Thread: Class/linking question - getting odd error

I'm trying to build a stack class. Bascailly it consists of the following files:

Code:

// listnode.h
#ifndef LISTNODE_H
#define LISTNODE_H

class ListNode {
public:    
    int data; // stores the integer
    ListNode *next; // pointer to next ListNode
};


#endif

Code:

// stack.h
#ifndef STACK_H
#define STACK_H

#include "listnode.h"

class Stack {

public:
    Stack(); // constructor
    ~Stack(); // destructor
    int pop(); // remove top item in stack
    void push(int); // add item to stack
    int top(); // return item from top of stack
    void print(); // print contents of stack
    bool isEmpty(); 
    
private:
    ListNode *topNode; // top listnode in list
};

#endif

Code:

// stack.cpp
#include <iostream>
using std::cout;

#include "stack.h"

// constructor
Stack::Stack() {
    topNode = NULL;
}

// destructor
Stack::~Stack() {
    delete topNode;
}

void Stack::push(int item) {
    ListNode *node = new ListNode();
    node->data = item;
    node->next = topNode;
    topNode = node;
}

int Stack::pop() {
    assert(topNode != NULL);
    int temp = topNode->data;
    topNode = topNode->next;
    return temp;
}

void Stack::print() {
    ListNode *node = topNode;
    
    while(node != NULL) {
        cout << node->data << ' ';
    }
    
    if(node == NULL)
        cout << "Stack is empty!";
}

.. etc

When I compile a file called stacktest.cpp I get the following error:

stacktest.cpp request for member `print' in `testStack', which is of non-class type `Stack ()()'

That file basically looks as follows:

Code:

// stackTest.cpp
#include <iostream>
using std::cout;
using std::cin;

#include "stack.h"

int main() {
    Stack testStack();
    testStack.print();
        
    cin.get();
    return 0;
}

Any ideas as to what I've done incorrectly?

I think I was incorrect in using Stack testStack(). Anyhow, I changed it to Stack testStack, but now I get the following:

stacktest.cpp: undefined reference to `Stack:rint()'

Yes, it was a linking problem, but it's sorted out now.

Thanks for your assistance laserlight. Stay cool man.