Turbo Pascal Sample Program

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Apr 14, 2017 Square a Number in Turbo Pascal Here is a sample program that will ask the user to give a number and then the program will convert the given number into it's square number equivalent using Pascal as our programming language.

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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.

Pascal Program Structure

A Pascal program basically consists of the following parts −

Program name
Uses command
Type declarations
Constant declarations
Variables declarations
Functions declarations
Procedures declarations
Main program block
Statements and Expressions within each block
Comments

Every pascal program generally has a heading statement, a declaration and an execution part strictly in that order. Following format shows the basic syntax for a Pascal program −

Pascal Hello World Example

Following is a simple pascal code that would print the words 'Hello, World!' −

This will produce following result −

Let us look various parts of the above program −

The first line of the program program HelloWorld; indicates the name of the program.
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. Fushigi no umi no nadia sub ita download.
The next lines enclosed within begin and end statements are the main program block. Every block in Pascal is enclosed within a begin statement and an end statement. However, the end statement indicating the end of the main program is followed by a full stop (.) instead of semicolon (;).
The begin statement of the main program block is where the program execution begins.
The lines within (*..*) will be ignored by the compiler and it has been put to add a comment in the program.
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 statement readkey; allows the display to pause until the user presses a key. It is part of the crt unit. A unit is like a library in Pascal.
The last statement end. ends your program.

Compile and Execute Pascal Program

Open a text editor and add the above-mentioned code.
Save the file as hello.pas
Open a command prompt and go to the directory, where you saved the file.
Type fpc hello.pas at command prompt and press enter to compile your code.
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.
Now, type hello at command prompt to execute your program.
You will be able to see 'Hello World' printed on the screen and program waits till you press any key.

Make sure that free pascal compiler fpc is in your path and that you are running it in the directory containing source file hello.pas.

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Pascal compiler and IDE (Integrated Development Environment) Turbo Pascal was developed by Borland which is later widely used among Pascal programmers. Turbo Pascal is the cheaper version of the advanced Borland Pascal which has a huge library and source code.
Turbo Pascal Features:
* Inheritance
* Static & dynamic objects
* Constructors and Destructors
* Object constants
* Compiles @ > 34,000 lines/minute
* New integrated environment tutorial
* Hypertext Help with copy & paste
* Enhanced SMART linker & Overlay manager
* Support for Intel 8087, 80287, 80387 math co-processors

Platforms: Windows , Windows 95/98

System requirements: Not specified

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