Learn To Program with Pascal
4.5 (487 ratings)
Course Ratings are calculated from individual students’ ratings and a variety of other signals, like age of rating and reliability, to ensure that they reflect course quality fairly and accurately.
2,964 students enrolled

Learn To Program with Pascal

Master programming on Windows or Mac OS X with Lazarus & Free Pascal or Delphi
4.5 (487 ratings)
Course Ratings are calculated from individual students’ ratings and a variety of other signals, like age of rating and reliability, to ensure that they reflect course quality fairly and accurately.
2,964 students enrolled
Created by Huw Collingbourne
Published 10/2012
English [Auto]
Current price: $100.99 Original price: $144.99 Discount: 30% off
5 hours left at this price!
30-Day Money-Back Guarantee
This course includes
  • 5 hours on-demand video
  • 4 articles
  • 3 downloadable resources
  • Full lifetime access
  • Access on mobile and TV
  • Certificate of Completion
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What you'll learn
  • Cross-platform development with Lazarus on Mac, Windows or even Linux
  • Downloadable source code for Lazarus on Windows and Mac or Delphi on Windows
  • A 124-page eBook, The Little Book Of Pascal, explains all the topics in depth
Course content
Expand all 44 lectures 06:57:14
+ Getting Started
8 lectures 30:37
Welcome to Learn to Program with Pascal. This video provides a quick overview of the course.
Preview 06:14
The Little Book Of Pascal (eBook)
124 pages
Source Code Archive
Read Me First!
Before you begin you will need to have an Object Pascal compiler and an IDE (Integrated Development Environment) for your operating system. Here I explain where to download the free Lazarus IDE for Windows or OS X or the commercial Delphi IDE for Windows.
Installing the software

Using Lazarus, you can create a program, complete with its own user interface, in a matter of moments. Just follow along to write a ‘Hello world’ program.

Your first program: 'Hello world'

This video shows how to load one of the sample projects supplied with this course and run it inside the Lazarus IDE. It also highlights a few of the common code elements of Object Pascal programs.

Load and run a sample project
If you are wondering what all that code in a Pascal file actually does, this video should help to explain the basics. Here we take a quick first-look at Pascal code. I’ll explain the important elements in much greater detail later in this course.
Preview 08:54
+ Fundamentals of Pascal
3 lectures 18:13

Here we learn how to save the values of data items by assigning them to named ‘variables’.


Sometimes you may want to ensure that a value cannot be changed. That’s what ‘constants’ are for.


You can document your code by embedding comments. Here I show Pascal’s three alternatives comment types.

+ Procedures and Functions
4 lectures 35:32

Procedures and functions give you a way of dividing your code into named blocks for easy re-use. Here I explain the basics of procedures, functions and parameters.

Procedures And Functions

When you precede parameters with the var keyword in a procedure or function, the arguments are passed ‘by reference’; rather than ‘by value’. Here I explain what that means and why it is important.

Passing arguments by value and by reference

What is the difference between procedure myProcedure and procedure TForm1.myProcedure? Welcome to the world of object orientation. Here I take a first glance at ‘form methods’.

Form Methods

This tutorial shows an example of how a single procedure can do calculations for three different types of bank account. This illustrates the advantage of using procedures and functions to avoid repetition and keep your programs simple.

Sample program: calculating interest rates
+ Data Types, Operators and Scope
4 lectures 33:25

How to you subtract grapefruits from oranges or add 10 to a sonnet? These may sound like insoluble problems. But anything is possible if you make sure you are working with compatible data types.

Data Types

The compiler will check that the arguments you send to a procedure match the declared parameters in both number and type. This can save your program from encountering unexpected errors when it is run.

Parameters and type-checking

When you do arithmetic you’ll need to use operators such as +, -, *, /, div and mod. You can find out more about these in The Little Book of Pascal (the eBook supplied with this course) and in the demo program shown in this video. 

Arithmetic Operators

What is the difference between local and global scope and why does it matter? And a question: what happens when you declare two or more variables with the same name? The answer: It all depends on their scope!

+ Loops and Arrays
4 lectures 35:43

Here we find out how to repeat operations in Pascal. We start out with a for loop which lets us create a table of characters from their ASCII codes. If you want to follow along, be sure to run the ascii and ifelse projects froom the code archive.

