stl-huffman

用C语言完成欧拉计算，非常简单的一个小应用(Using C language to complete euler calculation)

说明：  这是一本非常实用的书籍,写明了成为DOS高手的捷径,不错的源码(This is a very practical book, written to become a DOS master shortcut, good source code)

1. 对信息进行填充，使其字节长度与448模512同余 2. 设置好4个链接变量，进入算法的4轮循环运算 3. 每轮一个非线性函数 F(x, y, z)  (((x) & (y)) | ((~x) & (z)))   G(x, y, z)  (((x) & (z)) | ((y) & (~z))) H(x, y, z)  ((x) ^ (y) ^ (z)) I(x, y, z)  ((y) ^ ((x) | (~z))) MD5轮主要操作: FF(a, b, c, d, x, s, ac) { (a) += F ((b), (c), (d)) + (x) + ac; (a) = ROTATE_LEFT ((a), (s)); (a) += (b); } GG(a, b, c, d, x, s, ac) { (a) += G ((b), (c), (d)) + (x) + ac; (a) = ROTATE_LEFT ((a), (s)); (a) += (b); } HH(a, b, c, d, x, s, ac) { (a) += H ((b), (c), (d)) + (x) + ac; (a) = ROTATE_LEFT ((a), (s)); (a) += (b); } II(a, b, c, d, x, s, ac) { (a) += I ((b), (c), (d)) + (x) + ac; (a) = ROTATE_LEFT ((a), (s)); (a) += (b); }

说明：  通过修改，注册表，实现修改默认打印机功能(it is used to modify the setting of the defualted printer )

说明：  通过编程使得STM32连接gy-39温度传感器，输出相关的气象数据(Through programming, STM32 is connected to gy-39 temperature sensor to output relevant meteorological data)

C#数据库编程（人力资源管理系统），自带数据库！用户可以通过该实例掌握C#的编程基础知识！(Database Programming C# (human resource management systems), bringing their database! The user can master the examples of C# programming knowledge base!)

DSmT证据推理的组合公式计算函数，小波包分析提取振动信号中的特征频率，多元数据分析的主分量分析投影。( Combination formula DSmT evidence reasoning calculation function, Wavelet packet analysis to extract vibration signal characteristic frequency, Principal component analysis of multivariate data analysis projection.)

说明：  单片机STM32103RCT6,GD32F103RCT6,程序管脚都兼容，采集16通道的ADC数据，通过FATFS文件管理系统将数据存储到SD卡。(Stm32103rct6 and gd32f103rct6 are single-chip computers. The program pins are compatible. The ADC data of 16 channels are collected and stored in SD card through FatFs file management system.)

C# Mp3播放器效果

说明：  实用C++计算一篇英文文本的信息熵 1、 读取文档，统计英文字母及空格出现的次数； (将小写字母转为大写字母进行计数) 2、 求概率分布P(X)； 3、 根据定义求信息熵。(Computing the information entropy of an English text with C + + 1. Read the document and count the number of English letters and spaces; (convert lowercase letters to uppercase letters for counting) 2. Calculate the probability distribution P (x); 3. According to the definition of entropy.)