Initialize the variable-length argument list.

This function is compatible with the following targets:

ANSI

BeOS

EMB/RTOS

Mac OS

Palm OS

Win32

#include <stdarg.h>

void va_start(va_list ap, ParmN Parm);

Parameters for this facility are:

ap	va_list	A variable list
Parm	ParmN	The last named parameter

The va_start() macro initializes and assigns the argument list to ap. The ParmN parameter is the last named parameter before the ellipsis (...) in the function prototype.

"va_arg"

"va_end"

#include <stdarg.h>
#include <string.h>
#include <stdio.h>

void multisum(int *dest, ...);

int main(void)
{
	int all;

	all = 0;
	multisum(&all, 13, 1, 18, 3, 0);
	printf("%d\n", all); 	

	return 0;
}

void multisum(int *dest, ...)
{
	va_list ap;
	int n, sum = 0;
	
	va_start(ap, dest);
	
	while ((n = va_arg(ap, int)) != 0)
		sum += n;	 /* add next argument to dest */
	*dest = sum;
	va_end(ap);	 /* clean things up before leaving */
}
 Output:
3


 





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Last updated: August 16, 2000