For example, an array may consist of the number of students in each grade in a grammar school; each element of the array is the number of students in a single grade.
Programmers can create both simple and complex GUI applications. Programming in VB is a combination of visually arranging components or controls on a formspecifying 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 and later, but extended runtime components still have to be installed. An empty form in Visual Basic 6 Forms are created using drag-and-drop techniques. 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.
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.
This allows for server-side processing or an add-in module. The runtime recovers unused memory using reference countingwhich depends on variables passing out of scope or being set to Nothing, avoiding the problem of memory leaks that are possible in other languages.
There is a large library of utility objects, and the language provides basic support for object-oriented programming.
Unlike many other programming languages, Visual Basic is generally not case-sensitive—though it transforms keywords into a standard case configuration and forces the case of variable names to conform to the case of the entry in the symbol table.
String comparisons are case sensitive by default. 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. Versions since at least VB 3.
The result stored in A would therefore be either false or true. This inherent functionality becomes especially useful when performing logical operations on the individual bits of an integer such as And, Or, Xor and Not.
Logical and bitwise operators are unified. This is unlike some C-derived languages such as Perlwhich have separate logical and bitwise operators. 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.
This uncommon trait does exist in Visual Basic. Relatively strong integration with the Windows operating system and the Component Object Model. Banker's rounding as the default behavior when converting real numbers to integers with the Round function. By default, if a variable has not been declared or if no type declaration character is specified, the variable is of type Variant.
There are 12 Deftype statements in total offered by Visual Basic 6. The default type may be overridden for a specific declaration by using a special suffix character on the variable name for Double,!
VB can also be set in a mode that only explicitly declared variables can be used with the command Option Explicit. History[ edit ] Alan Cooper created the drag-and-drop design for the user interface of Visual Basic. The drag and drop design for creating the user interface is derived from a prototype form generator developed by Alan Cooper and his company called Tripod.
Tripod did not include a programming language at all.Create professional-quality applications, components, and user interfaces faster and more efficiently than ever with the powerful object-oriented programming capabilities in the Visual Basic development initiativeblog.coms: Aug 21, · The Visual Basic Upgrade Assessment Tool measures application upgrade effort.
This tool analyzes the application components and the relationships between them from an upgrade perspective, considering elements, constructs, and features that consume resources during an upgrade. Programming in Visual Basic Update Edition with CD Oct 19, by Julia Case Bradley and Anita Millspaugh.
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Read eBook on the web, iPad, iPhone and Android Visual Basic is one of the easiest to learn computer programming language and yet . Visual Basic is over 20 year old! There have been several upgrades to Visual Basic since then.
The information is the book may be useful for developers who are still using this version but it will not be of great interest to those who use later versions of VB/5(3).