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To establish where argument values are located in memory, you first create
a pointer using va_list, an acronym for
variable
argument list:
va_list argument_pointer;
Even though va_list is written with lower-case characters,
and there is no asterisk, va_list is a macro that declares
argument_pointer to be a pointer.
With argument_pointer declared, you provide an assignment using
another macro, va_start. The
va_start macro takes as its arguments both the function's argument
pointer and the function's final ordinary argument:
va_start (argument_pointer, argument_count);