title: what is the meaning of dup('#') in assembly language
body: <p>e-g </p>
  
  <ol>
  <li>source BYTE "This is the source string",0</li>
  <li>target BYTE SIZEOF source DUP('#')</li>
  </ol>
  
  <p>what is the function of Dup('#') in this lines of code.</p>