title: Visual c++ project with multiple cpp files : _main is already defined
body: <p>i have several .h files and .cpp files that i've created using DOS c++ compilers.
  Now i want to use them in a Visual c++ project.
  I have included all my .h files.
  Now , when i have included my first cpp file , is working correctly.
  But when i have included my second .cpp file , and try to run  i've get an error : _main is already defined.</p>
  
  <p>What can i do ? I want ( !! don't know if possible !!) to have several .cpp file inside the same project and run them separately.</p>
  
  <p>Is this possible ? </p>