title: copy a existing cpp file in C++
body: <p>This is a very basic question:
  I just want to copy a existing cpp file into a new empty project.</p>
  
  <p>I create a new <code>empty project</code> <code>Test</code>, then add a <code>existing item</code> <code>Main</code> from other folder, but the address of <code>Main</code> is still the original address and we can not see the <code>Main</code> under the <code>Test</code> folder. Even I copy the <code>Main</code> into the <code>Test</code> folder, the <code>Source file</code> can still not see the <code>Main</code> in the visual studio.</p>
  
  <p><a href="https://i.stack.imgur.com/vXdGl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vXdGl.png" alt="enter image description here"></a></p>