定义了一个整型数组类Array，数组长度为30个元素。数组的初始化数据来源以及程序结束后数组的数据保存都指向工程文件夹下的文本文件

"vdata.txt"。即，创建数组对象时，在构造函数中读该取文件获得数据（首次创建对象时文件是打不开的，数组就没有初始化值），当程序结束时，

析构函数将数据写入上述文件。-Defines an integer array class Array, the array length of 30 elements. Initialization of the array after the end of data sources and process the data stored point array project folder text file " vdata.txt" . That is, create an array object, the constructor of the access file for read data (for the first time when the file is not open to create an object, the array is not initialized to value), when the program ends, the destructor writes the data into the document.