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queue.cpp
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61 lines (49 loc) · 871 Bytes
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#include<iostream>
// this is queue using array and class.
using namespace std;
class Queue{
private:
int rear;
int front;
int size;
int *Q;
public:
Queue(){ front = rear = -1; size = 10; Q = new int[size]; }
Queue(int size){ front = rear = -1; this->size = size; Q = new int[this->size]; }
void enqueue(int x);
int dequeue();
void Display();
};
void Queue::enqueue(int x){
if(rear==size-1){
cout<<"Queue is full\n";
}
else{
rear++;
Q[rear]=x;
}
}
int Queue::dequeue(){
int x = -1;
if(front==rear){
cout<<"Queue is empty\n";
}
else{
x = Q[front+1];
front++;
return x;
}
}
void Queue::Display(){
for(int i = front+1; i<=rear; i++){
cout<<Q[i]<<endl;
}
}
int main(){
Queue q(5);
q.enqueue(10);
q.enqueue(20);
q.enqueue(30);
q.dequeue();
q.Display();
}