Learn Prolog - 10 Code Examples & CST Typing Practice Test
Prolog (Programming in Logic) is a high-level, declarative programming language focused on logic programming and symbolic reasoning. It is widely used in artificial intelligence, natural language processing, and rule-based systems, enabling developers to express knowledge and relationships rather than step-by-step instructions.
Learn PROLOG with Real Code Examples
Updated Nov 20, 2025
Learning Path
Learn syntax of facts, rules, and queries
Practice recursion and list handling
Build small logic puzzles
Explore constraint logic programming
Develop AI or expert system prototypes
Skill Improvement Plan
Week 1: Facts, rules, and queries
Week 2: Recursion and list operations
Week 3: Constraint logic programming
Week 4: Build small AI/expert system projects
Interview Questions
What is backtracking in Prolog?
Explain difference between facts and rules.
How does unification work?
What are Horn clauses?
How do you handle recursion and termination?
Cheat Sheet
fact(example).
rule(X) :- condition1(X), condition2(X).
?- query(X).
Lists: [Head|Tail]
Trace execution with trace/0
Books
Programming in Prolog by W. F. Clocksin & C. S. Mellish
The Art of Prolog
Prolog Programming for Artificial Intelligence
Learn Prolog Now!
Logic Programming and AI applications
Tutorials
Prolog for beginners
Logic programming and AI tutorials
Constraint logic programming
Natural language processing with Prolog
Expert systems development
Official Docs
SWI-Prolog Reference Manual
ISO Prolog Standard
GNU Prolog Documentation
Community Links
SWI-Prolog forums
StackOverflow Prolog tag
Reddit r/prolog
GitHub Prolog projects
Academic AI research communities
Community Support
SWI-Prolog forums
StackOverflow Prolog tag
Reddit r/prolog
GitHub Prolog projects
AI research communities
Frequently Asked Questions about Prolog
What is Prolog?
Prolog (Programming in Logic) is a high-level, declarative programming language focused on logic programming and symbolic reasoning. It is widely used in artificial intelligence, natural language processing, and rule-based systems, enabling developers to express knowledge and relationships rather than step-by-step instructions.
What are the primary use cases for Prolog?
Expert systems and rule-based AI. Natural language processing. Automated theorem proving. Knowledge representation and reasoning. Constraint logic programming
What are the strengths of Prolog?
Concise expression of complex logic. Ideal for symbolic reasoning. Automatic search and inference. Supports rapid prototyping of AI systems. Good for teaching logic programming concepts
What are the limitations of Prolog?
Not ideal for numerical computation or low-level tasks. Performance can degrade on large datasets. Less mainstream than procedural or object-oriented languages. Debugging can be challenging due to implicit control flow. Limited standard library for modern applications
How can I practice Prolog typing speed?
CodeSpeedTest offers 10+ real Prolog code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.