practice

Small C++ exercises and experiments. Each program is standalone and can be compiled directly with a C++17 compiler (no build system included).

Requirements

• C++17 toolchain (clang++ or g++)
• Eigen 3.3+ (header-only) for practice/transformer.cpp

Quick build/run

# FizzBuzz
clang++ -std=c++17 -O2 practice/fizz.cpp -o fizz && ./fizz

# Rock / Paper / Scissors
clang++ -std=c++17 -O2 practice/roshambo.cpp -o roshambo && ./roshambo

Projects

practice/fizz.cpp

Classic FizzBuzz printing 1..10.

practice/roshambo.cpp

CLI Rock/Paper/Scissors against a RNG "robot".

practice/json-parser/

practice/json-parser/main.cpp is a small CLI that:

• Validates input (.jsonl or .csv, or - for stdin)
• Counts lines
• Prints a preview of the first N lines (default 5)

Build and run:

clang++ -std=c++17 -O2 practice/json-parser/main.cpp -o json-parser
./json-parser --help
./json-parser practice/json-parser/test.jsonl --preview 3
cat practice/json-parser/test.jsonl | ./json-parser - --preview=2

practice/corpus_stats/

Directory/file scanner that totals:

• files scanned
• total lines
• total bytes

Optional flags include recursion (-r/--recursive), extension filters (--ext .jsonl), error continuation (-c/--continue), and preview lines (--preview N).

Build and run:

clang++ -std=c++17 -O2 practice/corpus_stats/src/*.cpp \
  -I practice/corpus_stats/include -o corpus_stats

./corpus_stats --help
./corpus_stats practice/ -r --ext .cpp --preview 5

practice/transformer.cpp

A minimal transformer encoder block (multi-head self-attention + MLP) written with Eigen; it runs a small dummy example and prints the output shape.

Build and run (adjust the Eigen include path):

clang++ -std=c++17 -O3 -I /path/to/eigen3 practice/transformer.cpp -o transformer
./transformer

Contributing

If you spot a bug or want to add another small exercise, feel free to open an issue or PR. Please keep changes small and include a build/run example.

License

No repository-wide license is specified. Some files may include their own license headers (for example, practice/transformer.cpp).