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How extern is used?

Sreenadh surendran

How extern can be used?

In which file the variable without extern to be declared?

Or there is no such restrictions?

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  • 0 in reply to Christoph Franck

    "Extern is used to access global variables/functions that have been declared in another module/file."

    Actually, the global variables/functions must be defined in another module/file - extern provides just a declaration.

    The definition is what actually creates the "object"; ie, allocates memory or generates code.
    Every "object" must have exactly one definition.

    A declaration simply provides information that an "object" is defined elsewhere.
    An "object" may have many declarations.

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  • 0 in reply to Christoph Franck

    "Extern is used to access global variables/functions that have been declared in another module/file."

    Actually, the global variables/functions must be defined in another module/file - extern provides just a declaration.

    The definition is what actually creates the "object"; ie, allocates memory or generates code.
    Every "object" must have exactly one definition.

    A declaration simply provides information that an "object" is defined elsewhere.
    An "object" may have many declarations.

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