Topic 2. Data types, variables, operations, console input/output, and control flow constructs

Goal: learn to validate console input, select types, and build branches and loops with predictable boundaries.

Lecture contents

1. Types, variables, and conversions — Values and variable declarations · Primitive types and ranges · Conversions and overflow
2. Operations and console input — Operations and logical conditions · Console input and locale
3. Branching: if and switch — if and the switch expression
4. Loops and invariants — Loops and computation state · Invariants, boundaries, and test cases

Practice and review

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