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Where	Storage	Initial	Storage	Scope/Linkage	Visibility
specified	class	value	allocation
1. Dating clared	(none)	Yes	Yes	Block scope,	Withinsame blo, including all
in block	auto	No	Yes	no lii nkage	nested blocks, except
	register				any nested block (and its
	static				nested blocks) with an identical identifier without extern
2. Declared	extern	No	CASE A: Enclosing scope has identical, visible
in block			identifier - same scope, linkage, allocation, visibility as the matching identifier
			CASE B: Otherwise, same as if declared extern outside function (see 7, below)
3. Declared	extern	Yes	ILLEGAL
in block			declaration
4. Not declared but referenced in block			CASE A: Enclosing scope has identical, visible identifier declared in the same source file prior to the reference - same as if declared extern in block (see 2, above)
			CASE B: Otherwise, ILLEGAL declaration

Feeling a Little C-sick?

C syntax flies in the face of the "say what you mean, mean what you say" principle of programming. The keyword extern is simply an abbreviation for "external" - a word you'd expect to be related to visibility or scope and to mean something like "outside the current context." And you'd expect the other relevant keyword, static, to relate to how storage is managed. Thus, you might read the declaration

 extern int x;

to mean the variable x is visible outside the block or file in which it's declared. Likewise, for a declaration without extern (C has no intern keyword), such as

 int x;

you'd expect the variable x not to be visible outside the block or file in which it's declared. For variables declared within a function or nested block, this sensible interpretation holds. The problem arises for variables declared outside any function. (In C, such declarations are called external declarations.) In most cases, when the two previous examples appear as external declarations, both the extern and non-extern declarations mean the variable is visible outside the file in which it's declared. (If the extern declaration isn't the first declaration of x, however, and the first declaration of x isn't visible outside the file, the extern declaration also specifies that x isn't visible outside the file - a further complexity in C's approach to visibility.) Some programmers wise in the ways of C might argue, "But both declarations are external declarations, so it is consistent that they both are visible `externally' to the file." Nice try. However, when the declaration

 static int x;

is outside any function, it also is an external declaration, yet it defines a variable that is not visible outside the file.

Not only does C's syntax lack consistency, but it also confuses things by using the static storage class keyword to specify visibility. My theory is that Humpty Dumpty was on the original C design team. As he told Alice, "When I use a word, it means just what I choose it to mean - neither more nor less."

There are other confusing cases, as in the second declaration of x below,

 static int x;
 main( void ) {}

where the use of extern results in internal qExpensive Naked Cheapporn Dating Tips Sexy C - Advice And Porn Warnings For C - Simplified Variae Declarations Tutorials Expensive Naked Cheapporn Dating Tips Sexyf Girls Men eExpensive Naked Cheapporn Dating Tips Sexy C - Advice And Porn Warnings For C - Simplified Variae Declarations Tutorials Expensive Naked Cheapporn Dating Tips Sexyk Russian