Ticket window - Program Using Queue



Ticket window - Program Using Queue

#include <iostream.h>
#include <conio.h>
#include <process.h>

class ticketqueue{
private:
   //Data Members
   int q[5];
   int front, rear, noe;  //noe..to store number of elements

public:
   //Member Functions
   ticketqueue(){ noe = rear = front = 0;} //Constructor
   void enqueue(int);
   void ticketchecker();
   void print();
   int isempty();
   void queuebuilder();
   void menu();
};
/////////////////////
void ticketqueue :: enqueue(int a)
{
      q[rear] = a;
      rear++;
      noe++;
      if (rear == 5)
         rear = 0;
      cout<<"
"<<a<<" Is Enqeueued....."<<endl;
}
/////////////////////
void ticketqueue :: ticketchecker()
{
clrscr();
   int not,rt;
   if ( !isempty() )
      {
         not = q[front];
         if (not > 2)
            {
               rt = not - 2;
               if ( rt > 0 )
                  {
                     enqueue(rt);
                     front++;
                     cout<<"

"<<not<<"# Tickets were demanded. 2 Tickets are
given.
"
                      <<"
Enqueued again for next go to get remaining #"<<rt<<"
Tickets"<<endl;
                  }
               else if ( rt <= 0 )
                  front++;
                  noe--;

            }
         else if ( not <= 2 )
              {
                front++;
                noe--;
               cout<<"
"<<not<<"# tickets are given...."<<endl;
              }
         }
   else
      cout<<"
!!! NO REQUEST IN THE QUEUE " <<endl;

getch();
clrscr();
menu();
}
/////////////////////
void ticketqueue :: print()
{
clrscr();
   int i = front;
   if ( noe > 0 )
      {
         cout<<"
REQUESTS ENQUEUED ARE :" ;
         do
            {
               cout<<q[i]<<" ";
               i++;
               if ( i == 5 )
                  i = 0;
            }
         while ( i != rear );
      }
   else
      cout<<"
NO REQUEST IN QUEUE...QUEUE IS EMPTY ";
getch();
clrscr();
menu();
}
//////////////////

//Utility Fuction
int ticketqueue :: isempty()
{
   if ( noe == 0 )
      return 1;
   else
      return 0;
}
/////////////////

//This Function takes input from the user and shows Queue graphically

void ticketqueue::queuebuilder(){
   clrscr();
   int tickets, z = 0, i = 0, x = 20, y = 10, g = 1, h = 17;
   char c;
   cout<<"Enter number of tickets to purchase... "<<endl;
   while (!(c == 'E' || c == 'e'))
   {
       if ( z > 4)
         {
            clrscr();
            cout<<" 

 ERROR!!! Queue Size Violation...Exiting Now  "<<endl;
            getch();
            clrscr();
         menu();
         }

       else
         {
            cout<<"
Enter : ";
            cin>>tickets;
            enqueue(tickets);
            z++;
            gotoxy(17,10);
            cout<<"->";
            gotoxy(20,9);
            cout<<"----------------------------------";
            gotoxy(x,y);
            cout<<q[i];
            x+=2;
            gotoxy(20,11);
            cout<<"----------------------------------";
            gotoxy(g,h);
            cout<<"PRESS C/c to CONTINUE E/e to END: ";
            cin>>c;
            h += 6;

            i++;
         }
   }
getch();
clrscr();
menu();
}
//////////////////
void ticketqueue::menu()
{
int b;
gotoxy(15,5);
 cout<<"Press 1................ENTER NO OF TICKETS
";
gotoxy(15,8);
    cout<<"Press 2................TICKET CHECKER
";
gotoxy(15,11);
   cout<<"Press 3................ALL TICKET REQUESTS
";
gotoxy(15,15);
   cout<<"Press 4................EXIT
";
gotoxy(15,18);
   cout<<"NOW ENTER : ";

   cin>>b;

if ( b == 1 )
   queuebuilder();
else if ( b == 2 )
   ticketchecker();
else if ( b == 3 )
   print();
else if ( b == 4 )
   exit(1);
}
//////////////////


void main()
{
clrscr();
ticketqueue t;
t.menu();
getch();
}
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Ticket window - Program Using Queue

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