Learn MODULA3 with Real Code Examples

Download a Modula-3 compiler (e.g., m3, DEC SRC compiler)

Install and configure compiler on system

Set environment variables for Modula-3 workspace

Verify installation with a simple test program

Ensure standard libraries and runtime are accessible

Install Modula-3 compiler (e.g., DEC SRC m3)

Set M3_PATH environment variable to library locations

Verify installation with test programs

Ensure runtime libraries are accessible

Test concurrency and exception features

source.m3 - main source file

lib/ - libraries and modules

bin/ - compiled executables

tests/ - validation scripts

docs/ - design and API documentation

m3c source.m3 - compile Modula-3 code

m3run executable - run compiled program

m3build project - build linked modules

m3test tests/ - run test suite

m3version - check compiler version

Supports Unicode via strings

Modules can handle localized resources

No standard i18n libraries

Text formatting handled in application modules

Locale awareness implemented per project

Limited; relies on external libraries

Modules can abstract accessibility features

Keyboard/mouse events handled manually

Text-based UIs easier to implement

Primarily academic or research accessibility focus

Modula-3 itself has no GUI standard

Custom GUI via X11 bindings or external libraries

Modular event-driven design recommended

GUI elements encapsulated in modules

Portable design via modular abstraction

Module-level variables encapsulated within modules

Object fields and methods manage state

Concurrent state managed via monitors

Garbage collection handles object lifecycle

Explicit state management for critical performance paths

Primitive types: INTEGER, REAL, BOOLEAN

Composite types: RECORDS, ARRAYS

Objects and classes for structured data

Exception and error data

Thread-safe shared resources via monitors