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Linkedlist in a Class

raijin011321 (18)
Hello, please help me how do I put these codes in a class (.cpp and header file)

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 #include <iostream>
#include <stdio.h>
using namespace std;

class Node
{
    public:
        int data;
        Node* next;

};

class Stack
{
    public:
        Node* top;
        Stack()
        {
            top = NULL;
        }


void push(int data)
{
    Node* node = new Node();
    node -> data = data;
    node -> next = top;
    top = node;
}

void pop()
{
    if(top==NULL)
    {
        cout << "Stack is empty!" << endl;
    }
    else
    {
        Node* temp = top;
        top = top -> next;
        delete temp;
    }
}

void display()
{
    if(top==NULL)
    {
        cout << "Stack is empty!" << endl;
    }
    else
    {
        Node* temp = top;
        while(temp!=NULL)
        {
            cout << temp -> data << " ";
            temp = temp -> next;
        }
        cout << endl;
    }
}
};


int main()
{
    Stack stack;

    int choice, data;

    while(1)
    {
        cout << "1. Push to stack" << endl;
        cout << "2. Pop from stack" << endl;
        cout << "3. Display stack" << endl;
        cout << "4. Exit" << endl;
        cout << "Enter your choice: ";
        cin >> choice;

        if(choice == 1)
        {
            cout << "Enter data to push: ";
            cin >> data;
            stack.push(data);
        }
        else if(choice == 2)
        {
            stack.pop();
        }
        else if(choice == 3)
        {
            stack.display();
        }
        else if(choice == 4)
        {
            break;
        }
        else
        {
            cout << "Invalid choice." << endl;
        }
    }
    return 0;
}
Last edited on
newbieg (764)
You'll have to split up declarations and definitions. That or use inline functions. Variables generally go in a private or protected section, and getter/setter functions are used to modify them.

Declarations of functions for the person class go in a header person.h:
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#ifndef PERSONCLASSWRAPPER
#define PERSONCLASSWRAPPER

#include <iostream>
#include <string>

class person
{
    public:
        person();
        void setString(std::string newText);
        void print();
    private:
        std::string text;

};

#ifndef


Person class definitions go in person.cpp;
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#include "person.h"
person::person()
{
    text = "This is set in person's constructor.";
}

void person::print()
{
    std::cout << text << std::endl;
}
void person::setText(std::string newText)
{
    text = newText;
}


And finally it comes together in main.cpp;
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#include "person.h"

int main()
{
    person bob;
    bob.print();
    bob.setText("Hello world!");
    bob.print();
}
Last edited on
raijin011321 (18)
How do i do that when i have 2 class (Node & Stack)? Thats bothering me
Last edited on
deleted account xyzzy (5768)
So you have a header and a source file for each class. If either class is part of the other you include the header of that class in the source file for the other class.

Or have a single header and source file for both classes.

raijin011321 (18)
Can you provide an example? I want to separate the class Node & class Stack by creating 2 header, is it possible? I tried to do it but it gives me an error.

Stack.cpp
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#include "Stack.h"

void push(int data)
{
    Node* node = new Node();
    node -> data = data;
    node -> next = top;
    top = node;
}

void pop()
{
    if(top==NULL)
    {
        cout << "Stack is empty!" << endl;
    }
    else
    {
        Node* temp = top;
        top = top -> next;
        delete temp;
    }
}

void display()
{
    if(top==NULL)
    {
        cout << "Stack is empty!" << endl;
    }
    else
    {
        Node* temp = top;
        while(temp!=NULL)
        {
            cout << temp -> data << " ";
            temp = temp -> next;
        }
        cout << endl;
    }
}


main.cpp
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#include <iostream>
#include "Stack.h"
#include "Node.h"
using namespace std;

int main()
{
    Stack stack;

    int choice, data;

    while(1)
    {
        cout << "1. Push to stack" << endl;
        cout << "2. Pop from stack" << endl;
        cout << "3. Display stack" << endl;
        cout << "4. Exit" << endl;
        cout << "Enter your choice: ";
        cin >> choice;

        if(choice == 1)
        {
            cout << "Enter data to push: ";
            cin >> data;
            stack.push(data);
        }
        else if(choice == 2)
        {
            stack.pop();
        }
        else if(choice == 3)
        {
            stack.display();
        }
        else if(choice == 4)
        {
            break;
        }
        else
        {
            cout << "Invalid choice." << endl;
        }
    }
    return 0;
}


Node.h
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#include <iostream>
using namespace std;
#ifndef NODE_H
#define NODE_H


class Node
{
     public:
        int data;
        Node* next;
};


#endif // NODE_H


Stack.h
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#include <iostream>
using namespace std;
#ifndef STACK_H
#define STACK_H


class Stack
{
    public:
        Node* top;
        Stack()
        {
            top = NULL;
        }
};



#endif // STACK_H

deleted account xyzzy (5768)
Your Stack class uses the Node struct, you need to include the Node header in your Stack source file. Before your Stack header include.
raijin011321 (18)
The errors has been reduced, but I still have errors it says that class Stack has no member name push/pop/display. And 'top' was not declared in this scope.
newbieg (764)
In your stack.cpp file, you need to tell the compiler that the functions are owned by the stack class.
A function definition for the stack class should look like this:
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void stack::pop()
{
    //code for pop function
}

Last edited on
raijin011321 (18)
Oh i see, its now working. Thanks a lot to those who help :D
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