What's the best way to declare and define global variables

gunturi.prabhakar

 Profile Answers by gunturi.prabhakar 

• May 30th, 2008

 

use extern storage class with that variable...
it can only make that as an external variable

rimi.mnnit

 Profile Answers by rimi.mnnit 

• May 30th, 2008

 

If a program is in several source files,the best arrangement is to place each definition 
in some relevant source(.c) file, with an external declaration of function n variables in
 a seperate header file that is included by #include at the front of each source file..

rks_147

 Profile Answers by rks_147 

• Jun 20th, 2008

 

Best Way to represent a variable as global is , Just define the variable at the initial or just below the headers files


                   For Example:-
                                           #include<stdio.h>
                                           #include<conio.h>
                                           #define PIE 3.1415
                                          
                                           void main()
                                            {
                                                   body of program      
                                                                                                
                                            }
                                            getch()

where PIE is define globally.

kbjarnason

 Profile Answers by kbjarnason 

• Jul 1st, 2010

 

The best way to declare and define global variables is to fix your code so you're not using them.

The second best way is to determine whether you mean "file scope" - "global" but only within the given source unit - or actual global, visible to everything.

If it's file scope you're after, define the variable as a static, outside the confines of any function block.

If it's truly a global, declare it in a header as an external, then define it once in a single source module.  Include the header in any source module which requires access to the variable.