Snail: I don't know if Lex and Yacc are going on. It seems that compiling white schools, hurry to make up the class: http://epaperpress.com/lexandyacc/
A Compact Guide to Lex & Yacc
This document explains how to construct a compiler using lex and yacc. Lex and yacc are tools used to generate lexical analyzers and parsers. I assume you can program in C, and understand data structures such as linked-lists and trees.
The Overview describes the basic building blocks of a compiler and explains the interaction between lex and yacc. The next two sections describe lex and yacc in more detail. With this background, we construct a sophisticated calculator. Conventional arithmetic operations and control statements, such as if-else and while, are implemented With minor changes, we convert the calculator into a compiler for a stack-based machine The remaining sections discuss issues that commonly arise in compiler writing Right-click on the following links for additional downloads...:
PDF Format (100K) Source Code for Calculator (5K)
Permission to reproduce portions of this document is given provided the web site listed below is referenced, and no additional restrictions apply. Source code, when part of a software project, may be used freely without reference to the author.
Thomas Niemannportland, OregonepaperPress.com
