Verify a number is Even/Odd and Swapping Numbers without using 3rd variable

import java.util.Scanner;

public class EvenOdd{

public static void main(String[] args){

Scanner in = new Scanner(System.in);

System.out.println("Enter a number which you want to check whether that is even or odd");

int n = in.nextInt();

if(n%2==0){

System.out.println(n+" is an even number.");

}else{

System.out.println(n+" is an odd number.");

}

}

}

Output:

Enter a number which you want to check whether that is even or odd

4

4 is an even number.

  

Odd and Swapping Numbers without using 3rd variable

import java.util.Scanner;

public class Swapping{

public static void main(String[] args){

Scanner in = new Scanner(System.in);

System.out.println("Enter the 1st number: ");

int x = in.nextInt();

System.out.println("Enter the 2nd number: ");

int y = in.nextInt();

System.out.println("Initial value of x: "+x+" and y: "+y);

x = x+y;

y = x-y;

x = x-y;

System.out.println("After swapping value of x: "+x+" and y: "+y);

}

}

Output:

Enter the 1st number:

43

Enter the 2nd number:

56

Initial value of x: 43 and y: 56

After swapping value of x: 56 and y: 43