Need help

Question

im using code:block

at pages.
//f.cpp file
#include<iostream>
int count;
extern void write_extern();
int main()
{
count =5;
write_extern();
return (0);
}
error:1.undefined reference write_extern()
2.id retuened 1 exit status.
//f1.cpp
#include<iostream>
extern int count;
using namespace std;
void write_extern(void)
{
cout<<"cout is:"<<cout<<endl;
}
error:1.undefined count
2.id returned 1 exit status
3.undefined WinMain@l6

i tried to fix with adding #include"f1.cpp" right at the bottom of <iostream> in f.cpp file. f.cpp running n output is 5.
then, at file f1.cpp i do the same with adding #include"f.cpp" n not compiling cos it has many error. like keep going to list. i back to my f.cpp file n its still can be compiled n running.
how to run both file? thank you so much in advance

Answer 1

Hi, Upar!
From the beginning.
1. f.cpp : extern must be deleted ( because prototype is sufficiently),
2. f1.cpp : "cout is:" << count ?(not cout)

Answer 2

Not understand you answer. Did you deleted extern?
More.
1. f.cpp : Add, to define count with initialization (e.g. 0) together.
2. Avoid #include "f1.cpp".

Answer 3

Excuse me! The night was.
Continue.
I saw the link. By the way, int foo() and void foo() - different therein !
So.
1. f.cpp: extern(line 3) - delete!
2. f1.cpp: must be - void write_extern()...//empty brackets

Answer 4

1. i deleted n try to compile it then it shows error.
2. fixed.

Answer 5

//f.cpp
1.#include<iostream>
2.int count = 0;
3. extern void write_extern();

4.int main(){
5.count=5;
6.write_extern();
7.return (0);
8.}
3 errors. 1.undefined count. 2.undefined to winMain@16. 3.id returned 1 exit status.

//f1.cpp
1.#include<iostream>
2.extern int count;
3.using namespace std;
4.void write_extern(void){
5.cout<<"Count is:"<<count<<endl;
6.}

3 errors. 1. undefined count 2. undefined WinMain@16. 3. id returned 1 exit status.

Answer 6

sorry at f.cpp has 3 errors which 1. undefined write_extern() instead of undefined count.

Answer 7

https://www.daniweb.com/programming/software-development/threads/131659/how-exactly-to-use-extern
it has the same like my pages coding too n not working.

Answer 8

ill try at night when i get home n ik the diff between int foo() and void foo() bout their type of return n btw thanks for ur help ill b glad if u dont mind till those files running.