Question

its about in C++

You will implement a simple calendar application The implementation should include a class named Calendar, an abstract class named Event and two concrete classes named Task and Appointment which inherit from the Event class The Event Class This will be an abstract class. It will have four private integer members called year, month, day and hour which designate the time of the event It should also have an integer member called id which should be a unique id for the event. The id should start from zero and should increment by 1 for each new event generated. The event class should have a constructor that sets the event time (year, month, day and hour members) and should also have get methods for its private members. The event class will have a pure virtual function called print0 with the following prototype virtual void print0 const:; The Task Class This class will derive from the Event class. On top of the base class, it should have an extra private string member called taskname which includes the task to be performed. It should have a constructor, and set/get methods for its private member. Its print function should implement the print function of Event class which should print the taskname and event time in the following format: Task with id 20 at 10/02/2018, 12:00: Submit Homework The Appointment Class This class will derive from the Event class. On top of the base class, it should have an extra private string member called personname with whom the appointment is and a private string mermber place where the appointment will be. It should have a constructor and set/get methods for its private members. Its print function should implement the print function of Event class which should print the appointment details in the following format: Appointment with id 21 at 10/11/2018, 10:00: George Wilson, Istanbul Technical University The Calendar Class This class will be a container class for the Event objects. It will implement a linked list where each list element can be one of Task or Appointment objects. It should have the following methods: Event addEvent(int eventType, int year, int month, int day, int hour); Allocates a new event object, initializes it and adds the event to the end of the linked list. It returns a pointer to the allocated event. eventType is O for a Task and 1 for an Appointment. deleteEvent (int id); Removes the event with the given id from the list and deallocates the event object. The deleteEvent method will throw an "EventNotFound" string exception if the event to be deleted is not found in the event list void listEvents Lists the events in the list. For each event in the list, it should call the print function for that event. The listEvent method will throw a "ListEmpty" string exception if the event list is empty. void filterEvents(int year, int month); Lists the events that are scheduled in the given year and month. For each event, it should call the print function for that event. The filterEvent method will throw a "NoMatchingEvent string exception if the list doesn't have any matching events The exception handlers should print the corresponding error message from the exception to the screen The main function Implement a main function that does the following: 1. Adds 5 Task Events and 5 Appointment Events with various times to the calendar. Set the Task and Appointment details as you wish. 2. Lists all events in the calendar. 3. Deletes an appointment you wish from the calendar. 4. Filters and lists all events scheduled at a certain day you designate. 5. Demonstrates the three exceptions above.

Answer 1

Answer:

C++ code:

#include<iostream>
using namespace std;
int start_id=0;
class Event
{
private:
int year;
int month;
int day;
int hour;
int id;
public:
Event *next;
Event(int y,int m,int d,int h)
{
year=y;
month=m;
day=d;
hour=h;
id=start_id;
start_id++;
}
int getId()
{
return id;
}
int getYear()
{
return year;
}
int getMonth()
{
return month;
}
int getDay()
{
return day;
}
int getHour()
{
return hour;
}
virtual void print()=0;
};
class Task:public Event
{
private:
string taskname;
public:
Task(string t,int y,int m,int d,int h):Event(y,m,d,h)
{
taskname=t;
}
void setTaskname(string t)
{
taskname=t;
}
string getTaskname()
{
return taskname;
}
void print()
{
cout<<"Task with id "<<getId()<<" at "<<getDay()<<"/"<<getMonth()<<"/"<<getYear()<<", "<<getHour()<<":00:"<<endl;
cout<<taskname<<endl;
}
};
class Appointment:public Event
{
private:
string personname;
public:
Appointment(string p,int y,int m,int d,int h):Event(y,m,d,h)
{
personname=p;
}
void setPersonname(string p)
{
personname=p;
}
string getPersonname()
{
return personname;
}
void print()
{
cout<<"Appointment with id "<<getId()<<" at "<<getDay()<<"/"<<getMonth()<<"/"<<getYear()<<", "<<getHour()<<":00:"<<endl;
cout<<personname<<endl;
}
};
class Calendar
{
private:
Event *head;
public:
Calendar()
{
head=NULL;
}
Event *addEvent(int eventType,string name,int year,int month,int day,int hour)
{
Event *temp;
if(eventType==0)
{
temp=new Task(name,year,month,day,hour);
}
else if(eventType==1)
{
temp=new Appointment(name,year,month,day,hour);
}
temp->next=NULL;
if(head==NULL)
{
head=temp;
return temp;
}
Event *p=head;
while(p->next!=NULL)
p=p->next;
p->next=temp;
return temp;
}
void deleteEvent(int id)
{
try
{
Event *p=head;
Event *q=NULL;
if(head->getId()==id)
{
head=p->next;
delete p;
cout<<"Deleted event with id="<<id<<endl;
return;
}
while(p->getId()!=id)
{
q=p;
p=p->next;
if(p==NULL)
break;
}
if(p==NULL)
{
string c="Event not found\n";
throw c;
}
else
{
q->next=p->next;
delete p;
cout<<"Deleted";
return;
}
}
catch(string c)
{
cout<<c;
return;
}
}
void listEvents()
{
try
{
if(head==NULL)
{
string s="ListEmpty\n";
throw s;
}
Event *temp=head;
while(temp!=NULL)
{
temp->print();
temp=temp->next;
}
}
catch(string s)
{
cout<<s;
}
}
void filterEvents(int year,int month)
{
try
{
int c=0;
Event *temp=head;
while(temp!=NULL)
{
if(temp->getYear()==year&&temp->getMonth()==month)
{
temp->print();
c++;
}
temp=temp->next;
}
if(c==0)
{
string s="No matching event\n";
throw s;
}
}
catch(string s)
{
cout<<s;
}
}
};
int main()
{
Calendar c;
c.addEvent(0,"Eat",2018,9,11,12);
c.addEvent(0,"Bath",2019,10,13,14);
c.addEvent(0,"Walk",2018,11,15,16);
c.addEvent(0,"Work",2019,12,17,18);
c.addEvent(0,"Mail",2019,1,19,20);
c.addEvent(1,"George",2018,2,21,22);
c.addEvent(1,"Sia",2019,3,23,1);
c.addEvent(1,"Katherine",2018,4,25,3);
c.addEvent(1,"John",2019,5,27,5);
c.addEvent(1,"Peter",2018,6,29,7);
c.listEvents();
cout<<endl;
c.deleteEvent(9);
cout<<endl;
c.filterEvents(2019,10);
cout<<endl;
//Now demonstrate 3 exceptions
c.deleteEvent(11);
c.filterEvents(2020,1);
for(int i=0;i<9;i++)
{
c.deleteEvent(i);
}
c.listEvents();
return 0;
}

output:

Task with id 0 at 11/9/2018, 12:00: Eat Task with id 1 at 13/10/2019, 14:00: ath ask with id 2 at 15/11/2018, 16:00: alk ask with id 3 at 17/12/2019, 18:00: ork ask with id 4 at 19/1/2019, 20:00: il intment with id 5 at 21/2/2018, 22:00: orge intment with id 6 at 23/3/2019, 1:00: Sia intment with id 7 at 25/4/2018, 3:00: Katherine intment with id 8 at 27/5/2019, 5:00: John Appointment with id 9 at 29/6/2018, 7:00: Peter Deleted Task with id 1 at 13/10/2019, 14:00: Bath Event not found o matching event leted event with id-0 leted event with id-1 leted event with id=2 leted event with id 3 leted event with id 4 leted event with id=5 leted event with id-6 leted event with id-7 leted event with id-8 istEmpty Program finished with exit code 0