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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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