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计算机专业及相关英文文献翻译.doc
Visual Basic language and arithmetic
The United States launched the Microsoft Visual Basic (may be referred to
VB), is the latest version of the current VB 2008 Beta2 (VB9) Chinese version.
Visual meaning the visual, visible, referring to the development of operating
systems like windows graphical user interface (Graphic User Interface, GUI) method,
it does not need to prepare a large number code to describe the appearance of the
interface elements and location, as long as the pre - The establishment of good drag
and drop objects on the screen corresponding to the location.
Basic is actually an abbreviation of the phrase;
this phrase is Beginners
all-purpose 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; professional version for computer professional
development of staff, including the study of functional version of the full content
control and Internet development tools such as advanced features ,Enterprise contain
not only all the professional version of the content, there are automated tools such as
Component Manager, professional programmers to make the development of a
powerful group essence of distributed applications.
Visual Basic
Section 1 the summary of Visual Basic
Microsoft Visual Basic,( abbreviate VB )as tool the most of application program
one of under Windows operating platform. No matter beginner or professional
developer, VB has all offered a whole set of tools to them, Development application
program that it can be relaxed and convenient. So VB as most computer first-selected
the ABC of programming language of beginner.
" Visual" mean method to adopt visual user of development figure interface
(GUI), need and write a large number of code go and describe interface appearance
and position of element seldom, Tow and show controlling part
that need
corresponding position to get screen can help figure design interface, user of figure,; "
Basic" means BASIC language, because VB is developed on the basis of already
existing BAISC language.
VB is a kind of programming language in common use of Microsoft, It, including
VBA of the numerous Windows application software use VB language in Microsoft
Excel, Microsoft Accessed., For users to carry on the secondary development; Make
web page use more VBScript script language sub collection of VB too at present.
Utilize data of VB visit characteristic user can establish the data base to most data
base forms including Microsoft SQL Server and other enterprises data base With the
application program of front, and adjustable service end part. Utilize ActiveX(TM)
technology, VB can use word processor, electronic data list he Windows function that
application program offers extremely, Excel of Microsoft,, Word of Microsoft,, Even
can use by VB specialty edition or enterprise application program and target that
edition establish directly.
The procedure that users established finally is a real .EXE file , can issue freely .
the specialty edition and enterprise edition, use to
VB offer study edition,
satisfied with different development demands. Study edition make programming
personnel develop Windows and Windows application program of NT very easily. The
specialty edition has offered the developing instrument with complete function to
programming personnel of the specialty, Include studying all functions of edition in
the specialty edition. Enterprise edition allow the professional personnel to establish
strong distributed application program in the form of group.
includes all
characteristics of the specialty edition. So can choose different editions according to
different needs.
It
Section 2 integrated development environments
Integrated environment of VB call IDE, made up of a lot of parts , include title
board, menu fence, tool fence, controlling part case, And window body window,
engineering management device window, attribute window, code window and
window body overall arrangement window body overall arrangement, etc. of
designing etc.. Have covered all functions, such as design which develops the
application program, editting, compiling and debugging, etc..
In VB, the application program calls the project too. When start VB and open a
new project for the first time, can see and pursue integrated development environment
interface that show.
Visual Basic Integrated development environment
VB come and organize development of application program through project, use
project come and manage and form files of application program. One project uses the
environment to make up by several window bodies, standard module generally. The
system manages project through the project menu, for instance add the window body,
quote . System allow turn on and manage a lot of projects besides.
Section 3 Visual Basic language brief introductions
Basic use and do the elementary high-level language that used often most. Its full
name is Beginner' s All-purpose Symbolic Instruction Code, abbreviate as BASIC. As
its name suggests, Basic one specially for language that beginner design, because it
easy to learn easy to know, So the body is popular. Early Basic language to belong to
and solve translating type, so can carry out line by line , So it can see the result carried
out at once , this is a very convenient design for beginner. But it have concept of
structure either, one that is in procedure maintain and management have as much as
other language problems. But back-end Basic correct shortcoming of the above (such
as Quick Basic), make it may used for and develop the large-scaler procedure too.
The language is the basic composition, which forms VB procedure. VB has
stipulated the form of sentences and function.
Grammar:
The sentence defines incantations [Sentence body]
Sentence define agree with and used in fixed function of sentence, sentence body
appoint concrete content or want concrete operation that carry out of sentence. All set
of sentence VB language, carry on with VB sentence organic association finish a
certain specific function the procedure. Interface + procedure can solve a certain
application problem.
