title: How do I call a C function from a Perl program?
body: <p><code>test.c</code>:</p>
  
  <pre><code>int sum(int a, int b)
  {
      return (a+b);
  }
  </code></pre>
  
  <p><code>test.pl</code>:</p>
  
  <pre><code># how do I call sum here?
  </code></pre>