diff --git a/EOOP/Various/LICENSE b/EOOP/Various/LICENSE
new file mode 100644
index 00000000..37b2665c
--- /dev/null
+++ b/EOOP/Various/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 Krzysztof Rudnicki
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/EOOP/Various/currency/currency.cpp b/EOOP/Various/currency/currency.cpp
new file mode 100755
index 00000000..e81d6f02
--- /dev/null
+++ b/EOOP/Various/currency/currency.cpp
@@ -0,0 +1,94 @@
+/**
+   Unit tests for 2nd EOOP assignment.
+
+   Currency - aggregate 2 doubles (monetary value, exchange rate to dollars)
+   CurrencyView - view the given currency with different exchange rate
+                  (e.g. view PLN value in GBP), store the reference to the Currency.
+
+   Note that this is in a big part "code reading" exercise.
+   Based on this file you should implement two classes mentioned above,
+   with proper interface, and in the right header file.
+
+   Make sure that you use proper method composition in your code.
+
+   Please make sure that you compile your solution with warnings enabled and that there are no warnings during compilation. You can do this via the following command:
+   g++ -Wall -Wextra -Werror -pedantic lab_2.cpp currency.hpp
+ */
+
+#include "currency2.hpp"
+#include <iostream>
+
+int main() {
+    double monetary_value = 8;
+    double usd_exchange_rate = 0.23;
+
+    Currency pln(monetary_value, usd_exchange_rate);
+
+    if (pln.getValue() != 8) {
+        std::cerr << "Error in getValue()" << std::endl;
+    }
+    if (pln.getUSDExchangeRate() != 0.23) {
+        std::cerr << pln.getUSDExchangeRate() << std::endl;
+        std::cerr << "Error in getUSDExchangeRate()" << std::endl;
+    }
+
+    pln.setValue(42);
+    pln.setUSDExchangeRate(0.24);
+    if (pln.getValue() != 42) {
+        std::cerr << "Error in setValue()" << std::endl;
+    }
+    if (pln.getUSDExchangeRate() != 0.24) {
+        std::cerr << "Error in setUSDExchangeRate()" << std::endl;
+    }
+
+    Currency gbp(1336, 1.2);
+    Currency usd(78, 1);
+
+    if (gbp.toDollars() != 1603.2) {
+        std::cerr << "Error in toDollars() 1" << std::endl;
+    }
+    if (usd.toDollars() != 78) {
+        std::cerr << "Error in toDollars() 2" << std::endl;
+    }
+
+    gbp.setValueFromDollars(1800);
+    usd.setValueFromDollars(120);
+    pln.setValueFromDollars(180);
+    if (gbp.getValue() != 1500) {
+        std::cerr << "Error in setValueFromDollars() 1" << std::endl;
+    }
+    if (usd.getValue() != 120) {
+        std::cerr << "Error in setValueFromDollars() 2" << std::endl;
+    }
+    if (pln.getValue() != 750) {
+        std::cerr << "Error in setValueFromDollars() 3" << std::endl;
+    }
+
+
+    usd.addValue(gbp);
+    if (usd.getValue() != 1920) {
+        std::cerr << "Error in addValue() 1" << std::endl;
+    }
+    gbp.addValue(pln);
+    if (gbp.getValue() != 1650) {
+        std::cerr << "Error in addValue() 2" << std::endl;
+    }
+    pln.addValue(usd);
+    if (pln.getValue() != 8750) {
+        std::cerr << "Error in addValue() 3" << std::endl;
+    }
+
+
+    CurrencyView in_gbp(pln, 1.2);
+    if (in_gbp.getValue() != 1750) {
+        std::cerr << "Error in CurrencyView::getValue() 1" << std::endl;
+    }
+    pln.setValue(100);
+    if (in_gbp.getValue() != 20) {
+        std::cerr << "Error in CurrencyView::getValue() 2" << std::endl;
+    }
+
+
+    std::cerr << "End of tests." << std::endl;
+    return 0;
+}
diff --git a/EOOP/Various/currency/currency.hpp b/EOOP/Various/currency/currency.hpp
new file mode 100755
index 00000000..9d802a8f
--- /dev/null
+++ b/EOOP/Various/currency/currency.hpp
@@ -0,0 +1,72 @@
+#include <iostream>
+
+
+class Currency
+{
+    private:
+        double monetary_value;
+        double usd_exchange_rate;
+    public:
+        Currency()
+        {
+            monetary_value = 0;
+            usd_exchange_rate = 1;
+        }
+
+        Currency(double value, double rate)
+        {
+            monetary_value = value;
+            usd_exchange_rate = rate;
+        }
+
+        double getValue() const { return monetary_value; };
+
+        double getUSDExchangeRate() const { return usd_exchange_rate; };
+
+        void setValue(double value)
+        {
+            monetary_value = value;
+            return;
+        };
+
+        void setUSDExchangeRate(double rate)
+        {
+            usd_exchange_rate = rate;
+            return;
+        };
+
+        double toDollars() const { return monetary_value * usd_exchange_rate; };
+
+        void setValueFromDollars(double dollarsValue)
