Help me ! Link list code in OOP C++

This is the code wrote inOP C++ ! I don't know what error it has ? please help me !

Code:

---

#include <iostream.h>

template <class T>
//define struct link list
struct Node
{
        T data;
        Node<T>* link;
};

template <class T>
//class link list
class dslk
{
        private:
                Node<T>* head;
        public:
                dslk();
                ~dslk();
                void addhead(T);  //add to head
                void print();
};

template <class T>
dslk<T>::dslk()
{
        head = NULL;
}

template <class T>
dslk<T>::~dslk(){}

template <class T>
dslk<T>::addhead(T key)
{
        Node<T>* NEW;
        NEW = new Node<T>;
       
        NEW->data = key;
        NEW->link = head;
        head = NEW;
}

template <class T>
dslk<T>::print()
{
        Node<T>* p = head;
        cout << "Cac phan tu trong danh sach la : ";
        while (p)
        {
                cout << p->data << "  ";
                p = p->link;
        }
}

void main(void)
{
        dslk<int> a;  // create a
        a.addhead(1);
        a.addhead(2);
        a.addhead(3);
        a.print();
}

---

Quote:

---

Originally Posted by phoenix2007

This is the code wrote inOP C++ ! I don't know what error it has ? please help me !

---

Perhaps post the error(s)?

Quote:

---

main.cpp:35: error: ISO C++ forbids declaration of `addhead' with no type
main.cpp:35: error: prototype for `int dslk<T>::addhead(T)' does not match any in class `dslk<T>'
main.cpp:20: error: candidate is: void dslk<T>::addhead(T)
main.cpp:35: error: template definition of non-template `int dslk<T>::addhead(T)'
main.cpp:46: error: ISO C++ forbids declaration of `print' with no type
main.cpp:46: error: prototype for `int dslk<T>::print()' does not match any in class `dslk<T>'
main.cpp:21: error: candidate is: void dslk<T>::print()
main.cpp:46: error: template definition of non-template `int dslk<T>::print()'
main.cpp:57: error: `main' must return `int'

---

Code:

---

error C2244: 'dslk<T>::addhead' : unable to resolve function overload
error C2954: template definitions cannot nest
error C2244: 'dslk<T>::print' : unable to resolve function overload
error C2065: 'a' : undeclared identifier
error C2228: left of '.addhead' must have class/struct/union type
error C2228: left of '.addhead' must have class/struct/union type
error C2228: left of '.addhead' must have class/struct/union type
error C2228: left of '.print' must have class/struct/union type

---

Here are errors ! Please help resolve them ! I can't ! thanks a lots !

(These code were wrote in VS C++ 6.0)

Code:

---

#include <iostream.h>

---

Wrong.

Code:

---

#include <iostream>

---

Code:

---

void main(void)

---

Wrong.

Code:

---

int main ()

---

If you don't know these simple porblems, what makes you think you can take on templates and classes?

Quote:

---

Originally Posted by manutd

Code:

---

#include <iostream.h>

---

Wrong.

Code:

---

#include <iostream>

---

Code:

---

void main(void)

---

Wrong.

Code:

---

int main ()

---

If you don't know these simple porblems, what makes you think you can take on templates and classes?

---

Oh ! I wrote

Code:

---

void main(void)

---

It' s not wrong ! Because, in main functiuon, if I write follow you ! i have to return a value, That's thing I don't want !

Code:

---

#include "iostream.h"

---

instead of #include <iostream>. They are the same ! No fault !

Quote:

---

Originally Posted by phoenix2007

Code:

---

void main(void)

---

It' s not wrong !

---

It's wrong. Read the FAQ.

oh ! I'm sorry ! I've just remember !

Code:

---

void main(void)

---

just right in C, not in C++. If in C++, must write :

Code:

---


void main()

---

Is that ok ?

Quote:

---

It' s not wrong ! Because, in main functiuon, if I write follow you ! i have to return a value, That's thing I don't want !

---

It's wrong in that it is non-standard. Declare main() with a return type of int. You still do not need to return a value explicitly as the global main() function is special in that it will return 0 if control reaches its end and no return statement is encountered.

Quote:

---

instead of #include <iostream>. They are the same ! No fault !

---

<iostream.h> is pre-standard. The standard header is <iostream>. "iostream.h" would be some user defined header.

Yes you are wrong with iostream.h and void main. Newer compilers dont have iostream.h anymore.

Anyway, try rewriting the complete templates in the header file and see what that fixes

Yes, thanx all ! I fixed them follow you ! but, it still has 8 errors !

Quote:

---

it still has 8 errors !

---

What might they be?

Quote:

---

Originally Posted by laserlight

What might they be?

---

error C2244: 'dslk<T>::addhead' : unable to resolve function overload
error C2954: template definitions cannot nest
error C2244: 'dslk<T>::print' : unable to resolve function overload
error C2065: 'a' : undeclared identifier
error C2228: left of '.addhead' must have class/struct/union type
error C2228: left of '.addhead' must have class/struct/union type
error C2228: left of '.addhead' must have class/struct/union type
error C2228: left of '.print' must have class/struct/union type

Quote:

---

Originally Posted by phoenix2007

oh ! I'm sorry ! I've just remember !

Code:

---

void main(void)

---

just right in C, not in C++. If in C++, must write :

Code:

---


void main()

---

Is that ok ?

---

no no No NO NO!
That has never been valid C or C++.
Note that in this special case, even though it must be int main, you do not have to have a return statement.
Read the relevant part of this:
http://www.research.att.com/~bs/bs_faq2.html

You are missing your return type (which is void) on the function definitions that cause the errors.

aka

Code:

---

template <class T>
dslk<T>::addhead(T key)
{
        Node<T>* NEW;
        NEW = new Node<T>;
       
        NEW->data = key;
        NEW->link = head;
        head = NEW;
}

---

Should be:

Code:

---

template <class T>
void dslk<T>::addhead(T key)
{
        Node<T>* NEW;
        NEW = new Node<T>;
       
        NEW->data = key;
        NEW->link = head;
        head = NEW;
}

---