title: How to know value in the std::string/Cstring is number or not
body: <p>I am getting command line argument when i launch the application.
  I am getting four parameter from command line. </p>
  
  <p>after parsing I store them in four std::string/CString(mfc)  variable now i need to know whether the value is decimal or not.because these parameter is going to be used in some mathematical calculation.</p>
  
  <p>Can anybody help me on this.</p>