What you'll learn
How programs store collections of data.
Key ideas
- Arrays store multiple values; the index gives position (often from 0).
- Two-dimensional arrays have rows and columns.
- Records group related fields; files store data persistently.
Exam tips
- Remember indexing often starts at 0.
- Distinguish records from arrays.
Common mistakes
- Off-by-one index errors.
- Confusing fields and records.