+        {
+            monetary_value = dollarsValue / usd_exchange_rate;
+            return;
+        }
+
+        void addValue(Currency whichWeAdd)
+        {
+            monetary_value = (toDollars() + whichWeAdd.toDollars()) / usd_exchange_rate;
+        }
+};
+
+class CurrencyView
+{
+    private:
+        Currency& original;
+        double exchangeRate;
+    public:
+        CurrencyView(Currency& og, double rate);
+
+        double getValue() const;
+};
+
+CurrencyView::CurrencyView(Currency& reference, double rate) : original(reference)
+{
+    exchangeRate = rate;
+}
+
+double CurrencyView::getValue() const
+{
+    return original.toDollars() / exchangeRate;
+}
+
diff --git a/EOOP/Various/node/node.cpp b/EOOP/Various/node/node.cpp
new file mode 100755
index 00000000..7d225465
--- /dev/null
+++ b/EOOP/Various/node/node.cpp
@@ -0,0 +1,282 @@
+#include <iostream>
+
+struct list_node
+{
+    int value;
+    list_node *next;
+
+    list_node(int v, list_node* nxt = nullptr)
+    {
+        value = v;
+        next = nxt;
+    }
+};
+
+class list
+{
+    list_node *head;
+    int listSize;
+public:
+    list()
+    {
+        head = nullptr;
+        listSize = 0;
+    }
+    bool is_empty() const;
+    int size() const;
+    void push_front(int val);
+    void pop_front();
+    void clear();
+    // removes first occurence of `val` in the list
+    // returns true if removal occured
+    bool remove(int val);
+    list_node *get_head();
+    void printValues() const;
+};
+
+bool list::is_empty() const
+{
+    return head == nullptr;
+}
+
+int list::size() const
+{
+    return listSize;
+}
+
+void list::push_front(int val)
+{
+     list_node *pNewNode = new list_node(val);
+     pNewNode -> next = head;
+     head = pNewNode;
+     listSize++;
+     return;
+}
+
+void list::pop_front()
+{
+    if(is_empty())
+    {
+        std::cout << "There are no elements to be popped!" << std::endl;
+        return;
+    }
+
+    list_node *pTemp = head;
+    pTemp = pTemp -> next;
+    delete head;
+    head = pTemp;
+    listSize--;
+    return;
+}
+
+void list::printValues() const
+{
+    if(head == nullptr)
+    {
+        std::cout << "There are no values to be printed!" << std::endl;
+        return;
+    }
+    list_node *pNodes = head;
+    int i = 1;
+    while(pNodes)
+    {
+        std::cout << i << " value is: " << pNodes -> value << std::endl;
+        pNodes = pNodes -> next;
+        i++;
+    }
+    return;
+}
+
+void list::clear()
+{
+    if(head == nullptr)
+    {
+        std::cout << "The list is already empty! " << std::endl;
+        return;
+    }
+    while(head) pop_front();
+    listSize = 0;
+    return;
+}
+
+bool list::remove(int val)
+{
+    list_node *current = head;
+    list_node *previous = nullptr;
+    bool valueFound = 0;
+    while (current != nullptr)
+    {
+        if(current -> value == val)
+        {
+            valueFound = 1;
+            break;
+        }
+
+        previous = current;
+        current = current -> next;
+    }
+
+    if(!valueFound) return false;
+    if(previous == nullptr) head = head -> next; // THIS ELEMENT IS FIRST ELEMENT
+    else previous -> next = current -> next;
+    delete current;
+    listSize--;
+    return true;
+}
+
+list_node *list::get_head()
+{
+    return head;
+}
+
+void printIsEmptyValue(list printedList)
+{
+    std::cout << "is_empty() method value: " << printedList.is_empty() << std::endl;
+    return;
+}
+
+void isEmptyTest()
+{
+    std::cout << "TESTING is_empty() METHOD" << std::endl;
+    list testIsEmpty;
+    std::cout << "Testing for 0 elements" << std::endl;
+    printIsEmptyValue(testIsEmpty);
+    std::cout << "Testing for 1 element" << std::endl;
+    testIsEmpty.push_front(1);
+    printIsEmptyValue(testIsEmpty);
+    std::cout <<"Testing after deleting 1 element" << std::endl;
+    testIsEmpty.pop_front();
+    printIsEmptyValue(testIsEmpty);
+    return;
+}
+
+void printSize(list printList)
+{
+    std::cout << "Size of this list is: " << printList.size() << std::endl;
+    return;
+}
+
+void sizeTest()
+{
+    std::cout << "TESTING size() METHOD" << std::endl;
+    list testSize;
+    std::cout << "Testing for empty list: " << std::endl;
+    printSize(testSize);
+    std::cout << "Testing for 1 element list: " << std::endl;
+    testSize.push_front(1);
+    printSize(testSize);
+    std::cout << "Testing after removing one element from 1 element list: " << std::endl;
+    testSize.pop_front();
+    printSize(testSize);
