plane.cpp

来自「数据结构与程序设计教材源码 数据结构与程序设计教材源码」· C++ 代码 · 共 78 行

 
Plane::Plane(int flt, int time, Plane_status status)
/*   
Post:  The Plane data members flt_num, clock_start,
and state are set to the values of the parameters flt,
time and status, respectively.
 */

{
   flt_num = flt;
   clock_start = time;
   state = status;
   cout << "Plane number " << flt << " ready to ";
   if (status == arriving)
      cout << "land." << endl;
   else
      cout << "take off." << endl;
}
 
Plane::Plane()
/*   
Post:  The Plane data members flt_num, clock_start,
state are set to illegal default values.
 */

{
   flt_num = -1;
   clock_start = -1;
   state = null;
}
 
void Plane::refuse() const
/*   
Post: Processes a Plane wanting to use Runway, when
the Queue is full.
 */

{
   cout << "Plane number " << flt_num;
   if (state == arriving)
      cout << " directed to another airport" << endl;
   else
      cout << " told to try to takeoff again later" << endl;
}
 
void Plane::land(int time) const
/*   
Post: Processes a Plane that is landing at the specified time.
 */

{
   int wait = time - clock_start;
   cout << time << ": Plane number " << flt_num << " landed after "
        << wait << " time unit" << ((wait == 1) ? "" : "s")
        << " in the landing queue." << endl;
}
 
void Plane::fly(int time) const
/*   
Post: Process a Plane that is taking off at the specified time.
 */

{
   int wait = time - clock_start;
   cout << time << ": Plane number " << flt_num << " took off after "
        << wait << " time unit" << ((wait == 1) ? "" : "s")
        << " in the takeoff queue." << endl;
}
 
int Plane::started() const
/*   
Post: Return the time that the Plane entered the airport system.
 */

{
   return clock_start;
}