How to write C++ program for Circular Queue using Array
C++ program to implement Circular Queue using Array
Circular Queue implementation using Array
CPP program for implementing Circular Queue using Array
CPP program for implementing Circular Queue using Array
#include<iostream>
using namespace std;
#define MAXSIZE 4
class queue
{
private:
int
cq[MAXSIZE];
int front,
rear;
public:
queue()
{
int
cq[MAXSIZE]={0};//error: array must be initialized with a
brace-enclosed initializer
front=
-1;
rear =
-1;
}
void insert(int
item)
{
cout<<"\n
in insert.\t";
if( (
(front==0)&&(rear==MAXSIZE-1)%MAXSIZE ) ||
front==(rear+1)%MAXSIZE )
{
cout<<"Q
is full.\n";
}
else
{
if(front==-1)
front=rear=0;
else
rear=(rear+1)%MAXSIZE;
cq[rear]=item;
cout<<"\n
front = "<<front<<" rear = "<<rear<<endl;
}
}
void display()
{
int i;
for(i=0;i<MAXSIZE;i++)
{
cout<<cq[i]<<" ";
}
cout<<endl;
}
void deletee()
{
if(front==-1)
{
cout<<"Q
is empty.\n";
}
else
{
int temp;
temp=cq[front];
cq[front]=0;
if(front==rear)//only 1 elt was there
front=rear=-1;//delete the single so q is empty
else
front=(front+1)%MAXSIZE;//if more than 1 elt then delete frm front
cout<<"\n
Deleted elt is:"<<temp<<endl;
cout<<"\n
front = "<<front<<" rear = "<<rear<<endl;
}
}
};
int main()
{
queue q;
q.insert(10);
q.insert(20);
q.insert(30);
q.insert(40);
q.display();
q.insert(111);//Q is full so make same place by deleting fronts
q.display();
q.deletee();
q.display();
q.insert(100);
q.display();
return 0;
}
/*
in insert.
front = 0 rear = 0
in insert.
front = 0 rear = 1
in insert.
front = 0 rear = 2
in insert.
front = 0 rear = 3
10 20 30
40
in insert. Q is
full.
10 20 30
40
Deleted elt is 10.
front = 1 rear = 3
0 20 30
40
in insert.
front = 1 rear = 0
100 20 30
40
*/
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