Factorial Program in Java

This java program finds factorial of a number. Factorial of a number is the product of all positive descending integers.

For Example:

6! = 6*5*4*3*2*1 = 720

Java Program to Find Factorial of a Number

import java.util.Scanner;
class JavaFactorial
{
 public static void main(String[] args) { 
     Scanner sc = new Scanner(System.in);
     System.out.print("Enter a number to find factorial : "); 
     int num = sc.nextInt();
     long factorial = 1;
     for(int i = num; i > 0; --i)
     {
        factorial *= i;
     }
     System.out.print("Factorial of "+num+" is "+factorial);
 }
}

Output:

Enter a number to find factorial : 6
Factorial of 6 is 720

Java Program to Find Factorial of a Number Using Recursion

import java.util.Scanner;
class JavaFactorial
{
    static int factorial(int n){    
    if (n == 0)    
      return 1;    
    else    
      return(n * factorial(n-1));    
    }    
    public static void main(String[] args) { 
 Scanner sc = new Scanner(System.in);
 System.out.print("Enter a number to find factorial : "); 
 int num = sc.nextInt();
 long factorial = factorial(num);  
 System.out.print("Factorial of "+num+" is "+factorial);
    }
}

Output:

Enter a number to find factorial : 6
Factorial of 6 is 720