这是一个桌面时钟的小程序，本人刚学了vb.net，程序有什么不好的地方，敬请提出...

一:需求分析 1．本程序需掌握树和二叉树的概念及工作原理，运用其原理及概念完成实验.。 2．问题描述： 一个逻辑表达式如果对于其变元的任一种取值都为真，则称为重言式；反之，如果对于其变元的任一种取值都为假，则称为矛盾式；然而，更多的情况下，既非重言式，也非矛盾式。试写一程序，通过真值表判断一个逻辑表达式属于那一类。 3．基本要求： （1）逻辑表达式从终端输入，长度不超过一行。逻辑运算符包括“|”，“&”和“~”, 分别表示或、与和非，运算优先程度递增，但可以有括号改变，即括号内的运算优先。逻辑变元为大写字母。表达式中任何地方都可以含有多个空格符。 （2）若是重言式或矛盾式，可以只“显示True forever”或“False forever”，否则显示“Satisfactible”以及变量名序列，与用户交互。若用户对表达式中变元取一组值，程序就求出并显示逻辑表达式的值。 -1 : a needs analysis. The process required the trees and the binary tree master the concept and principle, to use its principles and the concept of completion of the pilot. . 2. Problem description : If a logical expression for the changes in the yuan"s value for a true, as tautology; Instead, If the changes for the yuan"s value for a fake, then called the contradiction; However, the more the situation, neither tautology. is not a contradiction. Try to write a procedure for the adoption of a truth table judgment logical expression belong into that category. 3. Basic requiremen

RA控制分拣系统的另一个源代码实现：），可以在该公司的RSLogix5000软件下运行-RA control of the sorting system to achieve another source :) in the company"s software running RSLogix5000

初始化一个顺序栈，编制实现入栈一个元素和出栈一个元素的程序。-an initialization sequence stack, drawing up a stack elements and elements of a stack up procedures.

双重效果的Label控件,希望给站长可以给我号开通下载-double effect of Label controls, hoping to head, I can be opened to download! !

It is about finidng the real and reactive power given some harmonics in the system.

vc游戏编程，有简单的，有复杂的。可以作为vc初学者的学习资料，也可以作为编程者的参考资料。-vc game programming, has simple, has a complex one. Vc beginners can be used as learning materials, but also can serve as a reference for programmers.

一款简单的计算器，希望大家多提意见-one simple calculator, we hope to speak up

MFC入门小程序源代码-MFC source code

WaitForSingleObject和WaitForMultipleObjects使用详解-Detailed use WaitForSingleObject and WaitForMultipleObjects

几种常见的伪随机数的产生程序，上载程序是从别处下载的，觉得还比较有用-several common pseudo-random number generated procedures, procedures are available on the download elsewhere, I felt that more useful