To Check Prime Number

package com.tutorial4u;

import java.util.Scanner;

public class PrimeNumber {

       public static void main(String[] args) {

             int temp ;

             boolean isPrimeNumber = true;

             System.out.print("Please enter a number to check prime : ");

             Scanner sc = new Scanner(System.in);

             int num = sc.nextInt();

             for(int i=2;i<num/2;i++){

                    temp = num%i;

                    if(temp==0){

                           isPrimeNumber = false;

                           break;

                    }

             }

             if(isPrimeNumber){

                    System.out.println(num +" is Prime Number");

             }else{

                    System.out.println(num +" is not Prime Number");

             }

       }

}

Output:

Please enter a number to check prime : 23

23 is Prime Number

Palindrome Number

package com.tutorial4u;

import java.util.Scanner;

public class PalindromeNumber {

       public static void main(String[] args) {

             int num, reverse=0,temp;

             System.out.print("Please enter any number to check palindrome : ");

             Scanner sc = new Scanner(System.in);

             num = sc.nextInt();

            

             temp = num;

             while(num!=0){

                    reverse = reverse*10;

                    reverse=reverse+num%10;

                    num= num/10;

             }

             if(temp == reverse){

                    System.out.println("Given number is palindrome");

             }else{

                    System.out.println("Given number is not palindrome");

             }

       }

}

Output:

Please enter any number to check palindrome : 121

Given number is palindrome

Even Or Odd Number Without (%,/) Operator

package com.tutorial4u;

import java.util.Scanner;

public class EvenOrOdd {

       public static void main(String[] args) {

             System.out.print("Enter a num to check even or odd : ");

             Scanner sc = new Scanner(System.in);

             int num = sc.nextInt();

             if((num&1) == 0){

                    System.out.println("Given number is Even ");

             }else{

                    System.out.println("Given number is Odd");

             }

       }

}

Output: 

Enter a num to check even or odd : 34

Given number is Even