+    std::cout << "Testing for 5 elements list: " << std::endl;
+    for(int i = 0; i < 5; i++) testSize.push_front(i);
+    printSize(testSize);
+    return;
+}
+
+void pop_frontTest()
+{
+    std::cout << "TESTING pop_front() METHOD" << std::endl;
+    list testPopFront;
+    std::cout << "Trying to pop empty list" << std::endl;
+    testPopFront.pop_front();
+    printIsEmptyValue(testPopFront);
+    printSize(testPopFront);
+    testPopFront.push_front(2137);
+    std::cout << "Poping one element list" << std::endl;
+    testPopFront.pop_front();
+    printIsEmptyValue(testPopFront);
+    printSize(testPopFront);
+    std::cout << "Poping two element list" << std::endl;
+    testPopFront.push_front(1);
+    testPopFront.push_front(2);
+    testPopFront.pop_front();
+    printIsEmptyValue(testPopFront);
+        printSize(testPopFront);
+    testPopFront.printValues();
+    return;
+}
+
+ void clearTest()
+ {
+     std::cout << "TESTING clear() METHOD" << std::endl;
+     list testClear;
+     std::cout << "Trying to clear empty list: " << std::endl;
+     testClear.clear();
+     printIsEmptyValue(testClear);
+     printSize(testClear);
+     testClear.printValues();
+     std::cout << "Clearing one element list: " << std::endl;
+     testClear.push_front(1);
+     testClear.clear();
+     printIsEmptyValue(testClear);
+     printSize(testClear);
+     testClear.printValues();
+     std::cout << "Clearing two element list: " << std::endl;
+     testClear.push_front(1);
+     testClear.push_front(2);
+     testClear.clear();
+     printIsEmptyValue(testClear);
+     printSize(testClear);
+     testClear.printValues();
+     std::cout << "Clearing five element list: " << std::endl;
+     for(int i = 0; i < 5; i++) testClear.push_front(i);
+     testClear.clear();
+     printIsEmptyValue(testClear);
+     printSize(testClear);
+     testClear.printValues();
+     return;
+ }
+
+ void printRemoveResult(list fromWhichRemove, int value)
+ {
+     if(fromWhichRemove.remove(value)) std::cout << "Removal of value: " << value << " Successful!" << std::endl;
+     else std::cout << "Removal of value: " << value << " Failed! " << std::endl;
+ }
+
+ void removeTest()
+ {
+    std::cout << "TESTING remove() METHOD " << std::endl;
+    list testRemove;
+    std::cout << "Trying to remove element from empty list: " << std::endl;
+    printRemoveResult(testRemove, 0);
+
+    std::cout << "Trying to remove wrong element from 1 element list: " << std::endl;
+    testRemove.push_front(1);
+    printRemoveResult(testRemove, 2);
+    std::cout << "Trying to remove right element from 1 element list: " << std::endl;
+    testRemove.push_front(1);
+    printRemoveResult(testRemove, 1);
+
+    return;
+
+ }
+
+void getHeadTest()
+{
+    list testHead;
+    std::cout << "Testing getHead for empty list: " << std::endl;
+    std::cout << "getHead value: " << testHead.get_head() << std::endl;
+    testHead.push_front(5);
+    std::cout << "Testing getHead for non empty list: " << std::endl;
+    std::cout << "getHead value: " << testHead.get_head() << std::endl;
+    return;
+}
+
+
+void runTests()
+{
+    isEmptyTest();
+    sizeTest();
+    pop_frontTest();
+    clearTest();
+    removeTest();
+    getHeadTest();
+    return;
+}
+
+int main()
+{
+    runTests();
+    return 0;
+}
diff --git a/EOOP/Various/ringBuffer/ring_buffer.cpp b/EOOP/Various/ringBuffer/ring_buffer.cpp
new file mode 100755
index 00000000..075d45d8
--- /dev/null
+++ b/EOOP/Various/ringBuffer/ring_buffer.cpp
@@ -0,0 +1,161 @@
+
+
+#include "ring_buffer.hpp"
+#include <array>
+#include <iostream>
+#include <stdexcept>
+
+void error_message(const std::string& message, int value, int expected) {
+    std::cerr << "Error - " << message << ", got: " << value << " expected " << expected << std::endl;
+}
+
+void error_message(const std::string& message) {
+    std::cerr << "Error - " << message << "!" << std::endl;
+}
+
+void check_buffer(const RingBuffer& buffer, unsigned int expected_size, unsigned int expected_capacity) {
+    bool is_empty = buffer.isEmpty();
+    bool is_full = buffer.isFull();
+    if (expected_size == 0) {
+        if (!is_empty) {
+            error_message("buffer should be empty");
+        }
+        if (is_full) {
+            error_message("buffer shouldn't be full");
+        }
+    } else {
+        if (is_empty) {
+            error_message("buffer shouldn't be empty");
+        }
+        if ((expected_size == expected_capacity) && !is_full) {
+            error_message("buffer should be full");
+        }
+    }
