# Week 1 Progress Map — Updated to Day 4

## Student Profile

* Experience: Fullstack Web Developer (JavaScript, PHP, SQL, HTML, CSS, Python)
* Goals: System administration (Windows, Linux, macOS), hacking, algorithms, low-level programming
* Languages: C, Powershell, C#, Bash, SQL, C++, Python
* Current Focus: CompTIA A+ → CCNA → Security+

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## Week 1 Overview

* **Concept:** Variables, Conditionals, Loops, Functions, Scope
* **Goal:** Build foundation in core programming concepts, algorithmic thinking, input validation, and cross-language syntax comparison

### Day 1 — C

* Read user input
* Count characters in strings
* Enforce max length
* Validate first character via ASCII ranges
* Username validation: letters only, max length, starting letter

### Day 2 — Python

* Conditional logic: Even/Odd number check
* Count letters in a string
* Username validation implemented in Python
* Multiple username validation
* Runtime analysis (`T(n)` and `T(m, n)`) and time complexity

### Day 3 — SQL (PostgreSQL)

* Filter rows based on string length
* Select letters-only usernames using regex
* `CASE WHEN` to classify usernames as Accepted/Refused
* Aggregate valid usernames count
* Runtime analysis in SQL (`T(n, m) = n x m`) and scaling discussion

### Day 4 — PowerShell

* Conditional logic: `if / elseif / else`
* Loops: `foreach` over strings and arrays
* Input validation: letters only, max 20 characters, starts with letter, no spaces or digits
* Username validator script for single and multiple usernames
* Algorithm analysis: runtime `T(n, m) = n x m`, doubling users doubles execution
* Security perspective: safe and defensive scripting in PowerShell, Windows admin context

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## Completed Exercises Summary

* **Exercise 1:** Even/Odd number check (Python → PowerShell)
* **Exercise 2:** Count letters in string
* **Exercise 3:** Single username validation
* **Exercise 4:** Multiple usernames validation
* **Exercise 5:** Algorithm scaling explanation

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## Next Objectives (Week 1 Day 5)

* Learn **Bash scripting** for Linux sysadmin workflows
* Apply conditionals, loops, and input validation in Linux environment
* Translate Day 1–4 algorithms into Bash scripts
* Emphasize security and defensive programming

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## Recommendations

* Review regex patterns across languages (C, Python, SQL, PowerShell)
* Practice linear runtime analysis (`T(n, m)`) in each context
* Keep all scripts secure, avoid unsafe input handling
* Document differences in syntax and idioms between languages

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## Notes

* Student has strong programming background; focus can be on **systems, security, and algorithmic thinking**
* Real-world project orientation encouraged (username validation → real-world user input handling, audits, or security scripts)
* Progress map will continue tracking daily exercises, language-specific skills, and algorithmic awareness