// stowatch.h           stopwatch class#ifndef stowatch_h#define stowatch_h            #include <sys/types.h>#include <sys/timeb.h>class Stopwatch {      timeb starttime, stoptime;      enum watchstate { undefined, halted, running} state;    public:      Stopwatch() { state = undefined;}      void start();      void stop();      double duration();};#endif// end of stowatch.h