+    unsigned int size = buffer.size();
+    if (size != expected_size) {
+        error_message("wrong buffer size", static_cast<int>(size), static_cast<int>(expected_size));
+    }
+    unsigned int capacity = buffer.capacity();
+    if (capacity != expected_capacity) {
+        error_message("wrong buffer capacity", static_cast<int>(capacity), static_cast<int>(expected_capacity));
+    }
+}
+
+void check_empty_buffer() {
+    unsigned int capacity = 4;
+    RingBuffer buffer(capacity);
+    check_buffer(buffer, 0, capacity);
+}
+
+void check_write_without_overwriting() {
+    unsigned int capacity = 6;
+    RingBuffer buffer(capacity);
+    buffer.write(7);
+    check_buffer(buffer, 1, capacity);
+
+    buffer.write(42);
+    check_buffer(buffer, 2, capacity);
+}
+
+void check_read_without_overwriting() {
+    RingBuffer buffer(3);
+
+    buffer.write(7);
+    buffer.write(42);
+
+    int read_number = buffer.read();
+    if (read_number != 7) {
+        error_message("read", read_number, 7);
+    }
+    read_number = buffer.read();
+    if (read_number != 42) {
+        error_message("read", read_number, 42);
+    }
+    check_buffer(buffer, 0, 3);
+}
+
+void _check_reading_after_overwrite(RingBuffer& buffer, unsigned int capacity) {
+    for ( unsigned int i = 2; i <= capacity + 1; ++i ) {
+        int read_number = buffer.read();
+        if (read_number != static_cast<int>(i)) {
+            error_message("read with overwrite", read_number, static_cast<int>(i));
+        }
+    }
+
+    check_buffer(buffer, 0, capacity);
+}
+
+void check_overwriting() {
+    unsigned int capacity = 4;
+    RingBuffer buffer(capacity);
+
+    for (unsigned int i = 0; i <= capacity + 1; ++i) {
+        buffer.write(static_cast<int>(i));
+    }
+    check_buffer(buffer, capacity, capacity);
+
+    _check_reading_after_overwrite(buffer, capacity);
+}
+
+void check_copy_constructor() {
+    unsigned int capacity = 5;
+    RingBuffer buffer(capacity);
+
+    for (unsigned int i = 0; i <= capacity + 1; ++i) {
+        buffer.write(static_cast<int>(i));
+    }
+    check_buffer(buffer, capacity, capacity);
+
+    RingBuffer copied(buffer);
+
+    check_buffer(copied, capacity, capacity);
+
+    _check_reading_after_overwrite(buffer, capacity);
+    _check_reading_after_overwrite(copied, capacity);
+}
+
+void check_assignment_operator() {
+    unsigned int capacity = 5;
+    RingBuffer buffer(capacity);
+    RingBuffer other(capacity);
+
+    for (unsigned int i = 0; i <= capacity + 1; ++i) {
+        buffer.write(static_cast<int>(i));
+    }
+    check_buffer(buffer, capacity, capacity);
+    check_buffer(other, 0, capacity);
+
+    other = buffer;
+    check_buffer(other, capacity, capacity);
+
+    _check_reading_after_overwrite(buffer, capacity);
+    _check_reading_after_overwrite(other, capacity);
+}
+
+void check_exceptions() {
+    unsigned int capacity = 5;
+    RingBuffer buffer(capacity);
+    RingBuffer other(capacity - 1);
+
+    try {
+        buffer.read();
+        error_message("missing exception while reading from empty buffer");
+    } catch(std::exception& e) { }
+
+    try {
+        buffer = other;
+        error_message("missing exception in copy constructor");
+    } catch(std::exception& e) { }
+}
+
+int main() {
+    check_empty_buffer();
+    check_write_without_overwriting();
+    check_read_without_overwriting();
+    check_overwriting();
+    check_copy_constructor();
+    check_assignment_operator();
+    check_exceptions();
+    std::cout << "End of tests." << std::endl;
+    return 0;
+}
diff --git a/EOOP/Various/ringBuffer/ring_buffer.hpp b/EOOP/Various/ringBuffer/ring_buffer.hpp
new file mode 100755
index 00000000..8e7a4101
--- /dev/null
+++ b/EOOP/Various/ringBuffer/ring_buffer.hpp
@@ -0,0 +1,113 @@
+#ifndef RINGBUFFER_HPP
+#define RINGBUFFER_HPP
+#include <stdlib.h>
+#include <iostream>
+
+class RingBuffer {
+    public:
+        explicit RingBuffer(unsigned int capacity): capacity_ (capacity)
+        {
+            head_ = 0;
+            tail_ = 0;
+            size_ = 0;
+            overwritten = 0;
+            data_ = (int *)malloc(capacity_);
+        }
+        RingBuffer(const RingBuffer& other);
+
+        RingBuffer& operator=(const RingBuffer& other)
+        {
+            if(capacity_ != other.capacity_) throw std::exception();
+            head_ = other.head_;
+            tail_ = other.tail_;
+            size_ = other.size_;
+            overwritten = other.overwritten;
+            data_ = (int *)malloc(capacity_);
