codeplea/tinyexpr

Health v2 · maintenance only

Adoption not part of the score

1919 stars · 309 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

TinyExpr is a small recursive descent parser, compiler, and evaluation engine for math expressions in C. It ships as a single source and header file with no dependencies, supporting standard operators, C math functions, custom functions, and runtime variable binding.

Use cases

• evaluate math expressions at runtime in C
• add a calculator to my application
• parse user-entered formulas like sqrt(3^2+4^2)
• bind variables into math expressions at eval time
• embed a tiny expression evaluator in an embedded project
• support custom math functions in a formula parser

When to choose

• you need a tiny, dependency-free C library for evaluating math expressions
• you want a single-file solution that is easy to integrate and thread-safe
• you need runtime variable binding and custom function support

When to avoid

• you need symbolic math, algebra, or arbitrary-precision arithmetic
• you need a full expression language with strings, arrays, or control flow
• your project is not in C/C++ or a language with C interop

Facets

library · maturity stable

parser interpreter math developer-tools parsers c cpp embedded cross-platform expression-evaluator recursive-descent single-file calculator no-dependencies thread-safe algorithms

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