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By.S.U.Kalugalaarachchi . Z.E.O.  Mathugama .

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Pascal is a procedural programming language, designed in 1968 and published in 1970 by Niklaus Wirth and named in honor of the French mathematician Blaise Pascal.

Among the most amazing implementations of Pascal are:   Skype   Total Commander   Macromedia Captivate   Apple Lisa   Various PC Games   Embedded Systems

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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. 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 (;).

program HelloWorld; uses crt; (* Here the main program block starts *) begin 	writeln('Hello, World!'); 	readln; end.

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The  begin  statement of the main program block is where the program 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· 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

program HelloWorld; uses crt; (* Here the main program block starts *) begin 	writeln('Hello, World!'); 	writeln(‘ I am ready for pascal’) 	readln; end.

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In place of writeln, type write and see the difference.

Practise  1. Write a Pascal program to display the following text on the screen: ABC Publishing, Inc. - 23a, main street, picaso , Colombia

Introduction to Pascal

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