//
// test program for Request class and subclasses:  build an assortment 
//      of objects and, for each, (1) invoke its serviceRequest()
//      method and (2) print the result.
//
class TestRequest {

        //
        // ---- main ---------------------------------------------------
        //
        // no command-line arguments.
        //
        public static void main(String[] args) {

                Request[] reqs = new Request[] {
                        new ShowLocalTime(),
                        new FindRealRoots(1.0, 0.0, 1.0),
                        new FindRealRoots(1.0, -2.0, 1.0),
                        new FindRealRoots(1.0, 0.0, -1.0),
                        new ShowLocalTime() 
                } ;

                for (int i = 0 ; i < reqs.length ; i++) {
                        System.out.println("request:  " +  reqs[i]) ;
                        Object o = reqs[i].serviceRequest() ;
                        if (reqs[i] instanceof ShowLocalTime)
                                System.out.println("result:  " + o) ;
                        else if (reqs[i] instanceof FindRealRoots) {
                                double[] roots = (double[]) o ;
                                if (roots.length == 0) 
                                        System.out.println("result:  " +
                                                "no real roots") ;
                                else if (roots.length == 1) 
                                        System.out.println("result:  " +
                                                "repeated root " +
                                                roots[0]) ;
                                else 
                                        System.out.println("result:  " +
                                                "roots " + roots[0] +
                                                ",  " + roots[1]) ;
                        }
                }
        }
}