Java Program to Find Factorial

In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example,

The value of 0! is 1, according to the convention for an empty product

 import java.util.Scanner;
  public class Factorial {
  public static void main(String[] args) {
    int num  ,fact=1;
    System.out.println("enter number:");
    Scanner sc=new Scanner(System.in);

    num=sc.nextInt();
    if(num<0){
    System.out.println("only positive number !");
   }
   else{

    for(int i=1;i<=num;i++)
    {
     fact=fact*i;
    }
    System.out.println("the factorial of "+num + " is " +fact);
    }
   }
 }

Output:
=======

 enter number: 3
 the factorial of 3 is 6