用可变参数求平均值

#include <stdio.h>
#include <stdarg.h>
float average(int val, ...)
{
	va_list   a;   //定义可变参数
	int count;
	float sum = 0;
	va_start(a, val);	//准备访问可变参数

	for (count = 0; count < val; count++)//添加可变参数列表中的值参数	

        {
		sum += va_arg(a, int);
	}
	va_end(a);//完成处理可变参数
	return sum / val;

}

<pre class="cpp" name="code" snippet_file_name="blog_20150404_1_9148109" code_snippet_id="636153">int main()

{

printf("%f\n",average(4,2,3,5,6,7));

return 0;}

}

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