0c0cf6f5a4
* examples/c++/Makefile, examples/c++/calc++/Makefile, * examples/c++/glr/Makefile, examples/c/bistromathic/Makefile, * examples/c/calc/Makefile, examples/c/glr/Makefile, * examples/c/lexcalc/Makefile, examples/c/mfcalc/Makefile, * examples/c/pushcalc/Makefile, examples/c/reccalc/Makefile, * examples/c/rpcalc/Makefile, examples/d/calc/Makefile, * examples/d/simple/Makefile, examples/java/calc/Makefile, * examples/java/simple/Makefile: Use --html to generate *.html directly. No longer demonstrate --xml. No longer show rules for xml to html. Use --header, not --defines. Use --graph without specifying the output file now that we generate *.gv by default.
calc++ - A Flex+Bison calculator
This directory contains calc++, a Bison grammar file in C++. If you never saw the traditional implementation in C, please first read examples/c/lexcalc, which can be seen as a C precursor of this example.
Read the corresponding chapter in the documentation: "A Complete C++ Example". It is also available on line (maybe with a different version of Bison).
To use it, copy this directory into some work directory, and run make to
compile the executable, and try it. It is a simple calculator which accepts
several variable definitions, one per line, and then a single expression to
evaluate.
The program calc++ expects the file to parse as argument; pass - to read
the standard input (and then hit , control-d, to end your input).
$ ./calc++ -
one := 1
two := 2
three := 3
(one + two * three) * two * three
<Ctrl-d>
42
You may pass -p to activate the parser debug traces, and -s to activate
the scanner's.