Icon Online Compiler / Interpreter
Write and run Icon programming language code online directly from your browser with our free Online Icon Compiler / Interpreter. Practice goal-directed evaluation, string scanning, text processing, procedures, and control structures without installing an Icon interpreter or configuring a local development environment.
How to Use This Icon Compiler
- Write or paste your Icon code
Enter your program in the Code Editor. You can test strings, expressions, procedures, loops, generators, pattern-oriented logic, and other Icon features supported by the execution environment. - Click the Run button
Select Run to execute your Icon program. If the code contains a syntax or runtime error, review the returned feedback, correct the relevant statement, and run it again. - Check the Output screen
Your program result appears in the Output panel. Use the available controls to copy, download, or delete the output before testing another Icon program.
Key Features
- Free Online Icon Compiler / Interpreter: Write and execute Icon code directly from a modern web browser.
- Zero Installation: No need to install a local Icon interpreter or configure a separate runtime for supported programs.
- Instant Execution: Click Run and quickly view program output or execution feedback.
- Goal-Directed Evaluation: Experiment with expressions that can succeed, fail, and generate alternative results.
- String Scanning: Practice Icon’s string-processing and text-search capabilities.
- Generators and Sequences: Test expressions that can produce multiple values during evaluation.
- Dark and Light Mode: Switch the Code Editor theme for comfortable coding in different environments.
- Output Controls: Copy, download, or clear generated output directly from the Output panel.
1. How do I print output in the Icon programming language using write()?
Icon commonly uses write() to display text or values followed by a newline.
You can also print variables:
Enter the code in the Code Editor, click Run, and view the result in the Output screen.
2. What is goal-directed execution in Icon?
Goal-directed evaluation means an Icon expression can succeed, fail, or generate additional possible results. This allows programs to express searching and backtracking-style logic compactly.
For example:
The expression 1 to 5 generates several values, and every processes each generated result.
This programming model is one of Icon’s distinctive features and is especially useful for search-oriented and text-processing tasks.
3. Do I need to install an Icon virtual machine or interpreter on my computer?
No. You can use this Online Icon Compiler / Interpreter directly through your browser without installing a local Icon environment for supported programs.
A local setup may still be useful for larger projects, implementation-specific libraries, file-heavy workflows, debugging, or applications that require unrestricted access to your operating system.
4. Is Icon mainly used for string and text processing?
Icon is a general-purpose programming language, but it is especially well known for string processing, pattern-oriented programming, generators, and goal-directed evaluation.
A simple string-processing example is:
You can also experiment with string scanning and generated matches:
These features make the online Icon environment useful for computer science students, text-processing learners, and programming-language enthusiasts who want to explore a different approach to searching and symbolic processing.