ISO C defines a syntax for declaring a function to take a variable
number or type of arguments. (Such functions are referred to as
varargs functions or variadic functions.) However, the
language itself provides no mechanism for such functions to access their
non-required arguments; instead, you use the variable arguments macros
defined in `stdarg.h'.
This section describes how to declare variadic functions, how to write
them, and how to call them properly.
Compatibility Note: Many older C dialects provide a similar,
but incompatible, mechanism for defining functions with variable numbers
of arguments, using `varargs.h'.
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