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Object Pascal is an object oriented derivative of Pascal mostly known as the primary programming language of Borland Delphi. Object-oriented programming (OOP is a Programming paradigm that uses " objects " and their interactions to design applications and computer programs Pascal is an influential imperative and procedural Programming language, designed in 1968/9 and published in 1970 by Niklaus Wirth as a small A programming language is an Artificial language that can be used to write programs which control the behavior of a machine particularly a Computer. It is also known as the Delphi programming language when describing the dialect used by Borland Delphi, and a Modern Pascal since it is not Standard Pascal.

Borland used the name "Object Pascal" for the programming language in the first versions of Borland Delphi, but later renamed it to the "Delphi programming language". Borland Software Corporation is a software company headquartered in Austin Texas. However, compilers that claim to be Object Pascal compatible are often trying to be compatible with Delphi source code.

Borland sells integrated development environments (IDEs) that compile the Delphi programming language to Microsoft Windows, the Microsoft .NET Framework and Linux. Borland Software Corporation is a software company headquartered in Austin Texas. In Computing, an integrated development environment ( IDE) is a Software application that provides comprehensive facilities to Computer programmers Microsoft Windows is a series of Software Operating systems and Graphical user interfaces produced by Microsoft. Linux (commonly pronounced ˈlɪnəks The open source Free Pascal project allows the language to be compiled for a range of operating systems including Linux, Mac OS X, Win32, Win64, Windows CE, and for several different hardware architectures. Open source is a development methodology which offers practical accessibility to a product's source (goods and knowledge Free Pascal (or FPK Pascal or FPC is a free, portable, Open source, Pascal and Object Pascal Compiler. Linux (commonly pronounced ˈlɪnəks Mac OS X (mæk oʊ ɛs tɛn is a line of computer Operating systems developed marketed and sold by Apple Inc, the latest of which is pre-loaded on all currently The Windows API, informally WinAPI, is Microsoft's core set of Application programming interfaces (APIs available in the Microsoft Windows Operating The Windows API, informally WinAPI, is Microsoft's core set of Application programming interfaces (APIs available in the Microsoft Windows Operating Windows CE (also known officially as Windows Embedded Compact post version 6

Contents

Early history at Apple

Object Pascal is an extension of the Pascal programming language that was developed at Apple Computer by a team led by Larry Tesler in consultation with Niklaus Wirth, the inventor of Pascal. Pascal is an influential imperative and procedural Programming language, designed in 1968/9 and published in 1970 by Niklaus Wirth as a small Apple Inc, ( formerly Apple Computer Inc, is an American Multinational corporation with a focus on designing and manufacturing Consumer electronics Larry (formally Lawrence Gordon Tesler (born April 24, 1945) is a Computer scientist working in the field of Human-computer interaction Niklaus Emil Wirth (b February 15, 1934) is a Swiss computer scientist, best known for designing several Programming languages including It is descended from an earlier object-oriented version of Pascal called Clascal, which was available on the Lisa computer. Clascal was an Object-oriented programming language developed in 1983 by the Personal Office Systems (POS division (later renamed The Lisa Division, still For the MOS 6502 assembler for Apple II computers see Lisa assembler.

Object Pascal was needed in order to support MacApp, an expandable Macintosh application framework that would now be called a class library. MacApp was Apple Computer 's primary Object oriented Application framework for the Mac OS for much of the 1990s Object Pascal extensions and MacApp itself were developed by Barry Haynes, Ken Doyle, Larry Rosenstein, and tested by Dan Allen. For the pioneer gambler in Omaha Nebraska see Dan Allen (gambler Dan Allen (1973 to present is a Stand-up comedian currently based Larry Tesler oversaw the project, which began very early in 1985 and became a product in 1986. Larry (formally Lawrence Gordon Tesler (born April 24, 1945) is a Computer scientist working in the field of Human-computer interaction

Apple dropped support for Object Pascal when they moved from Motorola 68K chips to IBM's PowerPC architecture in 1994.

Object Pascal extension also have been implemented in the Think Pascal IDE. The IDE includes not only the compiler, but also an editor with Syntax highlighting and checking, a very powerful debugger and a class library. Many developers preferred Think Pascal instead of MacApp because it offered a tight integration of its tools. The development stopped after the 4. 01 version, because the company was bought by Symantec. The developers then left the project.

