说明：   作品名称：数字密码加密程序（三次改进版）作品目的：增加对条件指令、循环指令的了解并熟悉自定义函数、调用函数的方法以及文件处理指令作品功能：实现注册验证及对数字进行加密、解密功能,作品改进：利用软件爆破原理改进了程序输入正确序列号重启后仍需再次输入序列号的缺陷作品缺陷：程序判断用户的选择只能用数字否则出错(尝试用过char类型)，只能加密9位数字否则不能正确解密(此BUG与算法无关)，无论注册码是否正确重启程序后需再次输入序列号.以上原因尚不明确！⊙﹏⊙b汗.希望各位能多多指教
(Title: Digital password encryption program (three improved version) works Objective: To increase the conditional instructions, the loop instruction and become familiar with self-defined function, call function method and document processing instructions work function: to achieve up authentication and digital encryption, decryption function, works to improve: using software to improve blasting principle enter the correct serial number of the program still need to restart again after the serial number of the defective works flaw: the choice of procedure can only be used to determine the user or an error number (try to used the char type), only 9 digits can encrypt or decrypt is not correct (this BUG has nothing to do with the algorithm), regardless of whether the correct registration code need to restart the procedure again, enter the serial number. For the above reasons is not clear! ⊙ ﹏ ⊙ b Khan. Hope you will exhibitions )