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PEPrince Evans
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Work · 18 projects

Everything I've built.

Systems, tools, games and a thesis, almost all from scratch. 17,606 lines of code across my repos, and every project has its own page.

  1. 01 Command-line spreadsheetFeatured A spreadsheet engine in C with formulas, ranges and a dependency graph, built from scratch. C Jan – Mar 2025 3,364 lines
  2. 02 Sparse spreadsheet in RustFeatured The spreadsheet rebuilt in Rust with sparse storage. Recalculation went from minutes to seconds, and it runs in your browser. Rust Mar – May 2025 1,963 lines
  3. 03 Taylor-Line microswimmersFeatured A molecular-dynamics simulator for microswimmers in a shrinking space, about 61× faster with spatial hashing. C++ Jan – May 2026 2,195 lines
  4. 04 SimpleRISC interpreterFeatured Reads and runs SimpleRISC assembly. One C file, with an HTTP API on AWS. Run real programs below. C Jul – Aug 2024 2,721 lines
  5. 05 CodeBreakerFeatured A native iPhone Mastermind game in SwiftUI with 20+ themes and no dependencies. Swift 2026 704 lines
  6. 06 CodeWordBreaker CodeBreaker with real English words: guesses are checked against a word list. Swift 2026 497 lines
  7. 07 QELM logic minimizer Boolean function minimizer: exact Quine-McCluskey plus a multi-pass Espresso heuristic, reading PLA files. C++ 2025 785 lines
  8. 08 KMP visualiser Step through the Knuth-Morris-Pratt algorithm. The engine is C++ compiled to WebAssembly. C++ → WASM 2026 280 lines
  9. 09 E++ expression evaluator Arbitrary-precision arithmetic on huge integers and rationals, with a parse tree and a BST symbol table. C++ Oct – Dec 2023 1,176 lines
  10. 10 E++ compiler Compiles E++ statements into stack-machine commands, managing variable memory with a min-heap. C++ 2023 692 lines
  11. 11 Corpus Q&A tool Ranks paragraphs with TF-IDF, matches patterns with KMP and tries, then feeds the best context to an LLM. C++ Jan – Feb 2024 630 lines
  12. 12 Rollerball AI bot Minimax with alpha-beta pruning, tuned to move in 1–2 seconds in a timed tournament. C++ Mar – Apr 2024 offline
  13. 13 Document processing tool Trie-based word counts and Z-algorithm substring search over an indexed corpus. C++ 2024 396 lines
  14. 14 Banking framework One banking database, five hash-table strategies: chaining plus linear, quadratic and cubic probing. C++ 2024 1,236 lines
  15. 15 Image processing library CNN building blocks from scratch: FFT-based 2D convolution, pooling and activations. C++ 2024 516 lines
  16. 16 Library lending system Borrow and return simulation with a hand-written linked-list queue and pending list. Java 2024 333 lines
  17. 17 Simple Twitter A tiny Twitter in C++: post, follow, unfollow and a top-10 news feed from a heap. C++ 2025 75 lines
  18. 18 Guessing game in Rust My first Rust program: input handling, random numbers and control flow. Rust 2025 43 lines
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