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Robert Seacord

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C/C++ language variadic functions are functions that accept a variable number of arguments. Variadic functions are implemented using either the ANSI C stdarg approach or, historically, the UNIX System V vararg approach. Both approaches require that the contract between the developer and user of the variadic function not be violated by the user. Many of the formatted I/O functions in the ISO/IEC 9899:1999 C language standard (C99) such as printf() and scanf() are defined as variadic functions (including formatted output functions that operate on a multibyte characters [e.g., ASCII] and wide characters [e.g., UNICODE]). These functions accept a fixed format string argument that specifies, among other things, the number and type of arguments that are expected. If the conte... (more)