Topic 4. Arrays and strings

Goal: become familiar with one-dimensional, rectangular, and jagged arrays in C# and the string type; learn to create, traverse, copy, and sort arrays and process strings using the Array, string, and StringBuilder classes; master common array-processing and text-parsing algorithms.

Lecture contents

1. One-dimensional arrays — One-dimensional arrays · Accessing elements · Traversing and copying arrays
2. The Array class and multidimensional arrays — The Array class · Rectangular and jagged arrays
3. Strings and formatting — Strings · String methods · String literals and formatting
4. StringBuilder, Unicode, and regular expressions — The StringBuilder class · Culture, Unicode, and regular expressions
5. 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