Introduction to C Variadics The C language provides a special class of functions called variadic functions that can be called with a variable number of arguments. The declaration of a variadic function ends with an ellipsis, e.g.: void variadic_function(int x, ...); Variadic functions can be called with any number of arguments in place of the ellipsis (including none at all). The C runtime provides a set of helper macros that developers use to retrieve the values of the variadic arguments.
