A small JFlex+Cup example

It comes from a short article series in the Linux Gazette by Richard
A. Sevenich and Christopher Lopes, titled "Compiler Construction
Tools". The article series starts at

http://www.linuxgazette.com/issue39/sevenich.html

Small changes and updates to newest JFlex+Cup versions by Gerwin Klein


To compile:
>jflex lcalc.flex
>java java_cup.Main < ycalc.cup
>javac Main.java

To run:
>java Main test.txt


Files:

Main.java       demo of a main program
Makefile        makefile to compile and test the example
README          this file
lcalc.flex      the lexer spec
output.good     how the output should look like for the test
ycalc.cup       the parser spec
test.txt        sample input for testing

