Web Reference: Mar 7, 2025 · In C, variadic functions are functions that can take a variable number of arguments. This feature is useful when the number of arguments for a function is unknown. It takes one fixed argument and then any number of arguments can be passed. Let's take a look at an example: They are also simply called functions with variable argument lists. Another way of saying this is that they are functions of indefinite arity. A key example in C is printf(), which takes a single format string, but then an arbitrary number of value arguments: int printf(const char *format, ...); The most frequently used library functions in C, i.e., printf () and scanf () are in fact the best-known examples of variadic functions, as we can put a variable number of arguments after the format specifier string.
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