C++ Basics

A small C++20 learning project that verifies my local C++ toolchain and includes a command-line IPv4 subnet calculator.

This repository verifies that a modern C++ workflow works correctly with CLion, CMake, Ninja, Apple clang++, Git, and GitHub on my Intel Mac setup.

Purpose

This is not intended to be a large C++ application. It is a compact baseline project for:

• verifying the local C++ toolchain
• practicing C++ fundamentals
• understanding compiled languages and build systems
• preparing for small command-line tools later on
• keeping a clean Git/GitHub workflow for C++ projects

C++ is a secondary technical skill in my current learning path. My main focus is data and process analysis, SQL, Python, BI, and Microsoft-oriented data tooling.

Tested Environment

• iMac Retina 4K, 21.5-inch, Late 2015
• Intel x86_64
• macOS Sonoma 14.8.7 via OpenCore Legacy Patcher
• CLion via JetBrains Toolbox
• Apple clang++ 16
• CMake 4.3.2
• Ninja 1.13.2
• C++20
• Git / GitHub

This repository also documents that the toolchain works on a legacy Intel Mac setup used as a stable learning and development machine.

Repository Structure

.
├── CMakeLists.txt
├── include/
│   └── subnet.h
├── src/
│   ├── main.cpp
│   └── subnet.cpp
├── README.md
├── LICENSE
├── .clang-format
├── .editorconfig
└── .gitignore

Build directories and local IDE metadata are intentionally excluded from Git:

.idea/
build/
cmake-build-debug/

Run in CLion

Open the project in CLion and run the cpp_basics configuration.

Program arguments:

192.168.10.42/24

Expected output:

Input IP:          192.168.10.42
CIDR prefix:       /24
Subnet mask:       255.255.255.0
Wildcard mask:     0.0.0.255
Network address:   192.168.10.0
Broadcast address: 192.168.10.255
Total addresses:   256
Usable hosts:      254
First usable host: 192.168.10.1
Last usable host:  192.168.10.254
Note:              Standard subnet with network and broadcast addresses excluded.

Build from Terminal

Configure the project:

cmake -S . -B build -G Ninja

Build the executable:

cmake --build build

Run the subnet calculator:

./build/cpp_basics 192.168.10.42/24

Expected output:

Input IP:          192.168.10.42
CIDR prefix:       /24
Subnet mask:       255.255.255.0
Wildcard mask:     0.0.0.255
Network address:   192.168.10.0
Broadcast address: 192.168.10.255
Total addresses:   256
Usable hosts:      254
First usable host: 192.168.10.1
Last usable host:  192.168.10.254
Note:              Standard subnet with network and broadcast addresses excluded.

What This Demonstrates

This repository demonstrates a working C++20 baseline setup using:

• a CMake-based project structure
• a small command-line IPv4 subnet calculator
• IPv4 parsing and validation
• CIDR prefix handling
• subnet mask and wildcard mask calculation
• network and broadcast address calculation
• basic bitwise operations in C++
• Ninja as build generator
• Apple clang++ as compiler
• CLion as the primary C++ IDE
• Git and GitHub for version control

Next Steps

Possible future additions:

• a simple CSV checker
• a logfile parser
• basic unit tests

Notes

This repository is intentionally small. Its purpose is to document and verify a clean C++ development setup before building larger tools.

No local build artifacts, IDE metadata, or machine-specific files are committed.