write a java program to find the factorial using while loop and for loop and write a program to swap number in java.

Find the factorial using for loop.........

import java.util.Scanner;
class Ashraf1
{
public static void main(String[] args)
{
int i,n;
long fact =1;
Scanner sc = new Scanner(System.in);
System.out.println("Enter the number:");
n= sc.nextInt();
for(i=1; i<=n; i++)
fact = fact*i;
System.out.println("The factorial of " + n + " is "+fact);
}
}

Output:

Enter the number:

6

The factorial of 6 is 720

Find the factorial using while loop............

import java.util.Scanner;

class Ashraf2

{

public static void main(String [] args)

{

int i=1, n;

long  fact = 1;

Scanner sc = new Scanner(System.in);

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

n = sc.nextInt();

while (i<=n)

{

 fact = fact*i;

i++;

}

System.out.println("The factorial of "+ n + " is " + fact);

}

}

Output:

Enter the number:

6

The factorial of 6 is 720

Swapping  the number using java...............

import java.util.Scanner;

class JavaExample1

{

public static void main(String[] args)

{

int num1, num2;

Scanner st = new Scanner(System.in);

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

num1=st.nextInt();

Scanner mt= new Scanner (System.in);

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

num2= mt.nextInt();

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

System.out.println(num1);

System.out.println(num2);

swap(num1,num2);

}

public static void swap(int num1,int num2)

{

int temp= num1;

num1 =num2;

num2 = temp;

System.out.println("After swapping ");

System.out.println(num1);

System.out.println(num2);

}

}

Output:

Enter the first number:

60

Enter the second number :

80

Before swapping 

60

80

After swapping 

80

60

Note: This all program firstly I run in my java compiler then I write on this page.