Linker error. C++

Boston

I'm writing a particularly large project and decided to give linking a go. This being my first time using linking I've run into a brick wall with this error

[Linker error] undefined reference to `WinMain@16'

What does it mean and how do I fix it.

The interface file
[PHP]using namespace std;

#ifndef NODE_H
#define NODE_H

class Node{
public:
Node();
void data_asign(int);
int data_get();
void value_asign(int);
int value_get();
void next_asign(Node*);
Node* next_get();
Node* link[4]; //make this private

private:
int data;
int value;
Node* next;

};


#endif
[/PHP]


The implication file
[PHP]#include<iostream>
#include "node.h"
using namespace std;

Node::Node(){
next = 0;
data = 0;
for(int i = 0; i <4;i++){
link = NULL;
}
}

void Node::data_asign(int x){
data = x;

}


int Node::data_get(){

return data;
}

int Node::value_get(){

return value;
}

void Node::value_asign(int x){
value = x;

}

void Node::next_asign(Node* x){
next = x;
}

Node* Node::next_get(){

return next;
} [/PHP]


I'm also linking several other files and I get the same error with all of them

Boston

Apparently i have to add int main(){return 0;} to all my implimentation files, why?

Also the file that links to the class says linker error underfined reference, then lists every fuction in the .h file. What am I doing wrong

thanks

rsynnott

Boston wrote:

Apparently i have to add int main(){return 0;} to all my implimentation files, why?

Also the file that links to the class says linker error underfined reference, then lists every fuction in the .h file. What am I doing wrong

thanks

I'm assuming that you were compiling that class for use in a larger program, rather than as a standalone program? A main function is only required (or desirable) in a standalone program.

What compiler are you using, and with what commands? With GCC, to compile a module do:
g++ -c whatever.cpp

and to link it do:
g++ -o finalprogram whatever.o otherthing.o...

Note that since you're on Windows, the '.o' will be replaced with something else, I can't remember what. Only one of the modules being linked should contain a main.

Boston

I was using Dev - cpp. The problem didn't go away, it seems permenent. Not know the finer points of linking,(hasn't been covered in my course) I wasn't including the right header files with the right others files that required them. Once I sorted that out, everything was ok. But thanks for your help.