Now just run the program ( through the command prompt itself). And generates a executable named a.exe (To use a different name, change last command to ' gcc lex.yy.c y.tab.c -o nameofexecutable.exe' ) Note that the final step compiles the C files generated by FLEX and BISON. Now in the CMD prompt, navigate to the folder where the exp.l and exp.y files are and run the following commands:Īt each step, assuming all is well, you won't get any output. Similarly create a YACC file as well, say 'exp.y' and edit it as followsĮVEN That's it! You now have a Bison and Flex set up! Now for some coding! :)Ĭreate a Lex file, let's say 'exp.l' and open it up in your favorite text editor (read: Notepad++) If you do not get the output as above, restart your system and try again. Warranty not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.Ĭopyright (C) 2004 Free Software Foundation, Inc. This is free software see the source for copying conditions.

Written by Robert Corbett and Richard Stallman.Ĭopyright (C) 2008 Free Software Foundation, Inc. You will have to add ' C:GNUWin32bin C:CodeBlocksbin' to the end of your PATHĦ) Open up a CMD prompt and type in the following Incase you don't know how to go about this, see how to do it on Windows XP ,Windows Vista and Windows 7. I use ' C:GNUWin32' for FLEX and BISON and ' C:CodeBlocks' for Code::Blocksĥ) Now add the BIN folders of both folders into your PATH variable.

It's recommended to install in folders WITHOUT spaces in their names.

I recommend DevCPP or Code::BlocksĤ) Install all 3. Here's how to set up FLEX and BISON on Windows systemsģ) Download a C/C++ Compiler ( If you say TurboC, I'll reach out through the monitor and thump your head). Sticking with the ' When in doubt, try another hole' philosophy, I just googled around a little and came up with a much easier solution. NOTE: When people say they use LEX and YACC, almost always, what they mean is FLEX (Which is an alternative to Lex) and BISON (which is part of the GNU project) / BYACC respectively. In many cases, people actually downloaded entire distro DVDs just for LEX/YACC! Since LEX and YACC are both originally developed for the *nix OSes ( read: Linux), there was a sudden rush of classmates downloading linux distros (Fedora being the default choice as it's used on lab systems). We've just started compiler design as part of the Language Translators subject at college and a practical aspect of it involves using LEX and YACC for Grammar Lexical Analysis and Parser Generation.

Lex compiler online