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[java] problem with my function

Started by omegasyphon Apr 26, 2003 at 6:40 PM 3 replies 950+ views

Original Post

Apr 26, 2003 at 6:40 PM

here is my problem i have this function that will multiply numbers together and keep them sorted in a linked list.

    
public Polynomial multiplyPoly( Polynomial rhs)
  {
    LinkedListIterator itr = myPoly.first();
    LinkedListIterator ritr = rhs.getPoly().first();
    Polynomial poly  = new Polynomial();
    Polynomial temp  = new Polynomial();

    while (ritr.isValid())
    {
      while (itr.isValid())
      {
                 temp.addTerm(((Term)itr.retrieve()).multiply((Term)ritr.retrieve()));
        itr.advance();
      }
       poly.addpoly(temp);
      ritr.advance();
      itr = myPoly.first();
    }

    return poly;
  }

now addpoly just adds 2 polynomials together and returns the sum as a polynomial. now i can call addpoly just fine in main. but when i call it in the function above it returns nothing. im not sure why? [edited by - omegasyphon on April 26, 2003 7:42:35 PM]

Malone1234

Apr 28, 2003 at 11:27 PM

Post your addpoly() function. What is the return type? If it''s void then I don''t knwo what the problem is, but if it returns a Polynomial object, then you haven''t assigned that to anything.

omegasyphon

Apr 29, 2003 at 2:32 PM

ok heres the add function. it returns a polynomial object.

  

public Polynomial addPoly(Polynomial rhs)
  {
    LinkedListIterator itr = myPoly.first();
    LinkedListIterator ritr = rhs.getPoly().first();
    Polynomial npoly = new Polynomial();
    while (itr.isValid() && ritr.isValid())
    {
      if (((Term)itr.retrieve()).compareTo(ritr.retrieve())==-1)
      {
        npoly.addTerm((Term)itr.retrieve());
        itr.advance();
      }
      else if (((Term)ritr.retrieve()).compareTo(itr.retrieve())==-1)
      {
        npoly.addTerm((Term)ritr.retrieve());
        ritr.advance();
      }
      else if (((Term)itr.retrieve()).compareTo(ritr.retrieve())==0)
      {
        npoly.addTerm(((Term)itr.retrieve()).add((Term)ritr.retrieve()));
        itr.advance();
        ritr.advance();
      }
    }

    return npoly;
  }

Jiim

Apr 29, 2003 at 3:36 PM

You need to change that poly.addPoly() line in your multiplyPoly() function to poly=poly.addPoly(). Should work then if there isn''t anything else wrong with it.

Jiim Jonez
--
www.develop-games.com

omegasyphon

Apr 29, 2003 at 5:15 PM

this works:
poly=poly.addpoly(temp);

but only when i do this after i create the poly

poly.addterm(new Term(0,0));

ok i fixed the problem. it finally works

[edited by - omegasyphon on April 29, 2003 7:11:54 PM]

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