title: Unable to resolve identifier on netbeans
body: <p>I'm keep getting this "Unable to resolve identifier file" message on netbeans.
  I'm new in c and netbeans. 
  It was fine last night but somehow after rebooting my computer this message keep occurs.
  Here's a code. What would be the problem?</p>
  
  <pre><code>#include &lt;stdio.h&gt;
  #include &lt;stdlib.h&gt;
  #include &lt;string.h&gt;
  
  int main(int argc, char** argv) {
    char filename[] = "text.dat";
    char line[5];
    FILE *file = fopen(filename, "r");
    return 0;
  }
  </code></pre>