AS-level CS Pseudocode

Every lesson runs in your browser — write real code, press Run, and the tasks check themselves. Free, no account needed, with notes in English and Chinese.

Start the course

Lessons in this course

1. 01 OUTPUT and sequence
2. 02 Variables and DECLARE
3. 03 Types and constants
4. 04 Arithmetic, DIV and MOD
5. 05 Selection: IF
6. 06 Selection: CASE
7. 07 Iteration: FOR
8. 08 Iteration: WHILE and REPEAT
9. 09 String handling
10. 10 1-D arrays
11. 11 2-D arrays
12. 12 Procedures and BYREF
13. 13 Functions
14. 14 Records
15. 15 Text files
16. 16 Putting it together

Language reference

/know/reference/pseudocode