flex and bison calculator demonstrating polymorphism in the abstract syntax tree
The original code comes from "flex & bison". I though that I would implement the abstract syntax tree with a polymorphic class.
In order to build 'calc' from qt creator you'll need to add two custom build steps. One for bison and one for flex and in that order. These build steps have to happen before anything else. The command for bison is
bison -o parser.cpp -d parser.ypp
The command for flex is
flex -o lexer.cpp lexer.l
The working directory for both steps is
%{sourceDir}