title: Lexical analyser recognize 5abc as what kind of token ? or a error?
body: <pre><code>int main()
  {
      int a,b,c;
      5abc=20;
  }
  </code></pre>
  
  <p>Is <code>5abc</code> recognized as token?
  If yes then in which category would you place it?</p>
  
  <p>If No, then who is recognizing this error Lexical or Syntax analyser?
  Please explain.</p>