HTW Code Edition

Welcome to HTW Code Edition — a beginner-friendly bug-fixing challenge for first-year programmers.

Your task is to inspect each program, reproduce its incorrect behaviour, identify the bug, and submit a fix. The source files intentionally contain bugs. They are not examples of correct solutions.

Challenge rules

1. Open the GitHub Issue linked below for your challenge.
2. Read the expected behaviour and reproduce the problem using the provided example.
3. Fix the program while keeping the intended behaviour and input/output format.
4. Test normal cases and edge cases.
5. Submit your fix according to the event organiser's instructions. Do not post solutions publicly while the event is running.

Please do not publish solutions or spoilers in issue comments. Ask for hints in the issue if needed.

Challenges

C

Issue	File	Difficulty	Points
Issue #1 — Sum of Numbers	C/01-sum-of-numbers.c	Easy	5
Issue #2 — Even or Odd	C/02-even-or-odd.c	Easy	5
Issue #3 — Largest of Three	C/03-largest-of-three.c	Medium	10
Issue #4 — Multiplication Table	C/04-multiplication-table.c	Easy	5
Issue #5 — Count Positive Numbers	C/05-count-positive-numbers.c	Medium	10
Issue #6 — Grade Calculator	C/06-grade-calculator.c	Medium	10

Python

Issue	File	Difficulty	Points
Issue #7 — Number Guessing	Python/01-number-guessing.py	Medium	10
Issue #8 — Simple Calculator	Python/02-simple-calculator.py	Easy	5
Issue #9 — Countdown Counter	Python/03-countdown-counter.py	Easy	5

Running the programs

C programs can be compiled with GCC:

gcc C/01-sum-of-numbers.c -o challenge
./challenge

Run a Python program with Python 3:

python3 Python/01-number-guessing.py

Choose the matching file for the issue you are working on. Each issue contains a reproduction example and the expected behaviour, but not the solution.

Labels and scoring

Each issue carries one difficulty label and one points label:

• difficulty:easy or difficulty:medium
• points:5 or points:10

Have fun, test carefully, and happy debugging!