Java Factorial Using Recursion and java swap pro

Java Factorial

public class NumberFactorial

{

public static void main(String[] args)

{

int number = 5;

int factorial = number;

for(int i =(number - 1); i > 1; i--)

{

factorial = factorial * i;

}

 System.out.println("Factorial of a number is " + factorial);

  }

}

Java Factorial Using Recursion

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class JavaFactorialUsingRecursion

 {

 public static void main(String args[]) throws NumberFormatException, IOException

{

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

             

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

int a = Integer.parseInt(br.readLine());

int result= fact(a);

System.out.println("Factorial of the number is: " + result);

}

 static int fact(int b)

{

if(b <= 1)

return 1;

else

return b * fact(b-1);

}

}

Swap Numbers Without Using Third Variable

public class SwapElementsWithoutThirdVariableExample

{

 public static void main(String[] args)

                    {

int num1 = 10;

int num2 = 20;            

System.out.println("Before Swapping");

System.out.println("Value of num1 is :" + num1);

System.out.println("Value of num2 is :" +num2);                

num1 = num1 + num2;

num2 = num1 - num2;

num1 = num1 - num2;

System.out.println("Before Swapping");

System.out.println("Value of num1 is :" + num1);

System.out.println("Value of num2 is :" +num2);

 }

}