title: Is "else if" a single keyword?
body: <p>I am new to C++. I often see conditional statement like below:</p>
  
  <pre><code>if 
    statement_0;
  else if
    statement_1;
  </code></pre>
  
  <p>Question:</p>
  
  <p><strong>Syntactically</strong>, shall I treat <code>else if</code> as a single keyword? Or is it actually an nested <code>if</code> statement within the outer <code>else</code> like below? </p>
  
  <pre><code>if 
    statement_0;
  else 
    if
      statement_1;
  </code></pre>