Tic-Tac-Toe — Optimized with Bitmasking
Context
Many beginner game projects tightly couple UI rendering, input parsing, and state management into one monolithic function — usually all inside main() — which makes the code hard to maintain or extend. The goal here was to architect a lightweight, modular turn-based game in standard C to practice clean separation of concerns, defensive input handling, and structured data encapsulation.
Implementation
- Separation of concerns: isolated the core game mechanics and rule validation (
game.h/game.c) from the application’s execution flow (main.c). - Deterministic state control: an event-driven main loop orchestrates the full game lifecycle — handling real-time player input, validating move legality against state bounds, checking win/draw conditions every tick, and toggling the current player.
- Low-level memory management: board state is bitmasked inside standard C structs rather than a naive array, avoiding dynamic allocation overhead and keeping execution deterministic and free of memory leaks.
Impact
- Performance: bitmask-based win-condition checks push toward constant-time complexity instead of scanning the board.
- Architectural foundation: a reusable boilerplate pattern for procedural state machines, extensible to other grid-based games or a graphical backend.
- Code quality: disciplined engineering practices — error recovery for invalid input, clean modularity — even within a constrained, low-level language.
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