Java Program on Sum of Harmonic Series

Write a program to sum of Harmonic Series 1 + 1/2 + 1/3 + 1/4 + 1/5  

import java.util.Scanner;
public class HarmonicSeries
{
    public static void main(String args[])
    {
        int num ;
        Scanner sc = new Scanner( System.in );
        System.out.print("Input a number: ");
        num = sc.nextInt();
        double result = 0.0;
        while(num > 0){
            result = result + (double) 1 / num;
            num--;
        }
        System.out.println("Output of Harmonic Series is "+result);
    }
}