average2.c

C和指针非常好的一本书.里面的有许多代码可以借鉴.

/*
** Compute the average of the specified number of values.
*/

#include <stdarg.h>

float
average( int n_values, ... )
{
	va_list	var_arg;
	int	count;
	float	sum = 0;

	/*
	** Prepare to access the variable arguments.
	*/
	va_start( var_arg, n_values );

	/*
	** Add the values from the variable argument list.
	*/
	for( count = 0; count < n_values; count += 1 ){
		sum += va_arg( var_arg, int );
	}

	/*
	** Done processing variable arguments.
	*/
	va_end( var_arg );

	return sum / n_values;
}