- #FREE PASCAL 3.0.0 HOW TO#
- #FREE PASCAL 3.0.0 SOFTWARE#
- #FREE PASCAL 3.0.0 CODE#
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Separate projects exist to facilitate developing cross-platform graphical user interface (GUI) applications, the most prominent one being the Lazarus integrated development environment (IDE). It supports inline assembly language and includes an internal assembler capable of parsing several dialects such as AT&T and Intel style. It follows a write once, compile anywhere philosophy, and is available for many CPU architectures and operating systems (see Targets). The dialect is selected on a per-unit (module) basis, and more than one dialect can be used per program. It supports its own Object Pascal dialect as well as the dialects of several other Pascal family compilers to a certain extent, including those of Turbo Pascal, Delphi, and some historical Macintosh compilers.
#FREE PASCAL 3.0.0 SOFTWARE#
It is free software released under the GNU General Public License, with exception clauses that allow for static linking against its runtime libraries and packages for any purpose in combination with any other software license.
#FREE PASCAL 3.0.0 LICENSE#
GNU General Public License with static linking exception for the runtime, package, component and other libraries that become part of executables created with the compiler.įree Pascal Compiler ( FPC) is a compiler for the closely related programming language dialects, Pascal and Object Pascal. GNU General Public License for the compiler and utility executables.
#FREE PASCAL 3.0.0 CODE#
When the above code is compiled and executed, it produces the following result −Īrea of Circle with radius 7.0 is: 153.938Īrea of Triangle 3.0 by 4.0 by 5.0 is: 6. Writeln('Area of Triangle 3.0 by 4.0 by 5.0 is: ', area:7:3) Writeln('Area of Circle with radius 7.0 is: ', area:7:3) Writeln('Area of Rectangle 5.4 x 4.7 is: ', area:7:3)
Next, let us write a simple program that would use the unit we defined above − The following program creates the unit named calculateArea −įunction RectangleArea( length, width: real): real įunction CircleArea(radius: real) : real įunction TriangleArea( side1, side2, side3: real): real Īrea := sqrt(s * (s - side1)*(s-side2)*(s-side3)) After the line containing the keyword implementation, provide definition of all the subprograms. Right after the function declarations, write the word implementation, which is again a keyword. After this line, you will write the declarations for all the functions and procedures that will come in this unit. The next line should consist of a single keyword interface. So, our unit calculateArea will be saved in a file named calculateArea.pas. The name of the file and the name of the unit should be exactly same. For example −įollowing are three important steps in creating a Pascal unit − The first line of this file should start with the keyword unit followed by the name of the unit. To create a unit, you need to write the modules or subprograms you want to store in it and save it in a file with. It is the same program we used right at the beginning of the Pascal tutorial, compile and run it to find the effects of the change. Writeln('Press any key when you are ready') Writeln('a, b, c are sides of the triangle') Writeln('This program calculates area of a triangle:') Gotoxy(30, 4) (* takes the pointer to the 4th line and 30th column) Textcolor(green) (* text color is green *)
Textbackground(white) (* gives a white background *) The following example illustrates using the crt unit −
#FREE PASCAL 3.0.0 HOW TO#
However, let us first see how to include a built-in unit crt in your program − This tutorial explains creating and including user-defined units. We have already used the variants unit in Pascal - Variants tutorial. Using Built-in Unitsīoth the built-in units and user-defined units are included in a program by the uses clause. There are many built-in units in Pascal and Pascal allows programmers to define and write their own units to be used later in various programs. A unit might consist of some code blocks, which in turn are made up of variables and type declarations, statements, procedures, etc. A Pascal program can consist of modules called units.
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