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

Help with PHP Calendar code...
Hello, I'm new to this forum and I'm glad I found it.
I wrote this code for a PHP calendar as an

PHP MySQL Return Results Issue
Hi guys,

I'm running joomla and made a module which is using ajax.
Basically i just have a

Allegro crashes when running load_bitmap. Why?
I can not get Allegro to load any BMP images. Here is a section of test code. The picture is in the

retrieving images from mysql database using php
So I've been trying to figure out how to store images in a mysql database, and as far as i can tell

Need a Timecode Class...
Not a Time Stamp, Time Code. Format is a bit different. HH:MM:SS:FF where FF is Frames. I dont re

Preg_match unknown modifyer
Hello,

Im trying to write a little script for my forums i need to get the reply from my forum

How to ask a regex question?
Hi, I thought I'd share some of my insight after seeing too many bad questions that either get ignor

dropdown menu
Hello everbody,

I am php newbie.
I need to develop a program that once click the drop do

Simple MySQL query...
Hello,
How could I do a mysql query that does this: SELECT * WHERE date/time < 5minutes ag

OOP help
okay so i have a class im making it has everything setup i just need to randomize the 2 variables an