slip.14

1.
import java.util.Scanner;

class ZeroException extends Exception {
 public ZeroException(String message) {
 super(message);
 }
}
public class PrimeCheck {
 
 public static boolean isPrime(int n) {
 if (n <= 1) return false;
 for (int i = 2; i <= Math.sqrt(n); i++) {
if (n % i == 0) return false;
 }
 return true;
 }
 public static void main(String[] args) {
 Scanner sc = new Scanner(System.in);
 System.out.print("Enter a number: ");
 int num = sc.nextInt();
 try {
 if (num == 0) {
 throw new ZeroException("Number is 0");
 }
 if (isPrime(num)) {
 System.out.println(num + " is a prime number.");
 } else {
 System.out.println(num + " is not a prime number.");
 }
 } catch (ZeroException e) {
 System.out.println("Exception: " + e.getMessage());
 } finally {
 sc.close();
 }
 }
}

2.
Step 1: Package SY
File: SY/SYMarks.java
package SY;
public class SYMarks {
 public double computerTotal;
 public double mathsTotal;
 public double electronicsTotal;
 public SYMarks(double computerTotal, double mathsTotal, double
electronicsTotal) {
 this.computerTotal = computerTotal;
 this.mathsTotal = mathsTotal;
 this.electronicsTotal = electronicsTotal;
 }
}
Step 2: Package TY
File: TY/TYMarks.java
package TY;
public class TYMarks {
 public double theory;
 public double practicals;
 public TYMarks(double theory, double practicals) {
 this.theory = theory;
 this.practicals = practicals;
 }
}

Step 3: Student Class
File: Student.java
import SY.SYMarks;
import TY.TYMarks;
public class Student {
 private int rollNumber;
 private String name;
 private SYMarks syMarks;
 private TYMarks tyMarks;
 public Student(int rollNumber, String name, SYMarks syMarks, TYMarks
tyMarks) {
 this.rollNumber = rollNumber;
 this.name = name;
 this.syMarks = syMarks;
 this.tyMarks = tyMarks;
 }
 
 public double getComputerTotal() {
 return syMarks.computerTotal + tyMarks.theory + tyMarks.practicals;
 }
 
 public String getGrade() {
 double total = getComputerTotal();
 if (total >= 70) return "A";
 else if (total >= 60) return "B";
 else if (total >= 50) return "C";
 else if (total >= 40) return "Pass Class";
 else return "FAIL";
 }
 
 public void display() {
 System.out.println("\n--- Student Result ---");
 System.out.println("Roll Number : " + rollNumber);
 System.out.println("Name : " + name);
 System.out.println("SY Computer : " + syMarks.computerTotal);
System.out.println("TY Theory : " + tyMarks.theory);
 System.out.println("TY Practical: " + tyMarks.practicals);
 System.out.println("Total Marks : " + getComputerTotal());
 System.out.println("Grade : " + getGrade());
 }
}
Step 4: Driver Class
File: StudentDriver.java
import java.util.Scanner;
import SY.SYMarks;
import TY.TYMarks;
public class StudentDriver {
 public static void main(String[] args) {
 Scanner sc = new Scanner(System.in);
 System.out.print("Enter number of students: ");
 int n = sc.nextInt();
 sc.nextLine(); // consume newline
 Student[] students = new Student[n];
 for (int i = 0; i < n; i++) {
 System.out.println("\nEnter details for student " + (i + 1) + ":");
 System.out.print("Roll Number: ");
 int roll = sc.nextInt();
 sc.nextLine();
 System.out.print("Name : ");
 String name = sc.nextLine();
 System.out.print("SY Computer Marks : ");
 double syComputer = sc.nextDouble();
 System.out.print("SY Maths Marks : ");
 double syMaths = sc.nextDouble();
 System.out.print("SY Electronics Marks: ");
 double syElectronics = sc.nextDouble();
 System.out.print("TY Theory Marks : ");
 double tyTheory = sc.nextDouble();
 System.out.print("TY Practical Marks : ");

double tyPractical = sc.nextDouble();
 sc.nextLine();
 SYMarks syMarks = new SYMarks(syComputer, syMaths,
syElectronics);
 TYMarks tyMarks = new TYMarks(tyTheory, tyPractical);
 students[i] = new Student(roll, name, syMarks, tyMarks);
 }
 
 for (Student s : students) {
 s.display();
 }
 sc.close();
 }
}


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