DZone
Thanks for visiting DZone today,
Edit Profile
  • Manage Email Subscriptions
  • How to Post to DZone
  • Article Submission Guidelines
Sign Out View Profile
  • Post an Article
  • Manage My Drafts
Newsletter
Log In / Join
Refcards Trend Reports
Events Video Library
Refcards
Trend Reports

Events

View Events Video Library

Related

  • Stop Writing Database Migration Scripts: Declarative Schema Sync for Java
  • Searching Kafka Without an Index: Lessons From Building Message Search for Kafdrop
  • ScyllaDB in Enterprise Java: High-Performance NoSQL With Eclipse JNoSQL
  • Member Spotlight: Shai Almong

Trending

  • Should Developers Switch From SQLite to DuckDB?
  • SSRF Prevention in C#: Securing File Imports From User-Supplied URLs
  • Delta Lake UniForm to Snowflake: Cross-Platform Table Access Without a Second Copy
  • Giving AI Agents Safe Access to Legacy Systems: Introducing legacy2mcp

Draft This article hasn't been published, so readers can't see it.

In moderation This article is waiting for review, so readers can't see it yet.

Deleted This article has been deleted, so readers can't see it.

  1. DZone
  2. Coding
  3. Java
  4. How to generate Hailstone Sequence in Java?

How to generate Hailstone Sequence in Java?

By 
Jagadeesh Motamarri
·
Sep. 20, 13 · Interview
Post on X (opens in a new tab) Share on LinkedIn (opens in a new tab)
31.8K Views

Join the DZone community Save articles, join the discussion, and download Refcards and Trend Reports with a free account.

Join for free Already a member? Log in

Program Statement

How to generate Hailstone Sequence in Java?

Solution

The Hailstone sequence of numbers can be generated from a starting positive integer, n by:

  • If n is 1 then the sequence ends.
  • If n is even then the next n of the sequence = n/2
  • If n is odd then the next n of the sequence = (3 * n) + 1

Code

?
package com.skilledmonster.examples.operations;
import java.util.Scanner;
/**
* Program to generate Hailstone Sequence.
* This program reads a number from the user then displays the Hailstone sequence
* for that number followed by a line that shows the number of steps taken to reach 1.
*
* @author Jagadeesh Motamarri
* @version 1.0
*/
public class HailstoneSequenceGenerator {
public static void main(String[] args) {
Scanner inputScanner = new Scanner(System.in);
System.out.printf("Enter a Number:  ");
try {
int number = inputScanner.nextInt();
int steps = 0;
while (number != 1) {
if (number % 2 == 0) {
System.out.println(number + " is even, so I take half: " + number / 2);
number /= 2;
} else {
System.out.println(number + " is odd, so I make 3n + 1: " + (number * 3 + 1));
number = number * 3 + 1;
}
steps++;
}
System.out.println("The process took " + steps + (steps < 2 ? " step" : " steps") + " to reach 1");
} catch (Exception e) {
System.out.println("Not a Number!! Run your Program again <img src="http://www.skilledmonster.com/wp-includes/images/smilies/icon_smile.gif" alt=":-)" class="wp-smiley"> ");
}
}
}

Output

hailstone_sequence   

As shown in the console output, for interger 17, it took 12 steps to reach 1 using Hailstone Sequence.

References

http://en.wikipedia.org/wiki/Collatz_conjecture


Java (programming language)

Published at DZone with permission of Jagadeesh Motamarri. See the original article here.

Opinions expressed by DZone contributors are their own.

Related

  • Stop Writing Database Migration Scripts: Declarative Schema Sync for Java
  • Searching Kafka Without an Index: Lessons From Building Message Search for Kafdrop
  • ScyllaDB in Enterprise Java: High-Performance NoSQL With Eclipse JNoSQL
  • Member Spotlight: Shai Almong

Partner Resources

×

Comments

Loading comments

The comments didn't load

Please try again in a moment.

Likes

Loading

The next likes didn't load. Please try again.

The likes didn't load

Please try again in a moment.

See who liked this

Log in or join DZone for free to see who liked this article.

Log in Join for free
  • RSS
  • X
  • Facebook

ABOUT US

  • About DZone
  • Support and feedback
  • Community research

ADVERTISE

  • Advertise with DZone

CONTRIBUTE ON DZONE

  • Article Submission Guidelines
  • Become a Contributor
  • Core Program
  • Visit the Writers' Zone

LEGAL

  • Terms of Service
  • Privacy Policy

CONTACT US

  • 3343 Perimeter Hill Drive
  • Suite 215
  • Nashville, TN 37211
  • [email protected]

Let's be friends:

  • RSS
  • X
  • Facebook