Flex, Bison, and C: Looking for a very basic introduction

Question

I am looking for a very short working example of flex and bison with an accompanying Makefile which makes use of the builtin rules. I\'ve tried several google results that were

Answer 1

The Bison documentation is perfect with a very good example of a calculator. I used it to start with bison. And the C++ example uses a flex scanner. It would be easy to make it in C.