[PASCAL] Hello World

[PresidenT AnaS]

Today we have new type of Pascal which is called "Hello world".

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 −

1| Program name

2| Uses command

3| Type declarations

4| Constant declarations

5| Variables declarations

6| Functions declarations

7| Procedures declarations

8| Main program block

9| Statements and Expressions within each block

10| 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 −

program {name of the program}
uses {comma delimited names of libraries you use}
const {global constant declaration block}
var {global variable declaration block}

function {function declarations, if any}
{ local variables }
begin
...
end;

procedure { procedure declarations, if any}
{ local variables }
begin
...
end;

begin { main program block starts}
...
end. { the end of main program block }

Pascal Hello World Example

Following is a simple pascal code that would print the words "Hello, World!":

program HelloWorld;

uses crt;

(* Here the main program block starts *)
begin
writeln('Hello, World!');
readkey;
end.

 

This will produce following result −

Hello, World!

[PresidenT AnaS]

TC