How Variadic Functions are Defined and Used

Defining and using a variadic function involves three steps:

• Define the function as variadic, using an ellipsis (`...') in the argument list, and using special macros to access the variable arguments. See section Receiving the Argument Values.
• Declare the function as variadic, using a prototype with an ellipsis (`...'), in all the files which call it. See section Syntax for Variable Arguments.
• Call the function by writing the fixed arguments followed by the additional variable arguments. See section Calling Variadic Functions.

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