key11_11

这是基于单片机的计算器程序，可以实现加减乘除的功能(This is based on single-chip calculator program, Math functions can be achieved)

OS_II移植到单片机,网上都是大模式移植,这是我在网站上找到的小模式移植,不知道有用吗?(OS_II transplanted into single-chip, on-line model of graft are large, this is my website found in the small model of transplantation, I do not know useful?)

说明：  usb控制下位机led 灯的点亮,哦2混排博大精深进 .(jhsofgj k skdfgmdkf m k pkd fkgfpok fgk dpo )

智能小车寻黑线测试程序，经典资料！电子设计大赛 小车(Smart car found black line test program, the classic material! )

仿真讯鸟的坐席服务器的软件。在没有CTI的工作环境下，也可以适合作呼叫中心坐席软电话开发(simulation appear birds dine server software. CTI in the absence of the working environment, they can be suitable for call center soft phone development Seat)

AD转换资料，超全大量AD采集电压以及采集电流的方法！(AD conversion data, a large number of ultra-wide voltage and collected current AD acquisition method!)

电子时钟程序，简洁明了，原创请勿抄袭 适用于stc15单片机(Electronic clock program)

电子时钟的小程序，基于89c51单片机，可以实现定时、计时、修改时间等功能。(Electronic clock applet, based on 89c51 microcontroller, can achieve timing, timing, modification time and other functions.)

边界盒的检测，能有效的知道边界盒的最大长度，为编程带来方便(Bounding box test, which can effectively know the maximum length of the boundary box for programming convenience)

说明：  下面的程序利用友元函数求两点间的距离。请你将有关的程序补充完整，并总结为什么这里要用友元函数来求两点间的距离。(using friend to get the result.)