struct question

[jammas615]

Hi guys,
I have a struct defined in a header, is it possible to use the same struct variable across more than one file. in other words like this....

header.h

struct box
{
    int length;
    int width;
}

file1.cpp

box.abox

file2.cpp

box.abox

[bluecoder]

yes you can by putting extern keyword ....

[jammas615]

in each file i use it in? or just in the header?

[bluecoder]

in the file where you are using the box .

[jammas615]

when i put an extern keyword in front of each variable definition it get an unresolved symbols error

[bluecoder]

can you post your code

[rahulroot]

header.h should include the struct definition.
struct box {
int length;
int width;
};

in file1.c
#include "header.h"

struct box abox; /* abox is variable of type struct box*/

do whatever you can do with that.

in file2.c
#include "header.h" /* verify it do we really need it here */
extern struct box abox;

use abox here

i hope this will solve your problem.
Regards

[filipe]

In C++ you don't need to say struct box abox; to instantiate a struct or class. They behave just like built-in data types, so you should just say box abox; instead.

[jammas615]

ok ive got a betrer idea now, i had already used a struct in another program that had the struct in a header and the variable in the file, my main question was about
using 2 files but thanks for your replies