Visual Basic - Wikipedia, the free encyclopedia. This article is about the Visual Basic language shipping with Microsoft Visual Studio 6. For the Visual Basic language shipping with Microsoft Visual Studio . NET or later, see Visual Basic . NET. Visual Basic is a third- generationevent- driven programming language and integrated development environment (IDE) from Microsoft for its Component Object Model (COM) programming model first released in 1. Download 100 Years To Live Chords And Lyrics here. Microsoft intended Visual Basic to be relatively easy to learn and use.
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Like the BASIC programming language, Visual Basic was designed to accommodate a steep learning curve. Programmers can create both simple and.
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Over time the community of programmers developed third party components. On April 8, 2. 00.
Microsoft stopped supporting Visual Basic 6. IDE. The Microsoft Visual Basic team still maintains compatibility for Visual Basic 6. Windows Vista, Windows Server 2. R2, Windows 7, Windows 8, Windows 8. Windows Server 2. Windows 1. 0 through its .
Programmers can create both simple and complex GUI applications. Programming in VB is a combination of visually arranging components or controls on a form, specifying attributes and actions for those components, and writing additional lines of code for more functionality. Since VB defines default attributes and actions for the components, a programmer can develop a simple program without writing much code. Programs built with earlier versions suffered performance problems, but faster computers and native code compilation has made this less of an issue. Core runtime libraries are included by default in Windows 2.
Earlier versions of Windows (9. NT), require that the runtime libraries be distributed with the executable. A tool is used to place controls (e.
Controls have attributes and event handlers associated with them. Default values are provided when the control is created, but may be changed by the programmer. Many attribute values can be modified during run time based on user actions or changes in the environment, providing a dynamic application. For example, code can be inserted into the form resize event handler to reposition a control so that it remains centered on the form, expands to fill up the form, etc. By inserting code into the event handler for a keypress in a text box, the program can automatically translate the case of the text being entered, or even prevent certain characters from being inserted. Visual Basic can create executables (EXE files), Active. X controls, or DLL files, but is primarily used to develop Windows applications and to interface database systems.
Dialog boxes with less functionality can be used to provide pop- up capabilities. Controls provide the basic functionality of the application, while programmers can insert additional logic within the appropriate event handlers. For example, a drop- down combination box automatically displays a list. When the user selects an element, an event handler is called that executes code that the programmer created to perform the action for that list item. Alternatively, a Visual Basic component can have no user interface, and instead provide Active.
X objects to other programs via Component Object Model (COM). This allows for server- side processing or an add- in module. The runtime recovers unused memory using reference counting, which depends on variables passing out of scope or being set to Nothing, avoiding the problem of memory leaks common to other languages. There is a large library of utility objects, and the language provides basic object oriented support. Unlike many other programming languages, Visual Basic is generally not case sensitive.
String comparisons are case sensitive by default. The Visual Basic compiler is shared with other Visual Studio languages (C, C++).
Nevertheless, by default the restrictions in the IDE do not allow creation of some targets (Windows model DLLs) and threading models, but over the years, developers have bypassed these restrictions. Characteristics. A = B = C does not imply that the values of A, B and C are equal. The boolean result of . The result stored in A would therefore be either false or true. Boolean constant True has numeric value .
This is apparent when performing a Not operation on a 1. This inherent functionality becomes especially useful when performing logical operations on the individual bits of an integer such as And, Or, Xor and Not. This is unlike some C- derived languages (such as Perl), which have separate logical and bitwise operators. This again is a traditional feature of BASIC. Variable array base.
Arrays are declared by specifying the upper and lower bounds in a way similar to Pascal and Fortran. It is also possible to use the Option Base statement to set the default lower bound. Use of the Option Base statement can lead to confusion when reading Visual Basic code and is best avoided by always explicitly specifying the lower bound of the array. This lower bound is not limited to 0 or 1, because it can also be set by declaration. In this way, both the lower and upper bounds are programmable. In more subscript- limited languages, the lower bound of the array is not variable.