title: Use of uninitialized value in sprintf
body: <p>I have a code like:</p>
  
  <pre><code>my ($line_1, $line2);
  </code></pre>
  
  <p>variables <code>$line_1</code> and <code>$line_2</code> are getting values from other function, that may be a <strong>defined or undefined</strong> value.</p>
  
  <p>Now I am getting an error like <code>" Use of uninitialized value"</code>  evenafter i have initialised like</p>
  
  <blockquote>
    <p>$line_1 = " " if(!$line_1);</p>
  </blockquote>
  
  <p>PLease help me in this</p>