+            for(unsigned int i = 0; i < other.size_; i++)
+            {
+            data_[head_] = other.data_[head_];
+            if(overwritten)
+            {
+            tail_ = (tail_ + 1) % capacity_;
+            size_ = capacity_ - 1;
+            }
+            head_ = (head_ + 1) % capacity_;
+            overwritten = (head_ == tail_);
+            size_++;
+            }
+        }
+        ~RingBuffer();
+
+        unsigned int size() const { return size_; }
+        unsigned int capacity() const { return capacity_; }
+        bool isEmpty() const { return size_ == 0; }
+        bool isFull() const { return size_ == capacity_; }
+
+        int& read();
+
+        void write(int value);
+
+    private:
+        const unsigned int capacity_;
+        unsigned int size_;
+        unsigned int head_;
+        unsigned int tail_;
+        int* data_;
+        bool overwritten;
+};
+
+RingBuffer::~RingBuffer()
+{
+    if(data_)
+    {
+        delete data_;
+        data_ = nullptr;
+    }
+}
+
+void RingBuffer::write(int value)
+{
+    data_[head_] = value;
+    if(overwritten)
+    {
+        tail_ = (tail_ + 1) % capacity_;
+        size_ = capacity_ - 1;
+    }
+    head_ = (head_ + 1) % capacity_;
+    overwritten = (head_ == tail_);
+    size_++;
+}
+
+int& RingBuffer::read()
+{
+    if(size_ == 0) throw std::exception();
+
+    int& answer = data_[tail_];
+    overwritten = false;
+    tail_ = (tail_ + 1) % capacity_;
+    size_--;
+    return answer;
+}
+
+RingBuffer::RingBuffer(const RingBuffer& other): capacity_ (other.capacity_)
+{
+    head_ = other.head_;
+    tail_ = other.tail_;
+    size_ = other.size_;
+    overwritten = other.overwritten;
+    data_ = (int *)malloc(capacity_);
+    for(unsigned int i = 0; i < other.size_; i++)
+    {
+        data_[head_] = other.data_[head_];
+        if(overwritten)
+        {
+            tail_ = (tail_ + 1) % capacity_;
+            size_ = capacity_ - 1;
+        }
+        head_ = (head_ + 1) % capacity_;
+        overwritten = (head_ == tail_);
+        size_++;
+    }
+}
+
+#endif  // RINGBUFFER_HPP
diff --git a/EOOP/Various/ringBuffer2/ringbuffer2.cpp b/EOOP/Various/ringBuffer2/ringbuffer2.cpp
new file mode 100755
index 00000000..4c5a3455
--- /dev/null
+++ b/EOOP/Various/ringBuffer2/ringbuffer2.cpp
@@ -0,0 +1,359 @@
+// Krzysztof Rudnicki, 307585, EADS 2
+#include <iostream>
+
+void print(const std::string s)
+{
+	std::cout << s << std::endl;
+}
+
+template<typename Key, typename Info>
+class Ring{
+private:
+	struct Node{
+		Key key;
+		Info info;
+		Node* next;
+		Node* prev;
+	};
+	Node* any;
+public:
+
+	class Iterator
+	{
+		private:
+			Node* pNode;
+		public:
+			Iterator() { pNode = nullptr; }
+			~Iterator() { pNode = nullptr; }
+			Iterator(Node* ptr) : pNode(ptr) {}
+			
+			bool operator!=(const Iterator& other) const
+			{
+				return pNode != other.pNode;
+			}
+
+			Iterator& operator++()
+			{
+				pNode = pNode -> next;
+				return *this;
+			}
+			
+			Iterator operator++(int)
+			{
+				Iterator it = *this;
+				pNode = pNode -> next;
+				return it;
+			}
+			
+				Iterator& operator--()
+			{
+				pNode = pNode -> prev;
+				return *this;
+			}
+			
+			Iterator operator--(int)
+			{
+				Iterator it = *this;
+				pNode = pNode -> prev;
+				return it;
+			}
+
+			Node& operator[](int index)
+			{
+				Node* indexedNode = pNode;
+				for(int i = 0; i < index; i++)
+				{
+					indexedNode = indexedNode -> next;
+				}
+				return *indexedNode;
+			}
+			
+			Node* operator->()
+			{
+				return pNode;
+			}
+			
+			Node& operator*()
+			{
+				return *pNode;
+			}
+			
+			bool operator==(const Iterator& other) const
+			{
+				return pNode == other.pNode;
+			}
+	};
+	
+	Ring();
+	~Ring();
+	void clearRing();
+	void print() const;
+	void addAtEnd(Key newKey, Info newInfo);
+	int size() const;
+	Iterator begin() const // I will treat "any" Node as a "begining" of a ring
+	{
+		return Iterator(any);
+	}
+	
+	Iterator end() const  // I will treat a Node just before "any" node as an "end" of a ring
+	{
+		if(any == nullptr) return nullptr;
+		return any -> prev;
+	}
+};
+
+template<typename Key, typename Info>
+Ring<Key, Info>::Ring()
+{
+	any = nullptr;
+}
+
+template<typename Key, typename Info>
+void Ring<Key, Info>::clearRing()
+{
+	if(any == nullptr) return;
+	Node* curr = any;
+	Node* temp = any;
+	do{
+		temp = curr;
+		curr = curr->next;
+		delete temp;
+	}while(curr != any);
+
+	delete any;
+}
+
+template<typename Key, typename Info>
+Ring<Key, Info>::~Ring()
+{
+	this -> clearRing();
