title: 'ios' : is not a class or namespace name
body: <p>I am trying to write a matrix to a file with the above code. But i got the following error:
  'ios' : is not a class or namespace name. My code:</p>
  
  <pre><code>std::ofstream myfile;
  myfile.open ("C:/Users/zenitis/Desktop/bots/Nova/data/ownStatus.txt", ios::out | ios::app);               
  
  for (int i = 0; i&lt; 21; i++){
      myfile &lt;&lt; featureMatrix[i] &lt;&lt; "          ";
  }
  myfile &lt;&lt; "\n";
  myfile.close();
  </code></pre>
  
  <p>Any idea about this problem??</p>