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Displaying  Source Code(s)  
 

 
Implementing Queue as a Class

--------------------------------------------------------------------------------



# include<iostream.h>
# include<conio.h>
# define SIZE 20

class queue
{
int a[SIZE];
int front;
int rear;
public:
queue();
~queue();
void insert(int i);
int remove();
int isempty();
int isfull();
};

queue::queue()
{
front=0;
rear=0;
}
queue::~queue()
{
delete []a;
}
void queue::insert(int i)
{
if(isfull())
{
cout<<"

******
Queue is FULL !!!
No insertion allowed further.
******<BR>;
return;
}
a[rear] = i;
rear++;
}
int queue::remove()
{
if(isempty())
{
cout<<"

******
Queue Empty !!!
Value returned will be garbage.
******<BR>;
return (-9999);
}

return(a[front++]);
}
int queue::isempty()
{
if(front == rear)
return 1;
else
return 0;
}
int queue::isfull()
{
if(rear == SIZE)
return 1;
else
return 0;
}

void main()
{
clrscr();
queue q;
q.insert(1);
q.insert(2);
cout<<"<BR><<q.remove();
cout<<"<BR><<q.remove();
cout<<"<BR><<q.remove();
getch();
}
 

 

 

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