title: 'iostream' file not found Xcode
body: <p>Whenever I try to use Xcode 11 to build C++ programs and type in the line: </p>
  
  <pre><code>#include &lt;iostream&gt;
  </code></pre>
  
  <p>An error saying "'iostream' file not found shows up. The library I am using is libc++ and not libstdc++.</p>
  
  <p>Other people dont seem to encounter this problem so I do not know what is going on. </p>
  
  <pre><code>#include &lt;iostream&gt;
  using namespace std;
  
  int main()
  {
      cout &lt;&lt; "Hey, this really works!" &lt;&lt; endl;
  }
  </code></pre>