VB application program code window write in" code editing machine" generally.
" editing machine of code" is like the word processing software of a piece of height
specialization, there are many easies function of writing VB code, Pursue to show
[Example Ex-Hello ]In" code editing machine" code that window written.
“Editing machine of code” window
Section 4 develop the application program with Visual Basic
Use VB programming, design appearance of application program first generally,
incident
treatment procedure of
write every target procedure code or other
respectively, Work of programming should be light more.
The procedure of establishing the application program is as follows:
Establish application program interface
The interface is the mutual bridge of user and procedure, Generally formed of
window body and vision frame of the button, menu, text frameset. with standard
WINDOWS interface of application program that VB establish. Require according to
function of procedure and user and need of information interchange of procedure,
Come to confirm that need those targets , plan the overall arrangement of the
interface.
2. Design by each attributes of target in interface
Demand and set up each attribute of target such as appearance, name,, size of
targeted. according to interface of planning.
Most attribute person who fetch can set up through the attribute window when
design already, Too can set up revising when operating in procedure through
programming in procedure code. Have the targets respond programming by procedure
code
3. Respond procedure code of programming target
Interface determine appearance of procedure only, design window add codes
through" code editing machine" soon after the interface, Realize some make the tasks,
such as responding, information processing,etc. after accepting external message, Add
code , realize some response,
information processing that make after accepting
external information task, As editor'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 become next
life through" file"" producing project 1.exe" 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/2000 as a software product.
In computer system's any software, is by the every large or small each kind of
software constituent constitution, defers to the specific algorithm to realize
respectively, the algorithm quality direct decision realizes the software performance
fit and unfit quality. Designs the algorithm with any method, what resources designs
the algorithm to need, requires how many running time, how many storage space, how
to determine an algorithm the quality, when realizes a software, is must give to solve.
In computer system's operating system, the language compiling system, the database
management system as well as in various computer application system's software,
must use each one concrete algorithm to realize. Therefore, the algorithm design and
the analysis are the computer science and a technical core question.
The algorithm is the problem-solving step, we may define the algorithm Cheng
Jie a determination class question the random one special method. In the computer
science, the algorithm needs to use the computer algorithmic language to describe, the
algorithm represents with the computer 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 compile the
different procedure, solves the identical problem, here has two problems: First, with
computational method close related algorithm question; Second, programming
technical question. Between the algorithm and the procedure has the close relationship.
The algorithm is a group has the poor rule, they had stipulated solves some specific
type question a series of operations, is to the problem solving plan accurate and the
complete description. Formulates an algorithm, generally must pass through stages
and so on design, confirmation, analysis, code, test, debugging, time. To algorithm
study including five aspect contents:① Design algorithm. The algorithm design work
is impossible completely the automation, should study the understanding already by
the practice to prove that was the useful some basic algorithm design method, these
basic design method was not only suitable for the computer science, moreover was
suitable for domains and so on electrical engineering, operations research;②
Expresses the algorithm. The description algorithm's method has many kinds of forms,
for example the natural language and the algorithmic language, have the suitable
environment and the characteristic respectively;③Confirms the algorithm. The
algorithm confirmed the goal is causes the people to believe firmly that this algorithm
can work unmistakably correctly, namely this algorithm has the circularity. The
correct algorithm describes with the computer algorithmic language, constitutes the
computer program,
the computer program moves on the computer, obtains the
algorithm operation result;④ Parsing algorithm. The algorithmic analysis is requires
how many computing 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 comparison;⑤ Confirmation algorithm. With machine language
description algorithm whether can calculate effectively, reasonable, must carry on the
test to the procedure, the test order work and makes the space and time distribution
map by the debugging to be composed.
But
it
the algorithm has certain characteristic,
includes:① Determinism.
Algorithm each kind of operation must have the determination significance, this kind
of operation should carry out what kind of movement should not
to have the
ambiguity, the goal is clear;② Effectiveness. Requests the operation which in the
algorithm waits for realizing is basic, each kind of operation can at least completes in
the principle by the human with the paper and the pen in the limited time;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;④ Output. Does for the algorithm operation result, an algorithm has or many
outputs, the output has some kind of specific relational quantity with the input;⑤ Has
poor. An algorithm always after carrying out had the poor step operation has
terminated, namely this algorithm was may reach.
