Describe about storage allocation and scope of global, extern, static, local and register variables?
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Answer:
Globals have application-scope. They are available in any compilation unit that includes an
appropriate declaration (usually brought from a header file). They're stored wherever the linker
puts them, usually a place called the BSS segment.
Extern: This is essentially "global".
Static: Stored the same place as globals, typically, but only available to the compilation unit that
contains them. If they are block-scope global, only available within that block and its subblocks.
Local: Stored on the stack, typically. Only available in that block and its subblocks.
(Although pointers to locals can be passed to functions invoked from within a scope where that
local is valid.)
Register: See tirade above on "local" vs. "register". The only difference is that the C compiler will not let you take the address of something you've declared as "register".
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