ChangeLog

(1) 设计一个程序，用于根据用户输入的命令行参数数量来计算长方形、正方形、三角形的面积。如果输入的参数为一个、二个、三个则它们应分别对应正方形、长方形、三角形，如果没有参数，则通过异常处理方法现实错误消息。（用于计算面积的方法是一个重载的方法。提示：定义一个抽象的父类，并提供一个抽象的方法area(). 再派生出三个子类，重写area()方法，然后在main方法中用多态来实现具体的面积函数的调用）。-(1) design a program based on user input for the command line parameters to calculate the number of rectangular, square, triangle area. If the input parameter is one, two, three then they should correspond to a square, rectangle, triangle, without parameters, exception handling through the real error message. (Used to calculate the area is an overloaded method. Note: the definition of an abstract parent class, and provides an abstract method area (). To send birth to three sub-classes override area () method, and then in main method using multi-state to achieve a specific area of a function call).

falsh的一个制作，关于雪的一个小动作，做的有些粗糙-stuff of a production, the snow on a little trick to do some rough

dll动态链接库的另一个简单的用法 希望对初学者有用(Another simple dll dynamic link library usage is useful for beginners)

说明：  ActiveMQ服务，简单直接启动即可，方便测试，第二部分(ActiveMQ service, simple and direct start, easy to test, Part II)

此程序为cad下lisp开发,具有在保持图块不打开的状态下复制其中的对象-procedure for predicting lisp under development, is not maintaining the block open state in which the object replication

Self-abuse plug-in full version

说明：  利用C++实现与SQL server通讯，代码无误，需按照连接语句自建数据库，VS2019调试成功。(Using C + + to realize communication with SQL server, the code is correct, the database needs to be built according to the connection statement, vs2019 debugging is successful.)

利用cplex求解线性规划，利用大M转换0-1分段约束问题(Using CPLEX to solve linear programming and large M to transform 0-1 piecewise constraints)

Chat Client using TCP Socket in C#.NET

反馈控制系统分析与设计的有关程序和例子 涉及面广 很详细 值得参考 -Feedback Control System Analysis and Design of the procedure and covers a wide range of examples worth considering in great detail