Topic       : C-Language Documentation
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View Ref-File[ Functions ]

Functions break the work of the program into smaller (hopefully
reusable) segments.  The values of the parameters are passed to the
function and a single value is returned.  Any changes to the
parameters inside the function will not affect the calling routine.

Execution returns to the calling routine using the return
statement.  Void functions can use 'return;' or 'return(void);',
or use the implied return at the end of the local block }.

Additional information can be returned by passing the addresses of the
variables to be changed, or by using global or static variables.
Parameters of the form 'array[]' and '*array' are equivalent.

  ANSI Definition
  K&R Definition
  Prototyping
  Calling
  main
  Variable Argument Lists
  Function Pointers
  Parameter Passing

Note: functions can even call themselves, creating a new set of local
      variables on the stack.