-
A procedure definition contains the statements in the
body of the procedure, the procedure is actually created
A variable definition allocates memory to store the
variable value, the variable is actually created
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A variable or procedure that is declared extern is not
defined in the current file, its definition is in another file
that will be loaded with the current file
-
A procedure is visible outside of the current file by
default, that is you can call a procedure defined in another
file
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If a procedure is not declared in the current file, but is
called by a procedure in the current file, C will provide a
default declaration for the procedure, by default it
returns an integer value
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If a procedure is declared static, then its definition
cannot be seen outside of the current file, a static
procedure can only be called by the procedures that are
defined in the current file - it is not seen outside of this
file
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