title: how to generate flowchart from C code using doxygen
body: <p>I'm new to Doxygen, 
  I have few doubts regarding this- </p>
  
  <ol>
  <li>Can we generate flowchart from C code using Doxygen?</li>
  <li>If yes, Is there any plugin required? Actually i installed GraphViz for CallGraph.</li>
  <li>If any relevant link for generating flowchart using Doxygen please share here?</li>
  <li>If No, Is there any tool will generate both documentation as well as flowchart using C code?</li>
  </ol>
  
  <p>Please answer me if you know.
  Thanks in advance.</p>