本程序实现将十进制转换成二进制，并可进行简单的加减乘除四则运算和二进制的与或运算，这是修改部分BUG后源码。经初步测试，算法没有问题。-Program to convert decimal to binary, can be a simple addition, subtraction, multiplication and division four operations and binary OR operation, which is to modify some of the BUG a

标准DES算法，控制台操作可对任意文件进行加解密，没有错误和BUG，代码都写有注释。使用C-Free，VS或VC++都可以进行编译。-Standard DES algorithm, console operator can encrypt and decrypt any file, no error and BUG, ​ ​ code written comments.