要求用户输入一字符串，程序检查字符串中的“a”的个数，报告给用户”你输入的字符串中有？个a...

很好的一套指纹识别系统C源码，包括了指纹指别的各种算法及指纹识别的实现方法。(Very good set of fingerprint identification system C source code, including a variety of other means of fingerprint fingerprint recognition algorithm and the realization method.)

C++实现的M95M02 SPI FLASH芯片的操作封装，能够很好的用到自己的程序中，无需修改(C++ M95M02 SPI FLASH chip operation package, can be very good use of their own procedures, without modification)

基于单片机的数控开关电源设计，带仿真和详细程序。(NC-based single-chip switching power supply design, with simulation and detailed procedures.)

一个基于C++的打虫子游戏，难度递增，虫子的轨迹随机。(A C++ to play insect games, difficulty increase.)

说明：  circular queue in c with linked list

实现屏幕上显示自定义形状 并实现了对形状内部填充色及边框的颜色处理 实现了 图形的移动 并对其边界进行限制(Realize the screen to customize the shape and realize the shape of the internal fill color and border color to achieve a deal with the movement of graphics and border restrictions)

用C语言实现空间大地直角坐标和大地坐标之间的相互转换(C language is used to realize the transformation between rectangular coordinates and geodetic coordinates.)

Windows进程的创建与销毁 Windows process creation and destruction(Windows process creation and destruction)

说明：  LT8619C_LT8618EXB_EVB_HDMI_Converter_20180914_N76E003_PLL_setting_2_Beta

机械设计Matlab实现,如连杆机构的结构设计，槽轮机构的机构设计(Mechanical design and Matlab implementation, such as the linkage structure of grooved wheel mechanism design, mechanism design)