JAVA CODE SPOT: JAVA Programming : Factorial

Sunday, January 29, 2012

JAVA Programming : Factorial

JAVA Factorial

Factorial is a mathematical operation Factorial of a positive number n is denoted by n! and defined as the product of all numbers from 1 to the n. The syntax of factorial of number n is:

n! = n*(n-1)*(n-2)*(n-3)......2*1

For Example:-

7! = 7 × 6 × 5 × 4 × 3 × 2 × 1 = 5040

Note:- Factorial of zero is 1 (i.e. 0! = 1).

import java.util.Scanner;

 public class Factorial {

  public int fact(int n){

    int fact =1;

    for (int i =1 ; i <= n; i++) {

      fact=fact*i;

    }

    return fact;

  }



   public static void main(String[] args) {

    Factorial f = new Factorial();

    System.out.println("Enter a Nu4mber");

    Scanner scan = new Scanner(System.in);

    int num = scan.nextInt();

    int result = f.fact(num);

    System.out.println("Facotial of "+num+" is "+result);

  }

}