title: How to compile a lex file on windows?
body: <p>I have correctly downloaded and installed flex, bison and Dev C++ in C:\ . Then I tried to compile myfile.l in command prompt, but it gives the error:</p>
  
  <blockquote>
    <p>flex: can't open myfile.l.</p>
  </blockquote>
  
  <p>What is the problem?</p>