title: Using an int variable in system() function c++
body: <p>I need using an int veriable in system() function for my c++ program.
  for example:</p>
  <ul>
  <li>int a = 0;</li>
  <li>system(&quot;echo &quot;a&quot; &quot;);</li>
  </ul>
  <p>but i get an error and i need help about how i use this like that
  Error:
  C++ user-defined literal operator not found</p>