title: Invalid operands to binary expression ('const char*' and 'const char *')
body: <p>I want to know the reason for this error in EASY words please. </p>
  
  <pre><code>#include &lt;iostream&gt;
  #include &lt;string&gt;
  
  int main()
  {
      std::string exclam = "!";
      std::string message = "Hello" + ", world" + exclam;
  
      std::cout &lt;&lt; message &lt;&lt; std::endl;
  
      return 0;
  }
  </code></pre>
  
  <blockquote>
    <blockquote>
      <p>test.cpp:55:35: error: invalid operands to binary expression ('const char *' and 'const char *')
          std::string message = "Hello" + ", world" + exclam;</p>
    </blockquote>
  </blockquote>