Am 30.03.2023 um 21:32 schrieb Paul Gilmartin:
Does C use the CALL VL convention?
C has a portable solution for functions with a varying number of
parameters,
that is the mechanism defined in the ANSI header <stdarg.h>
Most interesting, these sort of functions - like printf() and scanf() -
need to have a certain count of fixed parameters, which by there form
and content
define the varying number of parameters which follow.
There is no need AND NO POSSIBILITY (on the mainframe, at least) to mark
the last parameter
in a certain way. And: the language definition doesn't say anything
about an end mark of
the parameter list; it only tells that the first (fixed) parameters must
tell the function
how much parameters follow.
See printf as the best known example.
Other (simpler) functions may simply require the number of parameters as
first parameter,
for example:
look_for_maximum (5, "John", "Fred", "Jim", "Henry", "Mike");
where 5 is number of strings, which follow.
HTH, kind regards
Bernd
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