Using Delphi’s Expressions Engine EXPR math parser library parsing evaluating expressions

https://blogs.embarcadero.com/using-delphis-expressions-engine/

https://github.com/torvalds/linux/blob/master/scripts/kconfig/expr.c 

https://beltoforion.de/en/muparser/

C++ Mathematical Expression Library (ExprTk) - By Arash

C library for parsing and evaluating simple expressions.

 evaluating  expressions

 https://stackoverflow.com/questions/1326258/mathematical-expression-parser-in-delphi

 https://github.com/Crownie88/Delphi-mathematic-expression-parser/blob/master/MathExpParser.pas