HOMEWORK 1 — Kotlin & Compose Basics
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Mobile Application Development | SUZA | Semester II 2025/2026
Weight: 10% | Individual work | Due: end of Week 4

PART A — Kotlin (40 pts)
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Submit one file "HomeworkA.kt".

1. (5 pts) Write fun celsiusToFahrenheit(c: Double): Double and test with
   0, 37, 100.

2. (10 pts) Write fun isPrime(n: Int): Boolean and
   fun primesUpTo(n: Int): List<Int>.

3. (10 pts) Define a sealed class Shape { Circle, Rectangle, Triangle }
   with properties. Add a function area(): Double for each using a
   "when" branch on Shape.

4. (15 pts) Given data class Expense(val category: String, val amount: Double),
   write extension functions on List<Expense>:
   - .total() : Double
   - .byCategory() : Map<String, Double>
   - .topCategory() : String?
   Include at least 6 sample expenses in main() and print all three.

PART B — Compose UI (60 pts)
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Build a single-Activity app "MyProfileCard" that displays a personal
profile card and 3 statistics.

Requirements (implement as separate Composables):
  1. ProfileHeader(name, title, imageRes) — circular avatar + name + title
  2. StatsRow(projects: Int, years: Int, languages: Int) — 3 metric tiles
  3. AboutSection(bio: String) — expandable section (tap to expand)
  4. LinksRow(email, phone, website) — 3 icons; click opens Intent (email, dial, URL)

The top-level ProfileScreen composes 1–4, wrapped in a Scaffold with a
TopAppBar titled "My Profile".

Grading:
  - Correct Compose usage, hoisted state, no UI state in wrong places (20)
  - Preview functions for each sub-composable (10)
  - Material 3 styling, proper spacing, works in dark mode (10)
  - Intents fired correctly on link clicks (10)
  - Clean code, meaningful names, Kotlin idioms (10)

SUBMISSION
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- Push to GitHub repo "mad-hw1-<studentid>"
- Include README.md with build instructions and 2 screenshots
- Submit the repo URL via Moodle before the due date