Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Complete TODOs in c++

 

#include <iostream>
#include "QueueLL.hpp"

using namespace std;

QueueLL::QueueLL()
{
queueFront = nullptr;
queueEnd = nullptr;
}

QueueLL::~QueueLL()
{
while( !isEmpty() )
dequeue();
}

bool QueueLL::isEmpty()
{
/*if(queueFront == nullptr || queueEnd == nullptr)
return true;
return false;*/
return (!queueFront || !queueEnd);
}

// TODO
void QueueLL::enqueue(int key)
{
Node *nn = newNode;
nn->key = key;
nn->next = nullptr;

// TODO Complete this function, handle the case when you're enqueuing in an empty queue
}

//TODO
void QueueLL::dequeue()
{
if(!isEmpty())
{
// TODO Complete this function, handle the case when your queue becomes empty after dequeuing
}
else{
cout<<"queue is empty. can not deque"<<endl;
}
}

int QueueLL::peek()
{
if( !isEmpty() )
returnqueueFront->key;
else
{
cout<<" queue is empty. can not peek"<<endl;
return -1;
}
//return 0;
}
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