title: How to deal with Warning C4100 in Visual Studio 2008
body: <p>For some reason my Visual Studio 2008 began to show warnings for code like: 
  "int main( int argc, char **argv)", which is really annoying. </p>
  
  <p>The detailed warning ouputs are (you can ignore the line numbers):<br>
  1>.\main.cpp(86) : warning C4100: 'argv' : unreferenced formal parameter<br>
  1>.\main.cpp(86) : warning C4100: 'argc' : unreferenced formal parameter</p>
  
  <p>I wonder if there are settings in Visual Studio 2008 that have been accidentally changed. Or how should I deal with this warning?</p>