Practical No: -7
Experiment No. 7: The ticket booking system of Cinemax theatre has to be implemented using C++
program. There are 10 rows and 7 seats in each row. Doubly circular linked list has to be maintained
to keep track of free seats at rows. Assume some random booking to start with. Use array to store
pointers (Head pointer) to each row. On demand
a) The list of available seats is to be displayed
b) The seats are to be booked.
c) The booking can be cancelled.
Code:
#include<iostream>
using namespace std;
class mynode
{
public:
char book_stats;
mynode *prev,*next;
};
class thetr_cinemax
{
public:
mynode *head,*last;
//member functions
void create();
void show();
void book_tkt();
void cancel_tkt();
thetr_cinemax()
{
head=NULL;
}
};
void thetr_cinemax::create() //function to create arrangement.
{
mynode *n;
for(int i=0;i<=7;i++)
{
n=new mynode;
n->book_stats=NULL;
n->prev=NULL;
if(head==NULL)
{
head=n;
n->next=head;
}
else
{
mynode *t1,*t2;
t1=head;
while(t1->next!=head)
{
t2=t1;
t1=t1->next;
}
t1->next=n;
n->prev=t1;
n->next=head;
t1->prev=t2;
}
}
}
void thetr_cinemax::show()
{
mynode *temp;
temp=head;
while(temp->next!=head)
{
cout<<"("<<temp->book_stats<<")"<<"\t";
temp=temp->next;
}
}
void thetr_cinemax::book_tkt()
{
mynode *temp;
int row1,i;
cout<<"Enter seat number you want to book:";
cin>>row1;
temp=head;
for(i=1;i<row1;i++)
{
temp=temp->next;
}
if(temp->book_stats=='B')
{
cout<<"\n Selected seat is not available!!!\n";
}
else
{
temp->book_stats='B';
}
}
void thetr_cinemax::cancel_tkt()
{
mynode *temp;
int row1,i;
cout<<"Enter seat number you want to cancel:";
cin>>row1;
temp=head;
for(i=1;i<row1;i++)
{
temp=temp->next;
}
if(temp->book_stats==NULL)
{
cout<<"\n The selected seat is free.\n\n";
}
else
{
temp->book_stats=NULL;
}
}
int main()
{
int row,j=1,choice;
char ans;
thetr_cinemax c[10];
for(int i=1;i<10;i++)
{
c[i].create();
}
for(int a=0;a<7;a++)
{
cout<<"\t"<<j;
++j;
}
cout<<endl;
j=1;
for(int i=1;i<10;i++)
{
cout<<j<<"\t";
c[i].show();
cout<<endl;
++j;
}
do
{
cout<<" 1.Display Status \n 2.Book Seat\n 3. Cancel Seat\n";
cout<<"Select your choice:";
cin>>choice;
switch(choice)
{
case 1:
j=1;
for(int i=1;i<10;i++)
{
cout<<j<<"\t";
c[i].show();
cout<<endl;
++j;
}
case 2:
cout<<"Enter number of row in which you want to book a seat:";
cin>>row;
c[row].book_tkt();
j=1;
for(int k=0;k<7;k++)
{
cout<<"\t"<<j;
++j;
}
cout<<endl;
j=1;
for(int i=1;i<10;i++)
{
cout<<j<<"\t";
c[i].show();
cout<<endl;
++j;
}
break;
case 3:
cout<<"Enter number of row from which you want to cancel a seat:";
cin>>row;
c[row].cancel_tkt();
j=1;
for(int k=0;k<7;k++)
{
cout<<"\t"<<j;
j++;
}
cout<<endl;
j=1;
for(int i=1;i<10;i++)
{
cout<<j<<"\t";
c[i].show();
cout<<endl;
++j;
}
break;
default:
cout<<"\n Invalid choice:";
}
cout<<"\n\n Do you want to continue? (y/n):";
cin>>ans;
}while(ans=='y');
return 0;
}
Output:
