Topic 5. Methods: parameters, overloading, recursion

Goal: become familiar with declaring and calling C# methods, parameter passing, and overloading; learn to divide a program into methods and use ref and out parameters, optional and named arguments, and params; master recursive algorithms and memoization.

Lecture contents

1. Declaring methods — Why methods are needed · Method declarations · Expression-bodied methods and naming
2. Passing parameters — Passing parameters by value · ref, out, and in parameters · Optional parameters and named arguments · params parameters
3. Overloading and recursion — Method overloading · Returning multiple values · Recursion · XML comments
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