Programming in Pascal: From simple Pascal programs to current desktop applications with Database DEV-PASCAL, LAZARUS AND PASCAL N-IDE

Introduction

This work is an overview of the evolution of language very dear to the author because she was the first to study at the time of her school study, Pascal.

In the opinion of many, this dated language still surprises us with modern development platforms such as Dev-Pascal, Delphi and Lazarus. In this book we focus first on Pascal in general and on the application of some simple addition and sorting programs in Dev-Pascal and then dedicate ourselves to a more complex platform that also allows the creation of visual applications with the insertion of Form integrated with the language Pascal, Lazarus.

Finally we are dedicated to the design and creation of databases and we integrate them into Lazarus applications.

With these notions you will be able to create Pascal programs and applications in Lazarus for the solution of the most varied problems.

Pascal evolution

From its origins to today

Pascal was born as a structured language to facilitate the teaching of programming languages ​​and spread in the seventies-eighties. Being a school language it is a structured language with a strict syntax, in which all variables must be declared in advance. Pascal is essentially characterized by a strong typing that over time has been overtaken by other more recent languages ​​such as javascript which is instead characterized by a weak typing where the variables do not necessarily have to be declared. Later other languages ​​derived from Pascal were created such as Turbo Pascal and Object Pascal.

In this work we will explain Pascal in general and some recent and free applications for developing Pascal programs such as Dev-Pascal and Lazarus using Object Pascal such as Borland's Delphi.

Pascal today

Today we cannot ignore the development of applications with a simple and effective user interface. The