Day 21/90: Practice - Library management system
90 Day C++ Challenge: Zero to Production
Today I wanted library management system to feel like a real engineering decision, not a syntax demo. The useful shift was using practice - library management system to keep a larger C++ system understandable under change.
The checks that mattered were domain boundaries, dependencies that point the right way, and failure paths designed as early as the happy path.
The failure mode I was actively trying to avoid was spreading workflow rules across components without a clear ownership model. Practice days are where library management system stops being theory. I wanted a version that could survive one more requirement without collapsing into copy-paste fixes.
That is the bar I want from this track: code that stays readable when requirements move, not just code that compiles today. I also want to keep tracing one concrete path through the code because that exposes weak assumptions faster than a larger demo.
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