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https://github.com/erstan/ceval
Ceval is a C/C++ library for parsing and evaluation of math expressions. It is primarily written in C with a very small portion written in C++ that is included only when the #include directive is from a C++ file/project.
Math expressions consisting of floating point numbers (in decimal or exponential form), basic arithmetic operators, relational operators, logical operators and bitwise operators can be parsed using the ceval library. The expression can also contain single-argument[
f(x)
] and double-argument functions [f(x, y)
].