Java program for Factorial - to find Factorial of a Number.

Factorial of an Integer Number - This program will read an integer number and find the factorial of given integer number.

Find Factorial of a Number using Java program

/*Java program for Factorial - to find Factorial of a Number.*/

import java.util.*;

public class Factorial
{
	public static void main(String args[]){
		int num;
		long factorial;
		
		Scanner bf=new Scanner(System.in);
		
		//input an integer number
		System.out.print("Enter any integer number: ");
		num= bf.nextInt();
		
		//find factorial
		factorial=1;
		for(int loop=num; loop>=1; loop--)
			factorial*=loop;
		
		System.out.println("Factorial of " + num + " is: " + factorial);
	}
}

    
    [email protected]:~$ javac Factorial.java 
    [email protected]:~$ java Factorial
    Enter any integer number: 7
    Factorial of 7 is: 5040

Using function/Method

//Java program for Factorial - to find Factorial of a Number.

import java.util.*;

public class Factorial
{
	//function to find factorial
	public static long findFactorial(int num)
	{
		long fact=1;
		
		for(int loop=num; loop>=1; loop--)
			fact*=loop;
			
		return fact;
	}
	
	public static void main(String args[]){
		int num;
		long factorial;
		
		Scanner bf=new Scanner(System.in);
		
		/*input an integer number*/
		System.out.print("Enter any integer number: ");
		num= bf.nextInt();
		
		/*find factorial*/
		factorial=findFactorial(num);
		
		System.out.println("Factorial of " + num + " is: " + factorial);
	}
}