Thread: declaration problem.

I have two files main.cpp and T.cpp

T.cpp cosists following

#include <iostream.h>

class TEXT{
public:
void g(void){
cout<<"Hello World!";
}
};


and main.cpp

#include <iostream.h>

TEXT text; // I think that is mistake

int main(void){
text.g();
return 0;
}

Why dosn't this program work? I have used
extern TEXT text;
But this doasn`t work also.

What is the problem.

NO I don`t want to do header file.
I know that it must work somehow.

This is exactly what I want to know,
how the compiler know what is TEXT.
When the TEXT is functoin I can use it when I write exter void TEXT(void);
to the main.cpp fail.
Why doasn`t this work with class?

Yes it work when I include T.cpp as header file. It add this header file to the beginning of the main.cpp. But I want to compile these two files separatly.

It doasn`t matter when the program is small just with few classis, but it is very useful when the program get bigger.

sorry when something is unclear for you my english isn`t very good.

no I haven`t to include T.cpp

this is how it works when TEXT is function

//T.cpp

#include <iostream.h>

void TEXT (void){
cout<<"Hello World!";
}

//main.cpp

#include <iostream.h>

extern void TEXT(void); // this is how it worj with function

int main(void){
TEXT();
return 0;
}

But when there are TEXT class how it work then?

>"I want to code in a language, and i'm not following the rules of the language's structure and compilation process... WHY DOESN'T IT WORK??"

Because he's 'learning'. You know, that thing you did when you had no knowledge of programming. So far all I've seen you do is insult people for lack of experience and I find it revolting. If all you can do is flame, then go hang out on an IRC chat room and leave these boards to those who want to learn and those who want to help.

>geeez.. i swear i've had my fill of people like you.

Then do us all a favor and leave.

>But when there are TEXT class how it work then?

When you've externed the function you've given a declaration. As has already been pointed out this would normally be in a header file, but if you really want to do it without a header then something like this might work -

T.cpp -

Code:

#include <iostream.h>

class TEXT{ 
	public: 
		void g(void);
}; 

void TEXT::g(void){cout<<"Hello World!";} 

TEXT text;

main.cpp -

Code:

#include <iostream.h> 

extern class TEXT{
public: 
void g(void);
}text;


int main(void){ 

	text.g(); 
	return 0; 
}