'for' Loops

If you find that numerous if..else tests are making your code hard to understand, consider simplifying it with a case statement. This tutorial explains how…

Case Statements

for loops are fine when you know in advance how many times an operation needs to be repeated. Sometimes you may not know this, however, in which case the while and repeat loops can be used, as explained here.

'while' and 'repeat' loops

Here I explain how to create lists of items in the form of sequential arrays and how to iterate through the items in an array using a loop of find a single data item at a specific array index.

+ User-defined Types and File IO
4 lectures 34:46

We’ve used many standard types such as string and integer in our projects so far. You can also create your own types. This video explains how to do this and why it may be useful.

User-defined types

You can create complex data-types which, just like commercial database applications, wrap up multiple bits of data as the fields of a record. Here I show how to create a CD record type with fields to store the name, artist, price and label of a CD.


Using Free Pascal or Delphi IO procedures, you can read and write structured data to and from a file. Here I show how to save and load a file of CD records.

File IO

It is fairly easy to save and load text files using Delphi or Lazarus. Here I explain how to read and write characters and strings from a text file and display them in a memo or process the text and write it out to a new file. 

Saving and loading text files
+ Object Orientation
3 lectures 19:40

Here we take a first look at the principles Object Orientated Programming (OOP). I’ll explain how objects are created from classes and how they may form ‘family trees’ of ancestors and descendants.

Introduction to Object Orientation

Here I explain the difference between objects and records and show how to define a simple CD class, then create CD objects by calling the class’s ‘constructor’.

Classes and Objects

There are several ways to save and load objects to disk but none of them is as simple as saving and loading records. Here I show a simple trick that lets you save data from objects to a file of records.

Saving and Loading Objects
+ Class Hierarchies
6 lectures 41:26
Here we look at how to write your own ‘family tree’ of classes and how to initialize their data by writing constructors for each class.
How to create a class hierarchy

Even the forms and controls, such as Buttons and Memos are objects based on Delphi or Lazarus classes, as this lesson explains.

Forms and controls as Objects

When defining methods for Form classes or custom classes you need to enter both their definition and their implementation. Here I explain how a simple keystroke-combination can save you the trouble.

Code completion for classes
When two related classes have methods with the same name, how can you be sure that the correct method is used? Here we look at virtual and overridden methods and discover why destructors are overridden.
Virtual methods
Properties are not restricted to visual objects such as Buttons and Memos. You can also create properties for your own objects. Here I explain how to do this and why you might want to.
In the last video I showed how to define a write accessor or ‘setter’ property. here I’ll explain how to create a read accessor or ‘getter’ property.
Getter Properties
+ Exception-handling and Debugging
3 lectures 24:44
Exceptions are objects that wrap up errors that may occur when a program runs. Here I explain how to use exceptions to deal with unforeseen problems.
Sometimes the values of variables may be left in an uncertain state when an error occurs. Here I explain how you can use exception-handlers to ensure that critical variables are assigned meaningful values.
When your programs don’t do what you expect them to do, it’s time to use the debugger. The Delphi or Lazarus debugger can help you find and fix errors in your code. Here I show how to debug on Windows and OS X.
+ Going Further
5 lectures 19:07
The final sample project in this course is a text-based exploring game. This lets us revise many Object Pascal features and create a class hierarchy of game objects. 
Write an adventure game!
The adventure game introduces one important new feature: serialization. Using Object Pascal Stream classes I show how you can save and load complex networks of objects to and from disk.
Additional Resources
Now you’ve arrived at the end of this course, where do you go next? Here are a few ideas…
Going further...
And finally...

Simply the fastest way to learn to program on a Mac or Windows – either with the industry-standard Delphi system or with the free Lazarus and Free Pascal you can learn cross-platform programming the easy way. Just drag-and-drop, click and code!

This course will teach you the Object Pascal language, which is used not only by Lazarus but also by the well-established Delphi programming system. The knowledge you gain will give to entry to the world of commercial application development using Lazarus or Delphi.

What you will learn:

  • The fundamentals of programming – from the ground up
  • Object orientation – its principles and practice
  • The Object Pascal language – for neat, elegant, maintainable programming
  • Cross-platform development – for Windows, Mac or even for Linux

Who should take the course

  • Beginners – if you’ve never coded before, you can learn pascal step by step
  • This Pascal programming tutorial is also feasible for those Programmers who’ve used other languages – Ruby, Python or Java but want to extend their knowledge? This is for you!
  • Cross-platform developers – with Lazarus and Free Pascal, write on one OS, compile on a different one!