+}
+
+template<typename Key, typename Info>
+void Ring<Key, Info>::print() const
+{
+	Node* curr = any;
+	do{
+		std::cout << curr -> key << "; " << curr->info << std::endl;
+		curr = curr->next;
+	}while (curr != any);
+}
+
+template<typename Key, typename Info>
+void Ring<Key, Info>::addAtEnd(Key newKey, Info newInfo)
+{
+	Node* newNode = new Node();
+	newNode -> key = newKey;
+	newNode -> info = newInfo;
+	if(any == nullptr)
+	{
+		any = newNode;
+		any -> next = any;
+		any -> prev = any;
+		return;
+	}
+	
+	if(any -> next == nullptr)
+	{
+		any -> next = newNode;
+		any -> prev = newNode;
+		newNode -> next = any;
+		newNode -> prev = any;
+		return;
+	}
+	
+	Node* curr = any;
+	while(curr -> next != any) curr = curr -> next;
+	any->prev = newNode;
+	curr->next = newNode;
+	newNode -> prev = curr;
+	newNode -> next = any;
+}
+
+template<typename Key, typename Info>
+int Ring<Key, Info>::size() const
+{
+	Node* curr = any;
+	int size = 0;
+	do{
+		size++;
+		curr = curr -> next;
+	}while (curr != any);
+	return size;
+}
+
+template <typename Key, typename Info>
+void printPair(const Key key, const Info info)
+{
+	std::cout << "Key: " << key << "; Info: " << info << std::endl;
+}
+
+bool testForEmpty()
+{
+	Ring<int, int> marcel;
+	Ring<int, int>::Iterator it = marcel.begin();
+	if(it != nullptr)
+	{
+		 print("testForEmpty");
+		return false;
+	}
+	return true;
+}
+
+bool testOneElement()
+{
+	Ring<int, int> marcel;
+	marcel.addAtEnd(1, 1);
+	Ring<int, int>::Iterator it = marcel.begin();
+	if(it -> key != 1 || it -> info != 1)
+	{
+		print("testForwardIncrementingOneElement");
+		return false;
+	}
+	return true;
+}
+
+bool testForwardIncrementing()
+{
+	Ring<int, int> marcel;
+	marcel.addAtEnd(1, 1);
+	marcel.addAtEnd(2, 2);
+	marcel.addAtEnd(3, 3);
+	marcel.addAtEnd(4, 4);
+	marcel.addAtEnd(5, 5);
+	int i = 0;
+	for( Ring<int, int>::Iterator it = marcel.begin();
+	it != marcel.end(); it++, i++)
+	{
+		if(it -> key != i + 1 || it -> info != i + 1)
+		{
+			print("testForwardIncrementingNormal");
+			return false;
+		}
+	}
+	if(marcel.end() -> key != 5 || marcel.end() -> info != 5)
+	{
+		print("testForwardIncrementingNormal");
+		return false;
+	}
+
+	return true;
+}
+
+bool testBackwardDecrementing()
+{
+	Ring<int, int> marcel;
+	marcel.addAtEnd(1, 1);
+	marcel.addAtEnd(2, 2);
+	marcel.addAtEnd(3, 3);
+	marcel.addAtEnd(4, 4);
+	marcel.addAtEnd(5, 5);
+	int i = 0;
+	for( Ring<int, int>::Iterator it = marcel.end();
+	it != marcel.begin(); it++, i++)
+	{
+		if(it -> key != 5 - i || it -> info != 5 - i)
+		{
+			print("testBackwardDecrementing");
+			return false;
+		}
+	}
+	if(marcel.begin() -> key != 1 || marcel.begin() -> info != 1)
+	{
+		print("testBackwardDecrementing");
+		return false;
+	}
+
+	return true;
+}
+
+bool testForwardSquareBracket()
+{
+	Ring<int, int> marcel;
+	marcel.addAtEnd(1, 1);
+	marcel.addAtEnd(2, 2);
+	marcel.addAtEnd(3, 3);
+	marcel.addAtEnd(4, 4);
+	marcel.addAtEnd(5, 5);
+	Ring<int, int>::Iterator it = marcel.begin();
+	for(int i = 0; i < marcel.size(); i++)
+	{
+		if(it[i].key != i + 1 || it[i].info != i + 1)
+		{
+			print("testForwardSquareBracket");
+			return false;
+		}
+	}
+	return true;
+}
+
+
+bool testBackwardSquareBracket()
+{
+	Ring<int, int> marcel;
+	marcel.addAtEnd(1, 1);
+	marcel.addAtEnd(2, 2);
+	marcel.addAtEnd(3, 3);
+	marcel.addAtEnd(4, 4);
+	marcel.addAtEnd(5, 5);
+	Ring<int, int>::Iterator it = marcel.end();
+	for(int i = marcel.size(); i > 0; i--)
+	{
+		if(it[i].key != i || it[i].info != i)
+		{
+			print("testBackwardSquareBracket");
+			return false;
+		}
+	}
+	return true;
+}
+
+bool testSquareBracketRandomOverflow()
+{
+	Ring<int, int> marcel;
+	marcel.addAtEnd(1, 1);
+	marcel.addAtEnd(2, 2);
+	marcel.addAtEnd(3, 3);
+	marcel.addAtEnd(4, 4);
+	marcel.addAtEnd(5, 5);
+	Ring<int, int>::Iterator it = marcel.begin();
+	//Checking for some random places in ring:
+	if(it[2].key != 3) 
+	{
+		print("testSquareBracketRandomOverflow");
+		return false;
+	}
+	
+	if(it[4].key != 5) 
+	{
+		print("testSquareBracketRandomOverflow");
+		return false;
+	}
+	
+	if(it[0].key != 1) 
+	{
+		print("testSquareBracketRandomOverflow");
+		return false;
+	}
+	//Checking for overflow:
+	if(it[10].key != 1) 
+	{
+		print("testSquareBracketRandomOverflow");
+		return false;
+	}
+	return true;
+}
+
+bool tests()
+{
+	return testForEmpty()&&testOneElement()&&testForwardIncrementing()
+	&&testBackwardDecrementing()&&testForwardSquareBracket()&&testBackwardSquareBracket()
+	&&testSquareBracketRandomOverflow();
+}
+
+int main()
+{
