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

Function to extract email attachments using PHP IMAP
function extract_attachments($connection, $message_number) {

$attachments = array();

Trouble verifying database password
Thankyou to everyone who responded to my last post (I can't find the posting, it has been buried). <

Last character removed
I have created a string from an array. I have inserted commas from my form values. I am trying to re

Sufficient protection from bad input?
I am writing a simple script to let people upload 'pages' of their own content, be it simply a few b

help with image text
Hi ...

see i need the text of the name and number to start in the center and always be in the

Where is my php.ini???
Hi

First off - apologies - i'm not a coder so this may sound very amateur.

I'm having

Points for Wiki contribution
Hi everyone,

I want to know how long does it take for the moderator to award points for a

writing my own sobel filter convolution - something is wrong
I am trying to keep it very simple, I cant see anything wrong with my logic, could anybody help poin

how to insert value
I am having file bookissueadd.php..... in which i am having tag

<td height="21&q

This must be easy , pulling the last record of the day, every day, from a txt
I have a txt file logging weather data every minutes (so 1 record per minute). I want to extract the