Lazarus, which implements packages of components).įree Pascal emerged when Borland made clear there would be no Borland Pascal 8, and the next versionwould be a Windows-only product (which became Delphi later on), and a student (Florian Paul Klämpfl) started working on his own compiler. The project still has missing Delphi functionality, mainly compiler supported exporting of classes from shared libraries (useful for e.g.
The 2.2.x series doesn't significantly change the dialect objectives beyond D7, instead aiming for close compatibility.
Since the Apple dialect implements some of the Standard Pascal features that TP/Delphi miss, FPC is a bit more ISO compatible than these.
However, the project has a compilation mode concept, and the developers made it clear that they would incorporate working patches for the ANSI/ISO standardised dialects to create a standards compliant mode.Ī small effort has been made to support some of the Apple Pascal syntax, to ease interfacing to Mac OS (X). (Specifically: Borland Pascal 7 and Delphi 2 for version 1.0.x, and for version 2.0.x the target versions for the Delphi compatibility changed to 6/7). The visual parts of the Delphi libraries (the VCL) and the creation of a visual IDE and RAD are part of a separate project, Lazarus.įPC adopted the de facto standard dialects of Pascal programmers: the Borland dialects. FPC supports multiple architectures and notations in the internal assembler. Like Turbo Pascal and Delphi, Free Pascal has excellent support for integration of assembly language in the Pascal code. This IDE deteriorated for some time because of a missing maintainer, but in a common effort in the second half of 2005 and the first months of 2006, most major bugs were fixed and the IDE became release-worthy again. To avoid this confusion, at the end of 1997 the name of the project was changed into Free Pascal Compiler (FPC).įree Pascal comes with a text user interface IDE resembling Turbo Pascal's IDE ( Turbo Vision). Writing "Compiler" with K is uncommon in German. FPK Pascal never meant "Free Pascal Kompiler". The 32/64-bit multi-architecture and multi-operating system compiler implements the Borland Pascal dialects ( Turbo Pascal and Delphi) as well as some MacPascal constructs, and is available formost common operating systems.įree Pascal used to be known as FPK Pascal, since FPK are the initials of the author, Florian Paul Klämpfl. Make sure that free pascal compiler fpc is in your path and that you are running it in the directory containing source file = Free Pascal being operated via the command lineįree Pascal (or FPK Pascal or FPC) is a free, portable, open source, Pascal and Object Pascal compiler. You will be able to see "Hello World" printed on the screen and program waits till you press any key.įree Pascal Compiler version 2.6.0 for x86_64Ĭopyright (c) 1993-2011 by Florian Klaempfl and others Now, type hello at command prompt to execute your program. If there are no errors in your code, the command prompt will take you to the next line and would generate hello executable file and hello.o object file. Type fpc hello.pas at command prompt and press enter to compile your code. Open a command prompt and go to the directory, where you saved the file. Open a text editor and add the above-mentioned code. The statement readkey allows the display to pause until the user presses a key. The statement writeln('Hello, World!') uses the writeln function available in Pascal which causes the message "Hello, World!" to be displayed on the screen. The lines within (*.*) will be ignored by the compiler and it has been put to add a comment in the program. The begin statement of the main program block is where the program execution begins.
However, the end statement indicating the end of the main program is followed by a full stop (.) instead of semicolon ( ). Every block in Pascal is enclosed within a begin statement and an end statement. The next lines enclosed within begin and end statements are the main program block. The second line of the program uses crt is a preprocessor command, which tells the compiler to include the crt unit before going to actual compilation. The first line of the program program HelloWorld indicates the name of the program. Let us look various parts of the above program −
Uses įollowing is a simple pascal code that would print the words "Hello, World!" − Following format shows the basic syntax for a Pascal program − Statements and Expressions within each blockĮvery pascal program generally has a heading statement, a declaration and an execution part strictly in that order.Pascal Program StructureĪ Pascal program basically consists of the following parts − Before we study basic building blocks of the Pascal programming language, let us look a bare minimum Pascal program structure so that we can take it as a reference in upcoming chapters.