Yacc and Lex

Hey,

I have used yacc and lex equivalents in java but have a few questions about them in C++.

1. Where can I get these (Are they included in the g++ compiler)
2. Are they cross-platform?


Thanks

YACC as in Yet Another Compiler Compiler , this is program that automatically generates a parser based on specifications written in sytax similiar to BNF. Bison is its GNU equivalent. I happen o read one of my books and came across this, thats all i know, the book also has some examples in C.