读RENIX格式的导航电文以及观测文件，实现标准单点定位

书后练习作业，一个文件自动备份器，根据所设定的日期自动将备份路径所指文件备份至目标路径(Automatic File Backup Device)

说明：  做Web服务器编程，使用xml作为变量，网上整理的操作xml(Operation XML of online reorganization)

电力行业上层协议，用于RT-thread操作系统。

Test code for TFT 3.5 LCD touchscreen for Arduino UNO

经典的0-1背包问题，程序可以自动输入并且有注释(Classical 0-1 knapsack problem, the program can automatically entered and annotated)

本人亲测可运行

三维物体模型显示程序设计 利用C语言及OpenGL语言读取OBJ文件，显示三维物体模型 (Three-dimensional object model display program design the use of C language and OpenGL language OBJ read documents to show the three-dimensional object model )

DES( Data Encryption Standard)算法，于1977年得到美国政府的正式许可，是一种用56位密钥来加密64位数据的方法。虽然56位密钥的DES算法已经风光不在,而且常有用Des加密的明文被破译的报道,但是了解一下昔日美国的标准加密算法总是有益的,而且目前DES算法得到了广泛的应用,在某些场合,她仍然发挥着余热.（如：UNIX的密码算法就是以DES算法为基础的）。将其修改为三重DES也能抵抗破解。下面是关于如何实现DES算法的语言性描述：(DES ( Data Encryption Standard ) algorithm, in 1977 the U.S. government s official permission , is a 56 -bit key to encrypt 64 data . 56 keys of the DES algorithm scenery is not , and often with Des encryption expressly decipher reported , but look at the old standard encryption algorithm is always useful , but the DES algorithm has been widely used in a some occasions , she still plays a waste heat . (such as : UNIX password algorithm is DES algorithm -based ) . To modify the Triple DES is also resistant to cracking . The following is a description language on how to achieve the DES algorithm : )

一卡一车，停车刷卡闸门打开，开始自动计时计费；取车刷卡闸门打开，自动统计停车时间及所需缴纳的费用。(A card for a car, parking gates open credit card, start the automatic time billing take the car to open the gate card, automatic statistics downtime and required to pay costs.)

利用matlab模拟光纤中EH11模的模式分布图。(Using matlab simulation mode fiber EH11 mode maps.)