0

Hi...

my programs compiles and runs fine...but i still get this error..what am i doing wrong in here...

its suppose to print polynomials...

```
import java.util.*;
public class PolyTest {
{
public static void main(String[] args)
{
Scanner stdin =new Scanner(System.in);
Polynomial polynomial = new Polynomial();
int coefficients; //= { 2, 3, 4 };
int degree; //= { 3, 2, 1 };
System.out.println("Enter degree of polynomial");
degree = stdin.nextInt();
for(int i = degree; i >0; i--) {
System.out.println("Enter coefficient of the term x ^ " + i );
coefficients = stdin.nextInt();
polynomial.addTerm(coefficients, degree);
polynomial.print();
}
}
}
class Polynomial
{
private LinkedList terms;
/**
Construct a Polynomial object.
*/
public Polynomial()
{
terms = new LinkedList();
}
/**
Adds a polynomial.
@param p the polynomial to add
@return the new polynomial after addition
*/
public Polynomial add(Polynomial p)
{
Polynomial r = new Polynomial();
ListIterator iterator = terms.listIterator();
while (iterator.hasNext())
{
r.add((Term)iterator.next());
}
ListIterator pIterator = p.terms.listIterator();
while (pIterator.hasNext())
{
r.add((Term)pIterator.next());
}
return r;
}
/**
Adds a coefficient and degree as a new Term.
@param c the coefficient
@param d the degree
*/
public void addTerm( int c, int d)
{
add(new Term(c, d)); // <---ERROR HERE
}
/**
Adds a term.
@param t the new Term
*/
public void add(Term t)
{
int c = t.getCoeff();
int d = t.getDegree();
ListIterator iterator = terms.listIterator();
while (iterator.hasNext())
{
Term current = (Term)iterator.next();
if (d == current.getDegree())
{
if (c == -current.getCoeff())
iterator.remove();
else
current.add(c);
return;
}
else if (d < current.getDegree())
{
iterator.previous();
iterator.add(t);
return;
}
}
iterator.add(t);
}
/**
Prints the polynomial.
*/
public void print()
{
ListIterator iterator = terms.listIterator();
String expression = "";
while (iterator.hasNext())
{
String next = "";
Term current = (Term)iterator.next();
if (current.getCoeff() != 0)
{
if (current.getCoeff() > 0 && iterator.hasNext())
{
next += " + ";
System.out.print(" + ");
}
next += current.getCoeff();
System.out.print(current.getCoeff());
if (current.getDegree() > 0)
{
next += " * x";
System.out.print(" * x");
if (current.getDegree() > 1)
{
next += "^" + current.getDegree();
System.out.print("^" + current.getDegree());
}
}
expression = next + expression;
}
}
System.out.println("\n" + expression);
}
}
class Term
{
public int coeff;
public int degree;
/**
* constructor has no return in its signature
*/
public Term(int c, int d) // <<******* fixed *******
{
coeff = c;
degree = d;
}
/**
Adds a coefficient.
@param c the coefficient to add
*/
public void add(int c) // methods require a return type in their signature
{ // a return type of "void" -> nothing is returned
coeff += c; // from the method. what you return from the method
} // must match the return type in the signature
/**
Gets the coefficient.
@return the coefficient
*/
public int getCoeff()
{
return coeff;
}
/**
Gets the degree.
@return the degree
*/
public int getDegree()
{
return degree;
}
}
}
```