【正文】 對(duì)于任意給定的問(wèn)題，設(shè)計(jì)出復(fù)雜性盡可能低的算法是在設(shè)計(jì)算法時(shí)考慮的一個(gè)重要目標(biāo)。一個(gè)算法總是在執(zhí)行了有窮步的運(yùn)算后終止，即該算法是可達(dá)的。算法分析是對(duì)一個(gè)算法需要多少計(jì)算時(shí)間和存儲(chǔ)空間作定量的分析。算法和程序之間存在密切的關(guān)系。 ●使用數(shù)據(jù)庫(kù)控制項(xiàng)和綁定控制項(xiàng) ●使用數(shù)據(jù)庫(kù)對(duì)象變量進(jìn)行編程 ●直接調(diào)用 在使用 VB 進(jìn)行數(shù)據(jù)庫(kù)編程時(shí) ,通常 ,會(huì)首先選擇三種基本方法之一來(lái)進(jìn)行數(shù)據(jù)庫(kù)應(yīng)用程序的方案設(shè)計(jì) , 現(xiàn)在就將以上三種設(shè)計(jì)方法的適應(yīng)范圍及其優(yōu)缺點(diǎn)進(jìn)行一個(gè)比較。 2．設(shè)計(jì)界面上各個(gè)對(duì)象的屬性 根據(jù)規(guī)劃的界面要求設(shè)置各個(gè)對(duì)象的屬性，比如對(duì)象的外貌、名稱(chēng)、顏色、大小等。 語(yǔ)法： 語(yǔ)句定義符 [語(yǔ)句體 ] 語(yǔ)句定義符用于規(guī)定語(yǔ)句的功能，語(yǔ)句體指定語(yǔ)句的具體內(nèi)容或要執(zhí)行的具體操作。 第 3 節(jié) Visual Basic 語(yǔ)言簡(jiǎn)介 Basic 是最常被用來(lái)做入門(mén)使用的高級(jí)語(yǔ)言。 第 2 節(jié)集成開(kāi)發(fā)環(huán)境 VB 的集成環(huán)境或稱(chēng) IDE，由多個(gè)部分組成，包含了標(biāo)題欄、菜單欄、工具欄、控件箱，以及窗體設(shè)計(jì)器窗口、工程管理器窗口、屬性窗口、代碼窗口和窗體布局窗體布局等。利用 ActiveX(TM)技術(shù)， VB 可使用 Microsoft Word 字處理器、Microsoft Excel 電子數(shù)據(jù)表極其他 Windows 應(yīng)用程序提供的功能，甚至可直接使用由 VB 專(zhuān)業(yè)版或企業(yè)版創(chuàng)建的應(yīng)用程序和對(duì)象。Visual Basic 有學(xué)習(xí)版、專(zhuān)業(yè)版和企業(yè)版三種版本，以滿足不同的開(kāi)發(fā)需要。③ Input. An algorithm has 0 or the many inputs, before the algorithm operation starts gives the algorithm to need the data the starting value, these inputs are from the specific object set。s software, must use each one concrete algorithm to realize. Therefore, the algorithm design and the analysis are the puter science and a technical core question. The algorithm is the problemsolving step, we may define the algorithm Cheng Jie a determination class question the random one special method. In the puter science, the algorithm needs to use the puter algorithmic language to describe, the algorithm represents with the puter solves a kind of question precisely, the effective method. The algorithm construction of data = procedure, solves one to assign may calculate or the solvable question, the different person may pile the different procedure, solves the identical problem, here has two problems: First, with putational method close related algorithm question。 this phrase is Beginners allpurpose symbolic instruction code, the Chinese meaning to the initial directive GM symbol code language. Visual Basic learning, Professional Edition and Enterprise Edition versions to meet the different needs of the development. Study and apply to the ordinary version of the majority of learners and the use of Visual Basic development of the general staff of Windows applications, but。s window of code pursued shows add codes “code editing machine” window 4. Keep project One VB procedure one project, at the time of designing a application program, system will set up one be expanded and called. Project file of vbp, project file include all relevant information of file that project set up this, Keep project keep associated documents of project this at the same time. For example the window body produced when design interfaces is kept and being expanded and being called. Frm sum. In the window body of foxfire. At the time of opening a project( file), this project relevant files load at the same time. 5. Operate and debugged by procedure Operate the procedure thoroughpin operate selecting in the menu, when the mistake appears, VB system can offer information prompt can looked for and get rid of the mistake thoroughpin debug within operate menus too. 6. Can produce by executive program For make procedure can break away from VB environment, order to bee next life through file producing project of menu but executive program (eyeful), Can carry out this file directly after this. In produce, + executive program, and then through install guide bale all associated documents, Can run independently after installation under the environment of windows 9 x/2020 as a software product. In puter system39。④ Parsing algorithm. The algorithmic analysis is requires how many puting time and the storage space to an algorithm makes the quota the analysis. The parsing algorithm may forecast that what environment this algorithm does suit in moves effectively, to solves the identical question different algorithm validity to make the parison。 (2) How to calculate one to assign the algorithm the plexity. After finding solves a question the algorithm, is this algorithm realization, as for whether could find the method which realized, was decided in the algorithm circularity and the putation plexity, whether this question did have the solution algorithm, whether to provide the time resources which and the spatial resources the algorithm needed. Visual Basic 語(yǔ)言與算法 1991 年，美國(guó)微軟公司推出了 Visual Basic(可簡(jiǎn)稱(chēng) VB），目前的最新版本是 VB 2020 Beta2(VB9)中文版。 “ Visual”指的是采用可 視化的開(kāi)發(fā)圖形用戶界面（ GUI）的方法，一般不需要編寫(xiě)大量代碼去描述界面元素的外觀和位置，而只要把需要的控件拖放到屏幕上的相應(yīng)位置即可方便圖形設(shè)計(jì)圖形用戶界面；“ Basic”指的是 BASIC 語(yǔ)言，因?yàn)?VB 是在原有的 BAISC 語(yǔ)言的基礎(chǔ)上發(fā)展起來(lái)的。企業(yè)版允許專(zhuān)業(yè)人員以小組的形式來(lái)創(chuàng)建強(qiáng)大的分布式應(yīng)用程序。一個(gè)工程一般由若干個(gè)窗體、標(biāo)準(zhǔn)模塊以及應(yīng)用環(huán)境組成。不過(guò)在后期的 Basic 則改正了以上的缺點(diǎn)（如 Quick Basic），使得它也可以用來(lái)開(kāi)發(fā)較大型的程序。 “代碼編輯器”窗口 第 4 節(jié)用 Visual Basic 開(kāi)發(fā)應(yīng)用程序 使用 VB 編程，一般先設(shè)計(jì)應(yīng)用程序 的外觀，然后再分別編寫(xiě)各對(duì)象事件的程序代碼或其他處理程序，編程的工作要輕松多。 5．行和調(diào)試程序 通過(guò)“運(yùn)行”菜單中的選項(xiàng)來(lái)運(yùn)行程序，當(dāng)出現(xiàn)錯(cuò)誤時(shí)， VB 系統(tǒng)可以提供信息提示也可通過(guò)“調(diào)試