Qt_Bison_Flex_Calculator

A example , cq template how to implement Qt with Bison & Flex.

Origially example : https://github.com/destinyelings/qt-bison-flex Modified by Skynet Cyberdyne :

Added auto script instead of manually adding build steps.
Added a easy calculator example from : https://github.com/ckshitij/LEX-AND-YACC
Modified the MainWindow to use with calculator.

Things to keep in mind :

To create the connection between Qt & Bison/Flex on c-c++ level is quite a dramatic tour. This struct is used by common.h :
```
      scanner.h line 158:
      typedef struct yy_buffer_state *YY_BUFFER_STATE;
```

Result :

Install Bison & Flex :

wget https://github.com/grotius-cnc/Qt_Bison_Flex_Calculator/releases/download/1.0.0/bison_2.3a3.8.2+dfsg-1_amd64.deb
wget https://github.com/grotius-cnc/Qt_Bison_Flex_Calculator/releases/download/1.0.0/flex_2.6.4-8_amd64.deb
sudo dpkg -i bison_2.3a3.8.2+dfsg-1_amd64.deb
sudo dpkg -i flex_2.6.4-8_amd64.deb

Info bison :

mDepends: m4, libc6 (>= 2.29)
Suggests: bison-doc

Info flex :

Depends: libc6 (>= 2.26), m4
Recommends: gcc | c-compiler, libfl-dev
At some git repositories you will see the -lfl compile flag hanging around in the Qt.pro file, this will point to the libfl-dev.