Topic 12. Operator overloading, indexers, and extension methods

Goal: become familiar with operator overloading, conversion operators, indexers, and extension methods in C#; learn to declare arithmetic and comparison operators consistently with Equals, create indexers with bounds checking, and extend built-in types with extension methods.

Lecture contents

1. Operator overloading — Operator overloading · Conversion operators
2. Indexers — Indexers
3. Extension methods — Extension methods
4. Examples and common mistakes — Example programs · Common mistakes

Practice and review

• Practice — 3 worked examples with complete code and output
• Tasks — 30 variants, each with tasks at three difficulty levels
• Summary — conclusions, self-check questions, and useful links