由于数组的元素个数默认情况下是不作为实参内容传入调用函数的，本程序用来讨论有此带来的相关问题，以及解决问题方法，即给调用函数传递数组的元素个数的几种有效方法并实现它 -As the number of elements of the array by default, it is not passed as an argument the contents of the function is called, this program is used to discuss issues related to have this brought about, as well as problem-solving method, that is, to call the function passing the number of elements of the array Several effective methods and to achieve it