17.  
  18. // Derived class
  19. class Student extends Person {
  20.     int numSubjects;
  21.     double[] grades;
  22.  
  23.     Student(String name, int age, int numSubjects) {
  24.         super(name, age);
  25.         this.numSubjects = numSubjects;
  26.         this.grades = new double[numSubjects];
  27.     }
  28.  
  29.     void inputGrades(Scanner sc) {
  30.         for (int i = 0; i < numSubjects; i++) {
  31.             double grade;
  32.             do {
  33.                 System.out.print("Enter grade for subject " + (i + 1) + ": ");
  34.                 grade = sc.nextDouble();
  35.                 if (grade < 0 || grade > 100) {
  36.                     System.out.println("Invalid grade. Please enter between 0 and 100.");
  37.                 }
  38.             } while (grade < 0 || grade > 100);
  39.             grades[i] = grade;
  40.         }
  41.     }
  42.  
  43.     double calculateGPA() {
  44.         double total = 0;
  45.         for (int i = 0; i < numSubjects; i++) {
  46.             total += grades[i];
  47.         }
  48.         return total / numSubjects;
  49.     }
  50.  
  51.     String getLetterGrade(double gpa) {
  52.         if (gpa >= 90) return "A";
  53.         else if (gpa >= 80) return "B";
  54.         else if (gpa >= 70) return "C";
  55.         else if (gpa >= 60) return "D";
  56.         else return "F";
  57.     }
  58.  
  59.     void displayGrades() {
  60.         for (int i = 0; i < numSubjects; i++) {
  61.             System.out.println("Subject " + (i + 1) + ": " + grades[i]);
  62.         }
  63.     }
  64. }
  65.  
  66. public class Main {
  67.     public static void main(String[] args) {
  68.         Scanner sc = new Scanner(System.in);
  69.         System.out.print("Enter number of students: ");
  70.         int numStudents = sc.nextInt();
  71.  
  72.         Student[] students = new Student[numStudents];
  73.  
  74.         for (int i = 0; i < numStudents; i++) {
  75.             System.out.println("\nEnter details for Student " + (i + 1));
  76.             sc.nextLine(); // Clear buffer
  77.             System.out.print("Name: ");
  78.             String name = sc.nextLine();
  79.             System.out.print("Age: ");
  80.             int age = sc.nextInt();
  81.             System.out.print("Number of subjects: ");
  82.             int numSubjects = sc.nextInt();
  83.  
  84.             students[i] = new Student(name, age, numSubjects);
  85.             students[i].inputGrades(sc);
  86.         }
  87.  
  88.         System.out.println("\n--- GPA Report ---");
  89.         for (int i = 0; i < numStudents; i++) {
  90.             students[i].displayInfo();
  91.             students[i].displayGrades();
  92.             double gpa = students[i].calculateGPA();
  93.             System.out.printf("GPA: %.2f\n", gpa);
  94.             System.out.println("Letter Grade: " + students[i].getLetterGrade(gpa));
  95.             System.out.println("----------------------");
  96.         }
  97.  
  98.         sc.close();
  99.     }
  100. }
  101.  
Success #stdin #stdout 0.25s 59340KB
comments (?)
stdin
copy 
2
Ali
18
3
90
85
80
Sara
19
2
78
88
stdout
copy 
Enter number of students: 
Enter details for Student 1
Name: Age: Number of subjects: Enter grade for subject 1: Enter grade for subject 2: Enter grade for subject 3: 
Enter details for Student 2
Name: Age: Number of subjects: Enter grade for subject 1: Enter grade for subject 2: 
--- GPA Report ---
Name: Ali, Age: 18
Subject 1: 90.0
Subject 2: 85.0
Subject 3: 80.0
GPA: 85.00
Letter Grade: B
----------------------
Name: Sara, Age: 19
Subject 1: 78.0
Subject 2: 88.0
GPA: 83.00
Letter Grade: B
----------------------
https://ideone.com/cRTUNW
language:
Java (HotSpot 12)
created:
19 hours ago
visibility:
public

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