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/quetype.h: (Added one more function front_element() which will return the first element of the queue, which will be required while displaying the queue)

#ifndef QUETYPE_H_INCLUDED
#define QUETYPE_H_INCLUDED class
class FullQueue
{};
class EmptyQueue
{};

template <class ItemType> 
class QueType
{
    struct NodeType
    {
        ItemType info;
        NodeType* next;
    };
    public :
        QueType();
        ~QueType();
        void MakeEmpty();
        void Enqueue(ItemType);
        void Dequeue(ItemType&);
        bool IsEmpty();
        bool IsFull();
        ItemType front_element(); //Function to return the front element of queue
    private:
        NodeType *front, *rear;
};

#endif // QUETYPE_H_INCLUDED
//quetype.***:

#include "quetype.h"
#include <iostream>
using namespace std;

template <class ItemType> //Template declared
QueType<ItemType>::QueType() //Cosntructor
{
    front = NULL;
    rear = NULL;
}

template <class ItemType>
bool QueType<ItemType>::IsEmpty() //Will return true if queue is empty else false
{
    return (front == NULL);
}

template<class ItemType>
bool QueType<ItemType>::IsFull() //Will return true if queue is full
{
    NodeType* location;
    try {
        location = new NodeType;
        delete location;
        return false;
    }
    catch(bad_alloc& exception)
    {
        return true;
    }
}

template <class ItemType>
void QueType<ItemType>::Enqueue(ItemType newItem) //To Enqueue element in queue
{
    if (IsFull())
        throw FullQueue();
    else{
        NodeType* newNode;
        newNode = new NodeType;
        newNode->info = newItem;
        newNode->next = NULL;
        if (rear == NULL)
            front = newNode;
        else
            rear->next = newNode;
        rear = newNode;
    }
}

template <class ItemType>
void QueType<ItemType>::Dequeue(ItemType& item) //To Dequeue element from queue
{
    if(IsEmpty())
        throw EmptyQueue();
    else{
        NodeType* tempPtr;
        tempPtr = front;
        item = front->info;
        front = front->next;
        if(front == NULL)
            rear = NULL;
        delete tempPtr;
    }
}

template <class ItemType>
void QueType<ItemType>::MakeEmpty() //Function to clear the queue
{
    NodeType* tempPtr;
    while (front != NULL)
    {
        tempPtr = front;
        front = front->next;
        delete tempPtr;
    }
    rear = NULL;
}

template <class ItemType>
QueType<ItemType>::~QueType() //Destructor 
{
    MakeEmpty();
}

template <class ItemType>
ItemType QueType<ItemType>::front_element() //Function which will return the frist element of queue
{
    return front->info;
}

//main.***

#include "quetype.***" //Import quetype.*** file
#include<iostream>
using namespace std;

// n is size of coins array (number of different coins)
int calCoins(int coins[], int n, int amount) //Function to calculate the number of coins
{
    // table[i] will be storing the minimum number of coins
    // required for i value. So table[amount] will have result
    int table[amount+1];

// Base case (If given value amount is 0)
    table[0] = 0;

// Initialize all table values as Infinite
    for (int **1; i<=amount; i++)
        table[i] = INT_MAX;

// Compute minimum coins required for all
    // values from 1 to amount
    for (int **1; i<=amount; i++)
    {
        // Go through all coins smaller than i
        for (int j=0; j<n; j++)
        if (coins[j] <= i)
        {
            int sub_res = table[i-coins[j]];
            if (sub_res != INT_MAX && sub_res + 1 < table[i])
                table[i] = sub_res + 1;
        }
    }

if(table[amount]==INT_MAX) //i.e. not found
        return -1;

return table[amount];
}

int main() //Main function
{
    QueType<int> obj; //Create the object of Queue
    
    if(obj.IsEmpty()) //Check if queue is empty or not
    {
        cout<<"queue is empty\n";
    }
    else
    {
        cout<<"queue is not empty\n";
    }
    //Insert elements in Queue
    obj.Enqueue(5);
    obj.Enqueue(7);
    obj.Enqueue(4);
    obj.Enqueue(2);
    
    if(obj.IsEmpty()) //Again check if queue is empty
    {
        cout<<"queue is empty\n";
    }
    else
    {
        cout<<"queue is not empty\n";
    }
    
    QueType<int> obj1; //Declare one more object of queue, which will keep copy of object obj
    //Loop to display the element of queue in same order
    while(1)
    {
        if(obj.IsEmpty())
            break; //Break if queu is empty
        int front = obj.front_element(); 
        obj1.Enqueue(front); //Insert element in obj1 (i.e. make copy of obj)
        cout<<front<<" ";
        obj.Dequeue(front); //Remove the front element from obj, so that we can get all elements from queue
    }
    cout<<"\n";
    //Note: Obj1 hold the copy of obj

if(obj1.IsFull()) //Check if queue is full or not
    {
        cout<<"queue is full\n";
    }
    else
        cout<<"queue is not full\n";
        
    //To display dequeu function, dequeue all elements from obj1 untill queue is not empty
    while(!obj1.IsEmpty())
    {
        int front = obj1.front_element();
        cout<<"Element "<<front<<" removed from Queue\n";
        obj1.Dequeue(front); //Dequeue functionality
    }
    
    cout<<"==================================================\n\n";
    //Now, program is for calculating the number of coin to make the given amount
    int n, amount;
    cout<<"Give input for calculating no of coins: "; //Take input from user
    cin>>n;
    int coins[n];
    for(int i = 0; i < n; ++i)
        cin>>coins[i];
    cin>>amount;
    
    cout<<"Coinse reqired to make amount of "<<amount<<" is "<<calCoins(coins, n, amount); //Call funciton

return 0;
}

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