title: Dev-C++ Hello world doesn't show
body: <p>I am new to C++. I downloaded and run Dev-C++ and I write and run F9 this:</p>
  
  <pre><code>#include &lt;iostream&gt;
  using namespace std;
  
  int main()
  {
     cout &lt;&lt; "Hello, world!";
     return 0;
  }
  </code></pre>
  
  <p>But no "Hello, world!" is printed, why?</p>