Satisfies a first four characteristic group of rule not to be able to be called the
algorithm, can only be called the computational process, the operating system is a
computational process example,
the operating system uses for to manage the
computer resources, controls the manufacture industry movement, when has not made
industry the movement, the computational process does not stop, but is at the waiting
status.
The algorithm complexity is the algorithm efficiency measure, when appraises
the algorithm performance, the complexity is an important basis. The algorithm
complex degree with moves computer resources how many which this algorithm
needs related, needs the resources are more,
this algorithm the
complexity is higher; Needs the resources are less, indicated that this algorithm the
indicated that
complexity is lower.
The spatial resources, which computer’s resources, operate most importantly,
the algorithm
needs the time which and the stored routine and the data need,
complexity has division time complexity and the spatial complexity.
The algorithm carries out the operation on the computer, needs the data which
certain storage space depositing description algorithm the procedure and the algorithm
need,
the computer completes the operation task to require certain time. The
procedure which writes according to the different algorithm places when on the
computer operates, needs the time and the space are different,
the algorithm
complexity is needs the time and the spatial one kind of measure to the algorithm
operation. The different computer its operating speed difference is very big,
is
weighing an algorithm the complexity to note this point.
Regarding question, which assigns willfully, a profitable target which designs,
the complex low algorithm is as far as possible when designs algorithm considered.
Moreover, when the question, which assigns already when has many kinds of
algorithms, an important criterion which choice complexity low, is when selects
algorithm should follow. Therefore, the algorithm complex analysis or selects to the
algorithm design has the important guiding sense and the use value.
When discussion algorithm complexity, two questions need to clarify:
(1) An algorithm's complexity expresses with what kind of quantity;
(2) How to calculate one to assign the algorithm the complexity. 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
computation complexity, whether this question did have the solution algorithm,
whether to provide the time resources which and the spatial resources the algorithm
needed.
Visual Basic 语言与算法
1991 年，美国微软公司推出了 Visual Basic(可简称 VB），目前的最新版本
是 VB 2008 Beta2(VB9)中文版。
Visual 意即可视的、可见的，指的是开发像 windows 操作系统的图形用户
界面（Graphic User Interface,GUI）的方法，它不需要编写大量代码去描述界
面元素的外观和位置，只要把预先建立好的对象拖放到屏幕上相应的位置即可。
Basic 实际上是一个短语的缩写，这个短语就是 Beginners all_purpose
symbolic instruction code ，其中文意思为“初始者通用符号指令代码语言”。
Visual Basic 有学习版、专业版和企业版三种版本，以满足不同的开发需要。
学习版适用于普通学习者及大多数使用 Visual Basic 开发一般 Windows 应用程
序的人员，但是；专业版适用于计算机专业开发人员，包括了学习版的全部内容
功能以及 Internet 控件开发工具之类的高级特性；企业版除包含专业版全部的
内容外，还有自动化构件管理器等工具，使得专业编程人员能够开发功能强大的
组骨子里分布式应用程序。
Visual Basic
第 1 节 Visual Basic 的概述
Microsoft Visual Basic(简称 VB)是在 Windows 操作平台下设计应用程序
的最速度、最简捷的工具之一。不论是初学者还是专业开发人员，VB 都为他们
提供了一整套的工具，可以轻松方便的开发应用程序。因此，VB 一直被作为大
多数电脑初学者的首选入门编程语言。
“Visual”指的是采用可视化的开发图形用户界面（GUI）的方法，一般不
需要编写大量代码去描述界面元素的外观和位置，而只要把需要的控件拖放到屏
幕上的相应位置即可方便图形设计图形用户界面；“Basic”指的是 BASIC 语言，
因为 VB 是在原有的 BAISC 语言的基础上发展起来的。
VB 是 Microsoft 的一种通用程序设计语言，它包括在 Microsoft Excel、
Microsoft Access 等众多 Windows 应用软件中的 VBA 都使用 VB 语言，以供用户
进行二次开发；目前制作网页使用较多的 VBScript 脚本语言也是 VB 的子集。
利用 VB 的数据访问特性用户可以对包括 Microsoft SQL Server 和其他企
业数据库在内的大部分数据库格式创建数据库和前端应用程序，以及可调整的服
务端部件。利用 ActiveX(TM)技术，VB 可使用 Microsoft Word 字处理器、
Microsoft Excel 电子数据表极其他 Windows 应用程序提供的功能，甚至可直接
使用由 VB 专业版或企业版创建的应用程序和对象。
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