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Author: Mehrab Task1: import java.util.Scanner; public class Area { public static void main(String args[]){ int radius; double area; Scanner sc = new Scanner(System.in); System.out.println("Enter the radius of the circle ::"); radius = sc.nextInt(); area = (radius*radius)*Math.PI; System.out.println("Area of the circle is ::"+area); } } Task2: import java.util.Scanner; public class EvenOdd { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.print("Enter a number: "); int num = sc.nextInt(); if(num % 2 == 0) System.out.println(num + " is even"); else System.out.println(num + " is odd"); } } Task3: import java.util.Scanner; public class Factorial { public static void main(String[] args) { // TODO Auto-generated method stub int i; int fact = 1; int number; System.out.println("Enter a number: "); Scanner sc = new Scanner(System.in); number = sc.nextInt(); for(i=1; i<=number; i++) { fact = fact * i; } System.out.println("Factorial of "+number+" is: "+fact); } } Task4: import java.util.Scanner; public class PalindromeChecker { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter a string: "); String input = scanner.nextLine(); if (isPalindrome(input)) { System.out.println("The given string is a palindrome."); } else { System.out.println("The given string is not a palindrome."); } scanner.close(); } public static boolean isPalindrome(String str) { String cleanStr = str.replaceAll("[^a-zA-Z0-9]", "").toLowerCase(); String reversedStr = new StringBuilder(cleanStr).reverse().toString(); return cleanStr.equals(reversedStr); } } Task 5: import java.util.Scanner; public class PrimeChecker { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter a number: "); int number = scanner.nextInt(); boolean isPrime = true; if (number <= 1) { isPrime = false; } else { for (int i = 2; i <= Math.sqrt(number); i++) { if (number % i == 0) { isPrime = false; break; } } } if (isPrime) { System.out.println(number + " is a prime number."); } else { System.out.println(number + " is not a prime number."); } scanner.close(); } }
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