The difference between global and extern variables are very subtle. To
understand the clear meaning one needs to understand the terms like
"Linkage", storage classes etc.
By default the names of variables are made visible to the linker(
External Linkage). If the name has to be restricted to a particular
translational unit, then we have to prefix the declaration with
static(Internal Linkage).
int i; // This is the definition of a global variable with external
linkage.It is defined in the current Translational unit, so you can
say internal definition.
static int i; // Internal definition, internal linkage.
extern int i; // External definition, external linkage.
const int i = 5;// Internal Linkage
extern const int i = 5;// External Linkage
A name with internal linkage must also have internal definition( be
defined in the same translational unit where it is declared ).
Bijesh
-----Original Message-----
From: deo sharma [mailto:[EMAIL PROTECTED]
Sent: Monday, December 27, 2004 9:31 AM
To: [EMAIL PROTECTED]
Subject: RE: (PT) Diff b/w global & external variable's??
can youn please explain where exactly is memory allocated for the
external variables.is it allocated where it has been stored or it is
where it has been used.moreover to use external variables you use extern
statements and not #include statements.
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