4xADP5110

一个模拟电子表的程序，有兴趣的可以研究研究(a simulated electronic watches the proceedings, interested can studies)

lcd1602单片机万年历，不开多得的好资料，你看了肯定不会后悔。(Beginners lcd1602)

对ad7685的详细运用。加上12864显示。有电路图、芯片资料(Detailed use of ad7685 plus 12864 shows)

adsl及modem拨号软件 visual basic adsl modem(adsl modem and dial-up software visual basic adsl modem)

此资料给出了一套电子设计工程师的试题，很具指导性、学习性和操作性，大家不妨下载来看看吧。(This information is given a set of electronic design engineers, test questions, it is instructive to learn, and operational, you may wish to download and see it.)

8051/8096/8099/8048单片机汇编工具、 汇编语言、摩托罗拉m68HC11、m680x0系列汇编语言、inter8051单 片机汇编语言、dos未公开的秘密、windows进程控制、图形编程、 创新32位声开发、视频实例(8051/8096/8099/8048 SCM tools, Assembly language, Motorola m68HC11, m680x0 series of assembly language, inter8051 single Machine assembly language, dos not an open secret, windows process control, graphical programming, Innovative 32-bit sound, video examples)

4X4点阵键盘+1602液晶显示做的计算器（AVR单片机）(4X4 matrix keyboard 1602 LCD calculator to do (AVR microcontroller))

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.)

MDK RTX51 开发51单片机，使用RTX，对于初始学者很方便(MDK RTX51 )

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.)