title: Can't compare strings/chars in insensitive cases (error - methods not found)
body: <p>I'm having problems with comparing two strings in case-insesitive way.
  I've tried lots of methods(functions) like <em>strcasecmp, stricmp, strcmpi, etc</em>. I had imported the libraries where those functions belong but still it can't seem to detect them.</p>
  <p>Here is my code:</p>
  <pre><code>#include &lt;bits/stdc++.h&gt;
  #include &lt;string.h&gt;
  #include &lt;cstring&gt;
  #include &lt;mem.h&gt;
  
  using namespace std;
  
  int main() {
  
    char s1[100], s2[100];
    cin &gt;&gt; s1;
    cin &gt;&gt; s2;
    cout &lt;&lt; strcasecmp(s1, s2) &lt;&lt; endl;
  
    return 0;
  }
  </code></pre>
  <ul>
  <li></li>
  </ul>
  <pre><code>ERROR: project.cpp|13|error: 'strcasecmp' was not declared in this scope
  </code></pre>
  <p>Does anybody have suggestions on how to fix it?</p>
  <p>Thank you.</p>