Lex Compiler Editor Online

Posted By admin  On 17.08.21

If you are installing Ubuntu (or any Linux based OS) on your system either through Virtual Box or by making your system Multi-Bootable, just to execute your Lex & Yacc programs; then you might be wasting your HDD space & your valuable time. You can easily skip this annoying process and run your programs in Windows OS without any hassles.

Here’s how you can do it:

Installing Softwares:
  1. Download Flex 2.5.4a
  2. Download Bison 2.4.1
  3. DownloadDevC++
  4. Install Flex at “C:GnuWin32“
  5. Install Bison at “C:GnuWin32“
  6. Install DevC++ at “C:Dev-Cpp“
  7. Open Environment Variables.
  8. Add “C:GnuWin32bin;C:Dev-Cppbin;” to path.


Compilation & Execution of your Program:

Ideone is an online compiler and debugging tool which allows you to compile source code and execute it online in more than 60 programming languages. How to use Ideone? Choose a programming language, enter the source code with optional input data. And you are ready to go! Dec 28, 2006 This is an online compiler for your flex applications.Without even installing a single component in your pc, you can just copy paste your code into the code area of this very site and see your swf will be created online. Give it a try, you will love it.

  1. Open Command prompt and switch to your working directory where you have stored your lex file (“.l“) and yacc file (“.y“)
  2. Let your lex and yacc files be “hello.l” and “hello.y“. Now, follow the preceding steps to compile and run your program.
    1. For Compiling Lex file only:
      1. flex hello.l
      2. gcc lex.yy.c
    2. For Compiling Lex & Yacc file both:
      1. flex hello.l
      2. bison -dy hello.y
      3. gcc lex.yy.c y.tab.c
    3. For Executing the Program
      1. a.exe

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