Topic       : C-Language Documentation
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View Ref-File[ Function Prototyping ]

... enables the compiler to perform type checking and conversion for
function calls.  Also, without prototypes functions have to be defined
before they can be called, forcing a "bottom up" programming style.

Prototypes are generally stored in header files (see #include).
The storage class for prototypes is extern.

Prototypes will not interfere with a subsequent function definition
(so long as the types agree).

The syntax is essentially the same as the ANSI Definition, except
that the {<local block>} is replaced with a semicolon and the argument
names are optional.

  [<type>] [<parm>] <name> (
    <type> [<arg name>],
    <type> [<arg name>],
    ...) ;

Examples:

  float trace(int n, float a[N][N]);
  void signal_handler(int);