C Fundamentals

📁 Structure

c-fundamentals/
├── algorithms/
│   ├── sorting/          # Selection sort implementation
│   └── encryption/       # Caesar cipher with frequency analysis
├── systems/
│   └── sysinfo/          # Cross-platform system information
├── Makefile              # Unified build system
└── README.md

🛠️ Building

# Build all modules
make all

# Build specific module
make sorting
make encryption
make sysinfo

# Run tests
make test

# Clean build files
make clean

📦 Modules

Selection Sort (algorithms/sorting/)

# Interactive mode
./build/sorting

# With command-line arguments
./build/sorting banana apple cherry
# Output: ["apple", "banana", "cherry"]

Caesar Cipher (algorithms/encryption/)

# Encrypt with shift 3
./build/caesar-cli -e 3 "Hello World"
# Output: Khoor Zruog

# Decrypt
./build/caesar-cli -d 3 "Khoor Zruog"
# Output: Hello World

# Crack (frequency analysis)
./build/caesar-cli -c "Khoor Zruog"
# Output: Guessed shift: 3
#         Decrypted: Hello World

System Info (systems/sysinfo/)

# Basic info
./build/sysinfo

# Verbose (includes CPU, memory, user info)
./build/sysinfo -v

🔧 Technical Details

📚 Learning Goals

🔨 Development

# Clone
git clone https://github.com/hatimhtm/c-fundamentals.git
cd c-fundamentals

# Build and test
make test

# Install (optional)
sudo make install PREFIX=/usr/local

📄 License

👤 Author