An overview of visual basic NET ppt

Overview-An Overview of Visual Basic .NET 1 An Overview of Visual Basic .NET Overview-An Overview of Visual Basic .NET 2 Overview Objectives  This overview contains basic definitions and background information, including:  A brief history of programming languages  An introduction to the terminology used in object-oriented programming languages  A Visual Basic demonstration  Information on using the tutorials effectively Overview-An Overview of Visual Basic .NET 3 A Brief History of Programming Languages  Computers still rely on human beings to give them directions  These directions are called programs, and the people who write the programs are called programmers  Just as human beings communicate with each other through the use of languages such as English, Spanish, Hindi, and Chinese, programmers use a variety of special languages, called programming languages, to communicate with the computer Overview-An Overview of Visual Basic .NET 4 Machine Languages  Within a computer, data are represented by microscopic electronic switches that can be either off or on  The off switch is designated by a 0  The on switch is designated by a 1  Instructions written in 0s and 1s are called machine language or machine code  Each type of machine has its own language  Machine languages represent the only way to communicate directly with the computer Overview-An Overview of Visual Basic .NET 5 Assembly Languages • Slightly more advanced programming languages are called assembly languages • Assembly languages simplify the programmer’s job by allowing the programmer to use mnemonics in place of the 0s and 1s in the program • Mnemonics are memory aids—in this case, alphabetic abbreviations for instructions Overview-An Overview of Visual Basic .NET 6 Assembly Languages  For example, the mnemonic MOV is used to move data from one area of the computer’s memory to another  Programs written in an assembly language require an assembler  The assembler is also a program  It converts the assembly instructions into machine code—the 0s and 1s the computer can understand Overview-An Overview of Visual Basic .NET 7 High-Level Languages  High-level languages  Allow the programmer to use instructions that more closely resemble the English language  Represent the next major development in programming languages  Programs written in a high-level language require either an interpreter or a compiler to convert the English-like instructions into the 0s and 1s the computer can understand Overview-An Overview of Visual Basic .NET 8 High-Level Languages  Like assemblers, both interpreters and compilers are separate programs  An interpreter translates the high-level instructions into machine code, line by line, as the program is running  A compiler translates the entire program into machine code before running the program Overview-An Overview of Visual Basic .NET 9 Procedure-Oriented High-Level Languages  In procedure-oriented high-level languages, the emphasis of a program is on how to accomplish a task  The programmer must instruct the computer every step of the way, from the start of the task to its completion  The programmer determines and controls the order in which the computer processes the instructions Overview-An Overview of Visual Basic .NET 10 Procedure-Oriented High-Level Languages  Examples include:  COBOL  BASIC (Beginner’s All-Purpose Symbolic Instruction Code)  C  Procedure-oriented high-level languages are a vast improvement over machine and assembly languages  Some of the procedure-oriented high-level languages —for example, the BASIC language—do not require a great amount of technical expertise to write simple programs [...]... and buttons included in most Windows programs  An object also can represent something encountered in real life  Every object has attributes and behaviors Overview -An Overview of Visual Basic NET 16 Object An Object:  Is Anything that can be seen or touched  Has attributes that describe it  Has behaviors that the object can either perform or have performed on it Overview -An Overview of Visual Basic. .. help you learn about Microsoft Visual Basic NET, the newest version of the Visual Basic programming language  At the end of Lesson C in each tutorial you will find one or more Debugging exercises  In programming, the term debugging refers to the process of finding and fixing any errors in a program Overview -An Overview of Visual Basic NET 23 Using the Tutorials Effectively  Hands-on at your computer... class from another class  The new class, called the derived class, inherits the attributes and behaviors of the original class, called the base class  Polymorphism is the object-oriented feature that allows the same instruction to be carried out differently depending on the object Overview -An Overview of Visual Basic NET 21 Monthly Payment Application Overview -An Overview of Visual Basic NET 22 Using... Overview -An Overview of Visual Basic NET 19 Inheritance  Allows you to create one class from another class  The new class is called the derived class  The original class is called the base class Overview -An Overview of Visual Basic NET 20 OOP Terminology  Attributes and behaviors that are not hidden are said to be exposed to the user  Anther OOP term, inheritance, refers to the fact that you can create one... Overview -An Overview of Visual Basic NET 13 Object-Oriented/Event-Driven High-Level Languages  The ability to use objects that model things found in the real world makes problem solving much easier  Visual Basic NET is an object-oriented/event-driven programming language that is easy enough for a nonprogrammer to use, yet sophisticated enough to be used by professional programmers  With Visual Basic. .. takes just a few clicks of the mouse to include standard Windows objects such as buttons, list boxes, scroll bars, and icons in your Windows application Overview -An Overview of Visual Basic NET 14 OOP Terminology  OOP is an acronym for object-oriented programming  It means that you are using an object-oriented language to create a program that contains one or more objects  OOD is an acronym for object-oriented... top-down design, which is used to plan procedure-oriented programs, OOD is also a design methodology, but it is used to plan objectoriented programs  OOD divides a problem into one or more objects Overview -An Overview of Visual Basic NET 15 OOP Terminology  An object is anything that can be seen, touched, or used  The objects used in an object-oriented program can take on many different forms  Objects... scroll bars, dialog boxes, and menus needed in all Windows applications  Tasks that used to take a few lines of program code now needed pages  Because programming Windows applications required a great amount of expertise, it appeared that the beginning of the Windows environment meant the end of the do-it-yourself, nonprofessional programmer Overview -An Overview of Visual Basic NET 12 Object-Oriented/Event-Driven... encapsulates—all of the attributes and behaviors that describe the object the class creates  Objects created from a class are referred to as instances of the class, and are said to be “instantiated” from the class  Abstraction refers to the hiding of the internal details of an object from the user  Hiding the internal details helps prevent the user from making inadvertent changes to the object Overview -An Overview. .. of Visual Basic NET 17 OOP Terminology  The attributes are the characteristics that describe the object  An object’s behaviors, on the other hand, are the operations (actions) that the object is capable of performing  A class is a pattern or blueprint used to create an object  Every object used in an object-oriented program comes from a class Overview -An Overview of Visual Basic NET 18 OOP Terminology . Overview -An Overview of Visual Basic .NET 1 An Overview of Visual Basic .NET Overview -An Overview of Visual Basic .NET 2 Overview Objectives  This overview contains basic definitions and. the 0s and 1s the computer can understand Overview -An Overview of Visual Basic .NET 8 High-Level Languages  Like assemblers, both interpreters and compilers are separate programs  An interpreter. objects Overview -An Overview of Visual Basic .NET 16 OOP Terminology  An object is anything that can be seen, touched, or used  The objects used in an object-oriented program can take on many