C Library - <stdarg.h>

Quiz

The stdarg.h header defines a variable type va_list and three macros which can be used to get the arguments in a function when the number of arguments are not known i.e. variable number of arguments.

A function of variable arguments is defined with the ellipsis (,...) at the end of the parameter list.

Library Variables

Following is the variable type defined in the header stdarg.h −

Sr.No.	Variable & Description
1	va_list This is a type suitable for holding information needed by the three macros va_start(), va_arg() and va_end().

Library Macros

Following are the macros defined in the header stdarg.h −

Sr.No.	Macro & Description
1	void va_start(va_list ap, parmN) This macro enables access to variadic function arguments.
2	type va_arg(va_list ap, type) This macro retrieves the next argument in the parameter list of the function with type type.
3	void va_end(va_list ap) This macro allows to end traversal of the variadic function arguments.
4	void va_copy( va_list dest, va_list src ) This macro makes a copy of the variadic function arguments.

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