设计一个用于管理朋友信息的程序。将朋友信息（年龄、姓名、电话）存放在MyFrd.dat中，从文件读出这些信息并显示，并能按姓名(要求可简化输入，如只输入姓氏便可查询)进行查询，将查询信息输出屏幕。-Designed to manage a friend to information. The friend information (age, name, phone) stored in MyFrd.dat, the information read from the file and displays, and according to Name (required simplify input, such as you can only enter the last name query) query, the query information output screen.