Factorial Program In Java

1. Factorials are very simple things. They're just products, indicated by an exclamation mark. For instance, "four factorial" is written as "4!" and means 1×2×3×4 = 24. In general, n! ("enn factorial") means the product of all the whole numbers from 1 to n; that is, n! = 1×2×3×...×n.

import java.util.Scanner;

public class Factorial
{

public static void main(String[] args)
{

Scanner scn =new Scanner(System.in);
System.out.println("enter a no. to find factorial");
int n=scn.nextInt();
int fact=1;
for(int i=1;i<=n;i++)
{
fact=fact*i;
}
System.out.println("factorial of "+n+" is ="+fact);


}

}



Factorial Using Recursion

public class FactorialRecursion {

public static void main(String[] args) {

int n=5;
System.out.println(fact(n));


}
public static int fact(int n)
{
if(n<=1)
return 1;
else
return n*fact(n-1);

}

}