Day 18 — 2D Arrays, Virtual Envs, and the CSS Box Model

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📦 Day 18 — Arrays, Environments, and a Box Around Everything

Today felt sharp — focused and filled with stuff that really matters.

From sorting arrays in C++ to building Python environments the proper way, and finally understanding the CSS box model — it was a solid deep-work day.

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✅ What I Did

💻 C++ – 2D Arrays and Sorting

• Learned:

  • How to declare, initialize, and access 2D arrays

  • Nested loops for input/output

  • Practiced basic sorting algorithms like selection sort and bubble sort

• Tried small logic-based problems on arrays and matrix traversal

🐍 Python – venv and CLI Practice

• Created and activated virtual environments using:

  • python -m venv env

  • source env/bin/activate (Linux/Mac) or .\env\Scripts\activate (Windows)

• Learned how to:

  • Use pip inside venv

  • Run and test code from CLI efficiently

🌐 Web Dev – CSS Box Model

• Finally understood how margins, borders, padding, and content interact

• Practiced using box-sizing, border, and spacing techniques

• Made demo cards to visualize each layer of the box model

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🔗 GitHub Pushes

• cpp-practice/day18-2darray-sorting.cpp

• python-vault/day18-venv-cli.md

• web-dev-start/day18-css-box-model.html

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🧠 Reflections

Today wasn’t flashy — but it was real work.
And real work stacks up fast.

Felt in control today. Like I’m building a base that I’ll actually use.

That’s Day 18. Logged and done.