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No Linkage

If a declaration for an identifier within a block does not include the extern storage-class specifier, the identifier has no linkage and is unique to the function.

The following identifiers have no linkage:

  • An identifier declared to be anything other than an object or a function

  • An identifier declared to be a function parameter

  • A block-scope identifier for an object declared without the extern storage-class specifier

If an identifier has no linkage, declaring the same name again (in a declarator or type specifier) in the same scope level generates a symbol redefinition error.

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