Solved

Learning Java PolynomialTester

Posted on 2008-11-02
5
218 Views
Last Modified: 2010-03-30
I am add method of getDescription to the Polynomial class  Method should return one of the 4 strings from the chart.  This method should take no input parameters.   Then add code to the main class that will prompt the user to enter the number of terms in a polynomial.

Chart is
             Number of Terms            Description
                    1                                  monomial
                    2                                  binomail
                    3                                  trinomial
                    4 or more                    Polynomial(no special name)

Output should read:
How many ters are in the polynomial function?
2
The fucntion is a binomial

Any help would greatly be appreciated.

***********************************
package polynomialtester;
import javax.swing.JOptionPane;
public class PolynomialTester {
   
    public static void main(String[] args)
    {
    String input;
    int numTerms;
   
    input = JOptionPane.showInputDialog("How many terms are in the polyomial funcions?");
   numTerms = int.parseInt(input);      
    }

}
*********************************
package polynomialtester;

public class Polynomial
{
    public Polynomial(int initTerms)
    {
        numTerms = initTerms;
    }
    public int getTerms()
    {
    return numTerms;
    }
  public int getDescription(int numTerms)
    {
      String monomial;
      String binomail;
      String trinomial;
      String Polynomial;
         
        switch(numTerms)
        {
              case 1 : return "monomial";
              case 2 : return  "binomail";
              case 3 : return "trinomial";
              default :
                    if(numTerms >= 4)
                    {
                          return "polynomial";
                    }
         }
         // HERE BELONGS A return FOR ALL OTHER CASES.
     }        
               
    private int numTerms;  
   
}

0
Comment
Question by:ca1358
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
5 Comments
 
LVL 24

Expert Comment

by:sciuriware
ID: 22865233
The following lines have no purpose and should be deleted:

    public Polynomial(int initTerms)
    {
        numTerms = initTerms;
    }
    public int getTerms()
    {
    return numTerms;
    }
and:
      String monomial;
      String binomail;
      String trinomial;
      String Polynomial;

;JOOP!
0
 

Author Comment

by:ca1358
ID: 22865244
public Polynomial(int initTerms)
    {
        numTerms = initTerms;
    }
    public int getTerms()
    {
    return numTerms;
    }
The exercise has this start and must include the above in the class.
0
 
LVL 24

Expert Comment

by:sciuriware
ID: 22865255
Some lines added:

    public static void main(String[] args)
    {
    String input;
    int numTerms;
   
    input = JOptionPane.showInputDialog("How many terms are in the polyomial funcions?");

    try // Checking input, prepare for errors:
    {
          numTerms = int.parseInt(input);
          System.out.println("That function is " + Polynomial.getDescription(numTerms);
    }
    catch(ParseException e)
    {
           System.err.println("Bad input:  " + input);
    }

the other class changes too:

  public static int getDescription(int numTerms)
    {
      String monomial;
      String binomail;
      String trinomial;
      String Polynomial;
         
        switch(numTerms)
        {
              case 1 : return "monomial";
              case 2 : return  "binomail";
              case 3 : return "trinomial";
              default :
                    if(numTerms >= 4)
                    {
                          return "polynomial";
                    }
         }
         return("Illegal number.");
     }        

The private int at the bottom can be deleted too.
Unless you insist in creating an object for Polynomial ......................

;JOOP!
0
 
LVL 24

Expert Comment

by:sciuriware
ID: 22865263
I was typing while you answered.
You should have listed the exercise first!

Now the code changes a bit.

;JOOP!
0
 
LVL 24

Accepted Solution

by:
sciuriware earned 500 total points
ID: 22865286
***********************************
package polynomialtester;
import javax.swing.JOptionPane;
public class PolynomialTester
{
    public static void main(String[] args)
    {
    String input;
    int numTerms;
   
    input = JOptionPane.showInputDialog("How many terms are there in the polynomial function?");
    try // Checking input, prepare for errors:
    {
          numTerms = int.parseInt(input);
          Polynomial p = new Polynomial(numTerms);
          System.out.println("That function is " + p.getDescription();
    }
    catch(ParseException e)
    {
           System.err.println("Bad input:  " + input);
    }
}
*********************************
package polynomialtester;

public class Polynomial
{
               
    private int numTerms;  // Declaration on top!!!

   
    public Polynomial(int initTerms)  // Constructor
    {
        numTerms = initTerms;
    }
    public int getTerms()     // Unused now.
    {
    return numTerms;
    }

     public int getDescription()  // No argument, it was already given!
     {
        switch(numTerms)
        {
              case 1 : return "monomial";
              case 2 : return  "binomail";
              case 3 : return "trinomial";
              default :
                    if(numTerms >= 4)
                    {
                          return "polynomial";
                    }
         }
         return("Illegal number.");
     }        
}

;JOOP!
0

Featured Post

Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
Whether you’re a college noob or a soon-to-be pro, these tips are sure to help you in your journey to becoming a programming ninja and stand out from the crowd.
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

627 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question