title: duplicate symbol error C++
body: <p>I have added some const character in my file as under. The error i get  is duplicate symbol _xyz(say). What is the problem with it and how could i get out of this.</p>
  
  <pre><code>const char* xyz = "xyz";
  class Abc
  {
  public:
      Abc()
      {
      }
  };
  </code></pre>