编写一个函数saver（a,n），其中a是一维整型数组，n是a数组的长度，要求通过全局变量pave和nave将a数组中正数的平均值和负数的平均值传递给调用程序-Write a function saver (a, n), where a one-dimensional array of integers, n is the length of an array of a request by the global variable pave and nave will mean a array of Chiang Kai-shek and negative numbers mean passed to the calling program .