473,325 Members | 2,480 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,325 software developers and data experts.

extern

who will extern work? what is the different between header file and calling
extern?
Sep 18 '06 #1
1 3359
Banfa
9,065 Expert Mod 8TB
The extern keyword declares any declarator (function or variable) with external linkage.

A header file is a file containing a series of C/C++ statements that you may wish to include into 1 or more source files.
Sep 18 '06 #2

Sign in to post your reply or Sign up for a free account.

Similar topics

2
by: ik | last post by:
Hello all, Under C++ when 'extern' is used with out the string literal "C" does it act the same as a 'static' ? When is it appropriate using 'extern' ? Thanks ~Ik
4
by: John Ratliff | last post by:
I have a few global variables in my app. They are defined in the main application class file and declared (extern) in a header which can be included by anyone who would want to use these variables....
10
by: Mark A. Gibbs | last post by:
I have a question about mixing C and C++. In a C++ translation unit, I want to define a function with internal linkage and C calling convention. Here's a sample of what I want to do: //...
18
by: tweak | last post by:
What's the best way to use extern when using multiplefiles that is easiest to maintain? Is it best to declare: extern int a; in a header file and include the header file in all files except...
12
by: G Patel | last post by:
I've seen some code with extern modifiers in front of variables declared inside blocks. Are these purely definitions (no definition) or are they definitions with static duration but external...
19
by: ccwork | last post by:
Hi all, I am reading "C: A Reference Manual" 4th ed and I get lost for the "extern". It says that global object without specifying the storage-class specifier will have "extern" as the default...
5
by: siliconwafer | last post by:
Hi all, I wanted to know that is use of extern keyword mandatory in case of global variables and functions used in other source files? i.e consider a following piece of code from MSDN explaining...
17
by: Tapeesh | last post by:
I would like to know what is the expected behaviour of C compilers when an extern decleration is intialized. When the following code is compiled using gcc //File extern.c int arr ; int a ;
5
by: Christian Christmann | last post by:
Hi, I've tree questions on the storage class specifier "extern": 1) Code example: int main( void ) { int b = -2; // my line 3 if ( a ) {
4
by: mimi | last post by:
The programmer indicates to the compiler that a function is written in a different programming language using a linkage directives.It is intuitive that extern "SomeLanguage" is used to declare...
0
by: DolphinDB | last post by:
Tired of spending countless mintues downsampling your data? Look no further! In this article, you’ll learn how to efficiently downsample 6.48 billion high-frequency records to 61 million...
0
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
1
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
0
by: Vimpel783 | last post by:
Hello! Guys, I found this code on the Internet, but I need to modify it a little. It works well, the problem is this: Data is sent from only one cell, in this case B5, but it is necessary that data...
0
by: jfyes | last post by:
As a hardware engineer, after seeing that CEIWEI recently released a new tool for Modbus RTU Over TCP/UDP filtering and monitoring, I actively went to its official website to take a look. It turned...
1
by: Defcon1945 | last post by:
I'm trying to learn Python using Pycharm but import shutil doesn't work
1
by: Shællîpôpï 09 | last post by:
If u are using a keypad phone, how do u turn on JavaScript, to access features like WhatsApp, Facebook, Instagram....
0
by: Faith0G | last post by:
I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...
0
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 3 Apr 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome former...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.