Variable Argument Lists

The printf family of functions is defined to accept a variable number of arguments, rather than a fixed argument list. You can define your own functions with a variable argument list, by using macro definitions from either stdarg.h' (for compatibility with ANSI C) or from varargs.h’ (for compatibility with a popular convention prior to ANSI C).

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Authoritative source: BUSMASTER DITA help source variable_argument_lists.dita, compiled into BUSMASTER.CHM with the application.