+	std::cout << "Result of tests is: " << tests() << std::endl;
+	return 1;
+	
+}
\ No newline at end of file
diff --git a/EOOP/Various/ringBuffer2/ringbuffer3.cpp b/EOOP/Various/ringBuffer2/ringbuffer3.cpp
new file mode 100755
index 00000000..2aa74c44
--- /dev/null
+++ b/EOOP/Various/ringBuffer2/ringbuffer3.cpp
@@ -0,0 +1,406 @@
+#include <iostream>
+
+using namespace std;
+
+template <typename Key, typename Info>
+class Ring
+{
+private:
+    struct Node
+    {
+        Key key;
+        Info info;
+        Node *prev;
+        Node *next;
+    };
+    Node *head;
+
+public:
+    class Iterator
+    {
+    private:
+        Node *ptr;
+        Node *headPtr;
+        Iterator(Node*);
+        friend class Ring<Key, Info>;
+    public:
+        Iterator();
+        Iterator(Ring);
+        Info getInfo();
+        Key getKey();
+        void printData(int);
+        Info operator*();
+        Iterator& operator++();//prefix
+        Iterator operator++(int);//postfix
+        Iterator& operator--();//prefix
+        Iterator operator--(int);//postfix
+        bool operator==(const Iterator&);
+        bool operator!=(const Iterator&);
+        bool isFirst();
+        bool isLast();
+    };
+
+    Ring();
+    ~Ring();
+    void insertAtBeginning(const Key& k, const Info& inf);
+    void insertAtEnd(const Key& k, const Info& inf);
+    void removeAtBeginning();
+    void removeAtEnd();
+    void clear();
+
+    void printContent();
+    void printContentReverse();
+
+    Iterator begin();
+    Iterator end();
+};
+
+//main function
+int main()
+{
+    //test 1 - printing
+
+    Ring<char, string> ring;
+
+    ring.insertAtEnd('a', "letter 1");
+    ring.insertAtEnd('b', "letter 2");
+    ring.insertAtEnd('c', "letter 3");
+    ring.insertAtEnd('d', "letter 4");
+    ring.insertAtEnd('e', "letter 5");
+
+    cout << "Normal print:" << endl;
+    ring.printContent();
+
+    Ring<char, string>::Iterator *ringIt = new Ring<char, string>::Iterator(ring);
+
+    cout << endl << "Iterator print:" << endl;
+    int number = 0;
+    while (ringIt->isLast() == false)
+    {
+        ringIt->printData(number);
+
+        number++;
+        ++ringIt;
+    }
+
+
+    return 0;
+}
+
+//------------------------------Ring functions
+
+template <typename Key, typename Info>
+Ring<Key, Info>::Ring()
+{
+    head = nullptr;
+}
+
+template <typename Key, typename Info>
+Ring<Key, Info>::~Ring()
+{
+    clear();
+}
+
+template <typename Key, typename Info>
+void Ring<Key, Info>::insertAtBeginning(const Key& k, const Info& inf)
+{
+    if (head == nullptr)
+    {
+        Node *newNode = new Node();
+        newNode->key = k;
+        newNode->info = inf;
+        newNode->next = newNode;
+        newNode->prev = newNode;
+
+        head = newNode;
+
+        return;
+    }
+
+    Node *last = head->prev;
+
+    Node *newNode = new Node();
+    newNode->key = k;
+    newNode->info = inf;
+    newNode->prev = last;
+    last->next = newNode;
+
+    newNode->next = head;
+    head->prev = newNode;
+
+    head = newNode;
+}
+
+template <typename Key, typename Info>
+void Ring<Key, Info>::insertAtEnd(const Key& k, const Info& inf)
+{
+    if (head == nullptr)
+    {
+        Node *newNode = new Node();
+        newNode->key = k;
+        newNode->info = inf;
+        newNode->next = newNode;
+        newNode->prev = newNode;
+
+        head = newNode;
+
+        return;
+    }
+
+    Node *last = head->prev;
+
+    Node *newNode = new Node();
+    newNode->key = k;
+    newNode->info = inf;
+
+    newNode->prev = last;
+    last->next = newNode;
+
+    newNode->next = head;
+    head->prev = newNode;
+}
+
+template <typename Key, typename Info>
+void Ring<Key, Info>::removeAtBeginning()
+{
+    if (head == nullptr)
+        return;
+
+    if (head->next == head)
+    {
+        delete head;
+        head = nullptr;
+
+        return;
+    }
+
+    Node *prev = head->prev;
+    Node *next = head->next;
+
+    prev->next = next;
+    next->prev = prev;
+
+    delete head;
+    head = next;
+}
+
+template <typename Key, typename Info>
+void Ring<Key, Info>::removeAtEnd()
+{
+    if (head == nullptr)
+        return;
+
+    if (head->next == head)
+    {
+        delete head;
+        head = nullptr;
+
+        return;
+    }
+
+    Node *prev = head->prev->prev;
+    //Node *next = head;
+
+    delete head->prev;
+
+    prev->next = head;
+    head->prev = prev;
+}
+
+template <typename Key, typename Info>
+void Ring<Key, Info>::clear()
+{
+    while (head != nullptr)
+        removeAtEnd();
+}
+
