Question

I need to create two separate linked lists and then compare them. However, when I try to create a second list with the same operator overloading for the constructor, I get an error:

“A value of type polynomial2* cannot be used to initialize an entity of the type polynomial*”

Here is my code for that sections:

Header:

#include <iostream>
#include <string>

using namespace std; 

struct polynomial
{ 
    polynomial();
    polynomial(string newCoefficient, string newPower, polynomial *nextPtr);
    string coefficient;
    string power;
    polynomial *next; 
};

struct polynomial2
{ 
    polynomial2();
    polynomial2(string newCoefficient2, string newPower2, polynomial2 *nextPtr2);
    string coefficient2;
    string power2;
    polynomial *next2; 
};

class linkedList
{
public:
    linkedList();
    void callFunctions();
private:
    polynomial *head;
    polynomial2 *head2;
    void makeList(polynomial *head, polynomial2 *head2);
    void showList(polynomial *head);
    void compareNodes(polynomial *head, polynomial2 *head2);
};

#endif
/* defined(__Assignment3__Polynomial__) */

.CPP Code:

linkedList::linkedList()
{
    head = 0; 
};

polynomial::polynomial()
{
    coefficient = " "; 
    power = " "; 
    next = NULL;
};

polynomial2::polynomial2()
{
    coefficient2 = " "; 
    power2 = " "; 
    next2 = NULL
};

polynomial::polynomial(string newCoefficient, string newPower, polynomial *nextPtr )
    :
coefficient(newCoefficient),
    power(newPower), 
    next(nextPtr) 

{}

polynomial2::polynomial2(string newCoefficient2, string newPower2, polynomial2 *nextPtr2)
    :
coefficient2(newCoefficient2),
    power2(newPower2), 
    next2(nextPtr2)

{}

The error appears on the last line of the .cpp file at “next2(nextPtr2)”. “nextPtr2” is underlined

Answer 1

In your polynomial2 definition, did you mean to put:

polynomial2 *next2;

instead of

polynomial *next2;