title: Eclipse CDT C++ error
body: <p>I have just installed Eclipse CDT  on my machine for developping C++ applications.</p>
  
  <p>I have created a new C++ project.  I have copied a cpp file.</p>
  
  <p>When I click the build button, the project compile without errors.</p>
  
  <p>However, I have a problem. The problem is that Eclipse tell me that there is many errors. For example Eclipse show that "using namespace std" is an error or that "#include " is an error.</p>
  
  <p>I don't know what is the problem with Eclipse because my file compile properly when i click the "build" button.</p>
  
  <p>Is there some settings that I did not set properly?</p>
  
  <p>Thanks!</p>