Pascal

Pascal is a strongly typed imperative and procedural programming language. Object Pascal extensions power Free Pascal Compiler (FPC) and Lazarus, enabling high-performance, cross-platform software development with readable syntax and fast compilation times.

Installation

The primary compiler implementation on Linux is the Free Pascal Compiler (FPC).

Option 1: Installing Free Pascal Compiler (FPC)

Install the compiler binaries and base standard units via Ubuntu's APT package repository:

apt update
apt install -y fp-compiler fp-units-base

Option 2: Installing Text IDE and Lazarus

To install the full FPC suite including the terminal-based IDE:

apt update
apt install -y fp-ide fpc

To install the graphical Lazarus IDE (RAD development system):

apt update
apt install -y lazarus

Verification

Verify that fpc is installed correctly by querying its version string:

fpc -iV

Writing and Compiling Code

Writing a Pascal Program

Create a source file named hello.pas:

program Hello;
begin
  writeln('Hello, World from Pascal in TIDE!');
end.

Compiling and Running with FPC

Compile the program into a standalone native binary:

fpc hello.pas
./hello

Object Pascal Mode and Optimizations

Compile using Object Pascal syntax mode (-Mobjfpc) with level 3 optimization (-O3):

fpc -Mobjfpc -O3 hello.pas
./hello

Official Resources

• Official Website