LinkedList help

Posted on 16th Feb 2014 07:03 pm by admin

Ok so I just learned quickly about lists, so I have a not too hard project I think, but am having a few issues:

Here is the project. Create a lovely polynomial calculator, that takes the equation from the user, and a number for x.
Then solve it, but I have to use lists. As well as that I have to printout the equation with x at the end. And I will also have to have to add a method for finding the derivative of the equation.

I'll worry about the printout and the derivative at the end, except I have a problem right now... I'll show my code first



Here is the lovely main
Code: import java.util.*;public class PolyDriver { public static void main(String[] args) { boolean isrunning = true; String userinput="no"; String no="no"; String yes="yes"; double whatisx=0; Scanner scan = new Scanner(System.in); System.out.println("What is X?"); whatisx =scan.nextDouble(); while(userinput.equals(no)) { System.out.println("Enter the first integer"); double d = scan.nextDouble(); System.out.println("Enter the exponent"); int e = scan.nextInt(); Poly m = new Poly(d, e, whatisx); System.out.println("Done?"); String j = scan.next(); if(j.equals(yes)) { System.exit(0); } } // System.out.println("Enter the number for x"); // Scanner scan = new Scanner(System.in); }}



Then here is the Poly class


Code: import java.util.*;/* * To change this template, choose Tools | Templates * and open the template in the editor. *//** * * @author JigglyWiggly-laptop */public class Poly { double integer=0; int exponent=0; double variable=0; double vrz=0; double whatisx=0; LinkedList linkedlist = new LinkedList(); public Poly(double d, int e, double x) { integer=d; exponent=e; whatisx=x; calculations(); // calculations(); } public double calculations() { double v = Math.pow(whatisx, exponent); double j = v*integer; linkedlist.add(j); printout(); return j; } public double printout() { for(int i=0; iWhen I run it:
Code: run:What is X?2Enter the first integer2Enter the exponent2---18.0Done?noEnter the first integer2Enter the exponent2---18.0Done?noEnter the first integer2Enter the exponent2---18.0Done? Why does it not make the list bigger? And the numbers should be adding up. Any ideas?

(Also ignore the funky way of getting the user input, this is the way we were told to do so)

No comments posted yet

Your Answer:

Login to answer

318 44

Tweet

Other forums

How do I send data using an html link
Hi

If I have
<a href="main_file.php">

How do I send data t

PHP5 - AJAX help
I've been following the tutorial on w2schools (http://www.w3schools.com/php/php_ajax_database.asp) a

Inserting a variable in a link
I have this code that I want to insert for my own variable but I have no idea how. This is what I wa

present value of sequence?
Hi

Please help me to find out the present value of sequence?

Thanks

How to pass parameter to tag query?
Hi,
I want to get the value of a tag at a specific time (like 10/27/09 15:29:59), I need to giv

Database connection failure
Hello All,

I am trying to create new connection to Oracle DB 10.1,
I could not see a

Create a form of 2 numbers input and find the greatest.
Hi, everybody.

I have a homework in my training of php, which ask you to make a form that ask

Inserting the current date/time while submitting the forum
What do I need to add below to update the current date/time? I have a field in the database called d

drop-down with sub-category appear
Hello,

i know how to build a simple dro-down list, im looking for a code when im gonna choose

php wont update my db
hello,

sorry for posting in mysql forum but i dont know where exactly is the problem but here