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

reading partial code from external site
Hi,

I am trying to write a script for my website to get an article from an external website.

start new row of pictures
on my site www.budstreasureauctions.com there is a featured auctions box that users will pay to get

Extracting Long text from message class with parameters
Hi,

I would like to extract the long text from a message class. However, the long text ha

Change Age automatically
hi guys . im new to php , is it possible to change age value in mysql automatically when year change

filesize() returns 0
I have a socket program that runs in an infinite loop, listening for connections, in this socket I h

Seperate team from score
I am writing a site that does a NFL Pick 'em type application and I have a feed that gives me the sc

Help with PHP Email Script
Hi guys,

I'm a newbie to php and need help with the script below:

At the moment when I

progress bar...need expert opinion of experienced webmaster
Hey guys, quick question:

I want to display a progress bar when I upload files, but I am not

How to use Substr
I want to check for the word CATEGORY: inside a string which can be CATEGORY: ITEM
and remove the

Multiple includes losing variables
Hey all,

just starting out w php and ran into a problem pretty quickly. I'm
including seve