+template <typename Key, typename Info>
+void Ring<Key, Info>::printContent()
+{
+    if (head == nullptr)
+        return;
+
+    Node *current = head;
+    int number = 0;
+
+    do
+    {
+        cout << number << "# - Key: " << current->key << ", Info: " << current->info << endl;
+
+        number++;
+        current = current->next;
+    } while (current != head);
+}
+
+template <typename Key, typename Info>
+void Ring<Key, Info>::printContentReverse()
+{
+    if (head == nullptr)
+        return;
+
+
+    if (head->next == head)
+    {
+        cout << "0# - Key: " << head->key << ", Info: " << head->info << endl;
+    }
+
+    Node *current = head->prev;
+    int number = 0;
+
+    do
+    {
+        cout << number << "# - Key: " << current->key << ", Info: " << current->info << endl;
+
+        number++;
+        current = current->prev;
+    } while (current != head);
+}
+
+template <typename Key, typename Info>
+typename Ring<Key, Info>::Iterator Ring<Key, Info>::begin()
+{
+    Ring<Key, Info>::Iterator tempIter = new Ring<Key, Info>::Iterator(head);
+
+    return tempIter;
+}
+
+template <typename Key, typename Info>
+typename Ring<Key, Info>::Iterator Ring<Key, Info>::end()
+{
+    Ring<Key, Info>::Iterator tempIter = new Ring<Key, Info>::Iterator(head->prev);
+
+    return tempIter;
+}
+
+//------------------------------Ring Iterator functions
+
+template <typename Key, typename Info>
+Ring<Key, Info>::Iterator::Iterator()
+{
+    ptr = nullptr;
+    headPtr = nullptr;
+}
+
+template <typename Key, typename Info>
+Ring<Key, Info>::Iterator::Iterator(Node* nodePtr)
+{
+    ptr = nodePtr;
+    headPtr = nodePtr;
+}
+
+template <typename Key, typename Info>
+Ring<Key, Info>::Iterator::Iterator(Ring<Key, Info> ring)
+{
+    ptr = ring.head;
+    headPtr = ring.head;
+}
+
+template <typename Key, typename Info>
+Info Ring<Key, Info>::Iterator::getInfo()
+{
+    if (ptr != nullptr)
+        return ptr->info;
+    else
+        throw "Iterator was nullptr";
+}
+
+template <typename Key, typename Info>
+Key Ring<Key, Info>::Iterator::getKey()
+{
+    if (ptr != nullptr)
+        return ptr->key;
+    else
+        throw "Iterator was nullptr";
+}
+
+template <typename Key, typename Info>
+void Ring<Key, Info>::Iterator::printData(int number)
+{
+    if (ptr != nullptr)
+        cout << number << "# - Key: " << ptr->key << ", Info: " << ptr->info << endl;
+    else
+        cout << "Tried to print an empty iterator" << endl;
+}
+
+template <typename Key, typename Info>
+Info Ring<Key, Info>::Iterator::operator*()
+{
+    if (ptr != nullptr)
+        return ptr->info;
+    else
+        throw "Iterator was nullptr";
+}
+
+template <typename Key, typename Info>
+typename Ring<Key, Info>::Iterator& Ring<Key, Info>::Iterator::operator++()
+{
+    if (ptr != nullptr && headPtr != nullptr && ptr->next != headPtr)
+        ptr = ptr->next;
+
+    return *this;
+}
+
+template <typename Key, typename Info>
+typename Ring<Key, Info>::Iterator Ring<Key, Info>::Iterator::operator++(int)
+{
+    Ring<Key, Info>::Iterator incremented = *this;
+
+    ++(*this);
+    return incremented;
+}
+
+template <typename Key, typename Info>
+typename Ring<Key, Info>::Iterator& Ring<Key, Info>::Iterator::operator--()
+{
+    if (ptr != nullptr && headPtr != nullptr && ptr != headPtr)
+        ptr = ptr->prev;
+
+    return *this;
+}
+
+template <typename Key, typename Info>
+typename Ring<Key, Info>::Iterator Ring<Key, Info>::Iterator::operator--(int)
+{
+    Ring<Key, Info>::Iterator decremented = *this;
+
+    --(*this);
+    return decremented;
+}
+
+template <typename Key, typename Info>
+bool Ring<Key, Info>::Iterator::operator==(const Ring<Key, Info>::Iterator& iter)
+{
+    if (ptr == iter->ptr)
+        return true;
+    else
+        return false;
+}
+
+template <typename Key, typename Info>
+bool Ring<Key, Info>::Iterator::operator!=(const Ring<Key, Info>::Iterator& iter)
+{
+    if (operator==(this))
+        return false;
+    else
+        return true;
+}
+
+
+template <typename Key, typename Info>
+bool Ring<Key, Info>::Iterator::isLast()
+{
+    cout << (ptr != nullptr) << " " << (headPtr != nullptr) << " " << (ptr->next == headPtr) << endl;
+    if (ptr != nullptr && headPtr != nullptr && ptr->next == headPtr)
+        return true;
+    else
+        return false;
+}
+
+template <typename Key, typename Info>
+bool Ring<Key, Info>::Iterator::isFirst()
+{
+    if (ptr != nullptr && headPtr != nullptr && ptr == headPtr)
+        return true;
+    else
+        return false;
+}