public class Input1
{

   /* -------------------------------------------------------
      Pass information to method with parameter variable x
      ------------------------------------------------------- */
   public static double Square( double x )                
   {
      double out;

      out = x * x;          // x contains input information

      return(out);
   }

   public static void main( String[] args )
   {
      double a, b;

      a = 4.0;
      b = Square( a );   // The value in a is passed to the parameter var x

      System.out.println( b) ;
   }
}