The Borland years

In 1986, Borland introduced similar extensions, also called Object Pascal, to the Turbo Pascal product for the Macintosh, and in 1989 for Turbo Pascal 5. Borland Software Corporation is a software company headquartered in Austin Texas. Turbo Pascal is a complete software development system that includes a Compiler and an Integrated Development Environment (IDE for the Pascal programming language 5 for DOS. When Borland refocused from DOS to Windows in 1994, they created a successor to Turbo Pascal, called Delphi and introduced a new set of extensions to create what is now known as the Delphi language. DOS, short for "Disk Operating System" is a shorthand term for several closely related Operating systems that dominated the IBM PC compatible market Microsoft Corporation is an American multinational Computer technology Corporation, which rose to dominate the Home computer The development of Delphi started some time in 1993 and Delphi 1. 0 was officially released in the US on 14 Feb 1995. It featured an incompatible syntax using the keyword class in preference to object, the Create constructor and a virtual Destroy destructor (and negating having to call the New and Dispose procedures), properties, method pointers, and some other things. These were obviously inspired by the ISO working draft for object-oriented extensions, but many of the differences to Turbo Pascal's dialect (such as the draft's requirement that all methods be virtual) were ignored. The Delphi language continued to evolve throughout the years to support new language concepts such as 64-bit integers and dynamic arrays.

Version 3

Delphi 3. 0 documentation says it works with Microsoft Windows 95, NT 3. 51 (SP5+), or NT 4. 0 Workstation. It came with a Delphi-edition of the InstallShield Express product. Depending on options installed, 50 to 170 MB of disk space on the developer's machine were required. Required hardware was shown as:

Version 3 had options for native database connectivity with Oracle, Sybase Db-Lib, Microsoft SQL Server, Informix, DB/2, and InterBase back-ends. Some packages were bundled with Borland's InterBase SQL which was supposed to run on either Windows 95 or NT. This development version of Interbase was limited to four simultaneous users.

A complete copy of Delphi 1. 0 was included on the CD for those still doing 16-bit Windows 3. 1 development.

Compilers

There are many compilers that are more or less compatible with the Object Pascal language from Delphi. Many of these were created to enable the use of Object Pascal source code on different platforms, and under various licenses.

Interpreters

Pascal Script (formerly known as InnerFuse) is an open source Object Pascal interpreter/scripting engine written in Delphi. Supports a limited subset of Object Pascal.

Example "hello world" programs

Apple's Object Pascal

program ObjectPascalExample;

   type
      THelloWorld = object
         procedure Put;
      end;

   var
      HelloWorld: THelloWorld;

   procedure THelloWorld. Put;
   begin
      WriteLn('Hello, World!');
   end;

begin
   New(HelloWorld);
   HelloWorld. Put;
   Dispose(HelloWorld);
end.

Turbo Pascal's Object Pascal

program ObjectPascalExample;

   type
      PHelloWorld = ^THelloWorld;
      THelloWorld = object
         procedure Put;
      end;

   var
      HelloWorld: PHelloWorld; { this is a pointer to a THelloWorld }

   procedure THelloWorld. Put;
   begin
      WriteLn('Hello, World!');
   end;

begin
   New(HelloWorld);
   HelloWorld^. Put;
   Dispose(HelloWorld);
end.

Delphi And Free Pascal's Object Pascal

program ObjectPascalExample;

   type
      THelloWorld = class
         procedure Put;
      end;

   var
      HelloWorld: THelloWorld;

   procedure THelloWorld. Put;
   begin
      WriteLn('Hello, World!');
   end;

begin
   HelloWorld := THelloWorld. Create;
   HelloWorld. Put;
   HelloWorld. Free;
end.

However, the above syntax/notation is not required - it is optional to use objects, as seen in the below hello world alternative:

program Example;
begin
   WriteLn('Hello World');
end.

Oxygene Object Pascal

namespace ObjectPascalExample;

   interface

   type
      ConsoleApp = class
         class method Main
      end;

      THelloWorld = class
         method Put;
      end;

   implementation

   method THelloWorld. Oxygene (formerly known as Chrome) is a programming language developed by RemObjects Software for the Common Language Infrastructure. Put;
   begin
      Console. WriteLine('Hello, World!');
   end;

   class method ConsoleApp. Main;
   begin
      var HelloWorld := new THelloWorld;
      HelloWorld. Put;
   end;

end.

Object Pascal in the software market

Although C++, .NET and Java dominate the software industry market, Delphi has a considerable market share and strong presence [1]. C++ (" C Plus Plus " ˌsiːˌplʌsˈplʌs is a general-purpose Programming language.

See also

External links

References

  1. ^ TIOBE index. Programming languages are used for controlling the behavior of a machine (often a Computer) TIOBE Software. Retrieved on 2008-04-25. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 1607 - Eighty Years' War: The Dutch fleet destroys the anchored Spanish fleet at Gibraltar.

CodeGear

RemObjects Software

Introduction to Object Pascal

Delphi communities

Delphi's Object Pascal Language guide

Free Pascal Object Pascal reference guide

Tools For Object Pascal

GNU Pascal

paxCompiler

Free Pascal (or FPK Pascal or FPC is a free, portable, Open source, Pascal and Object Pascal Compiler. GNU Pascal (GPC is a Pascal Compiler comprised of a frontend to GCC, similar to the way Fortran and other languages were added to GCC
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