Tutorials & Books
Video Tutorials

Visual Prolog Features

Visual Prolog represents the latest generation of the Visual Prolog logical programming language, tailored for robust application development on the Microsoft Windows platform.

Language Features

Visual Prolog is a strongly typed, multi-paradigm programming language based on Prolog. Its main characteristics include:

Knowledge-Based Functionalities

Visual Prolog's integration of object-oriented programming, algebraic data types, fact databases, and non-deterministic rule-based logical programming makes it ideal for seamlessly incorporating knowledge-based functionalities. These functionalities encompass diagnostics, recommendations, decision support, expert systems, and natural language understanding capabilities.

Memory Safety

The combination of strong type checking, the absence of pointer arithmetic, and automatic memory management in Visual Prolog effectively eliminates access violations, enhancing program stability.

Human-Readable and Machine-Parsable Data

In Visual Prolog, all data types, excluding predicate values and objects, employ human-readable textual representations that can be comprehended both by humans and programmatically. This facilitates effortless data input, serialization, and programmatic data retrieval.

Integrated Development Environment (IDE)

Visual Prolog's IDE streamlines application development, especially for large projects. It offers features such as tree representation for organizing project items, a text editor for editing and navigation, navigation facilities for entity search and navigation, dialog and menu editors, a graphics editor for working with icons and bitmaps, and a build facility for inserting necessary packages and directives.


Visual Prolog's compiler is a powerful and efficient tool capable of creating standalone executables and DLLs. It performs numerous optimizations and sanity checks on the code.


The included linker can generate EXE and DLL files, leveraging LIB files from Microsoft Visual C compilers.


The built-in graphical debugger assists with memory, stack, and variable inspection, supporting standard debugging operations.


Visual Prolog includes a number of example projects that demonstrate various Visual Prolog features.

Including examples corresponding to the online tutorials; these are found in the _tutorials subdirectory in the examples directory.

See also

New features in .