C编写的数独游戏，从dat.txt中读取9X9的数独矩阵，即可给出数独结果

quiz software is a c++ project code of qiz contest Q.DAT --> Questions Database file HISCORE.DAT --> High scorer s file USER.DAT --> Stores user id s ans passwords-quiz software is a c++ project code of qiz contest Q.DAT--> Ques

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 displ