manipulators for cout for StateList class

pr6.cpp

@@ -1,32 +1,26 @@
 #include <iostream>
 #include <stdexcept>
 #include <functional>
+#include <fstream>
+#include <sstream>
+#include <string>
+#include <iomanip>
 
 using namespace std;
 
-class State {
+// Манипулятор для вывода в научном формате
-public:
+template <typename T>
-    string name;
+ostream& scientific_format(ostream& os, const T& value) {
-    string capital;
+    os << std::scientific << value;
-    string language;
+    return os;
-    long population;
+}
-    double area;
 
-    State() : name(""), capital(""), language(""), population(0), area(0.0) {}
+// Манипулятор для вывода в 8-ричной системе счисления
-    State(string n, string c, string l, long p, double a)
+template <typename T>
-        : name(n), capital(c), language(l), population(p), area(a) {}
+ostream& octal_format(ostream& os, const T& value) {
-
+    os << std::oct << value;
-    friend ostream& operator<<(ostream& os, const State& state) {
+    return os;
-        os << "State: " << state.name << ", Capital: " << state.capital 
+}
-           << ", Language: " << state.language << ", Population: " << state.population 
-           << ", Area: " << state.area;
-        return os;
-    }
-
-    bool operator==(const State& other) const {
-        return name == other.name;
-    }
-};
 
 template<class T>
 class Element {
@@ -47,6 +41,10 @@ public:
         return info;
     }
 
+    T& getInfo() {
+        return info;
+    }
+
     Element* getNext() const {
         return next;
     }
@@ -55,8 +53,11 @@ public:
         next = nextElement;
     }
 
+    virtual ~Element() {}
+
     template<class T1> friend class LinkedList;
     template<class T1> friend class DoublyLinkedStack;
+    template<class T1> friend ostream& operator<<(ostream& s, const Element<T1>& el);
 };
 
 template<class T1>
@@ -79,6 +80,8 @@ public:
     virtual Element<T>* push(const T& value) = 0;
 
     bool isEmpty() { return count == 0; }
+    //getter
+    Element<T>* getHead() const { return head; }
 
     virtual ~LinkedList() {
         cout << "\nBase class destructor\n";
@@ -121,12 +124,13 @@ public:
             this->head = this->tail = nullptr;
         }
         else {
-            Element<T>* current = this->head;
+            /*Element<T>* current = this->head;
             while (current->getNext() != this->tail) {
                 current = current->getNext();
             }
             this->tail = current;
-            current->setNext(nullptr);
+            current->setNext(nullptr);*/
+            this->head = this->head->getNext();
         }
 
         this->count--;
@@ -187,7 +191,6 @@ public:
     using LinkedList<T>::isEmpty;
 };
 
-// New class definitions for Doubly Linked List Elements and Doubly Linked Stack
 template<class T>
 class DoublyLinkedElement : public Element<T> {
 protected:
@@ -213,6 +216,8 @@ class DoublyLinkedStack : public SinglyLinkedListStack<T> {
 public:
     DoublyLinkedStack() : SinglyLinkedListStack<T>() {}
 
+    using LinkedList::head;
+
     virtual Element<T>* push(const T& value) override {
         DoublyLinkedElement<T>* newElement = new DoublyLinkedElement<T>(value);
         if (this->head == nullptr) {
@@ -231,7 +236,9 @@ public:
         if (this->tail == nullptr)
             return nullptr;
 
-        DoublyLinkedElement<T>* res = static_cast<DoublyLinkedElement<T>*>(this->tail);
+        //DoublyLinkedElement<T>* res = static_cast<DoublyLinkedElement<T>*>(this->tail);
+        // Преобразование указателя на базовый класс в указатель на производный класс
+        DoublyLinkedElement<T>* res = dynamic_cast<DoublyLinkedElement<T>*>(this->tail);
 
         if (this->head == this->tail) {
             this->head = this->tail = nullptr;
@@ -315,30 +322,54 @@ public:
         this->count--;
     }
 
-    // Find the first element with the specified value
+    // Iterative version of find
     Element<T>* find(const T& value) const {
-        DoublyLinkedElement<T>* current = static_cast<DoublyLinkedElement<T>*>(this->head);
+        //DoublyLinkedElement<T>* current = static_cast<DoublyLinkedElement<T>*>(this->head);
+        Element<T>* current = this->head;
         while (current != nullptr) {
             if (current->getInfo() == value) {
                 return current;
             }
-            current = static_cast<DoublyLinkedElement<T>*>(current->getNext());
+            current = current->getNext(); //static_cast<DoublyLinkedElement<T>*>(current->getNext());
         }
         return nullptr;
     }
 
-    // Find all elements that satisfy the given condition
+    // Recursive version of find
+    Element<T>* find_recursive(const T& value, DoublyLinkedElement<T>* current) const {
+        if (current == nullptr) {
+            return nullptr;
+        }
+        if (current->getInfo() == value) {
+            return current;
+        }
+        return find_recursive(value, static_cast<DoublyLinkedElement<T>*>(current->getNext()));
+    }
+
+    // Iterative version of filter
     void filter(function<bool(const T&)> condition) const {
-        DoublyLinkedElement<T>* current = static_cast<DoublyLinkedElement<T>*>(this->head);
+        //DoublyLinkedElement<T>* current = static_cast<DoublyLinkedElement<T>*>(this->head);
+        Element<T>* current = this->head;
         while (current != nullptr) {
             if (condition(current->getInfo())) {
                 cout << current->getInfo() << " ";
             }
-            current = static_cast<DoublyLinkedElement<T>*>(current->getNext());
+            current = current->getNext();  //static_cast<DoublyLinkedElement<T>*>(current->getNext());
         }
         cout << endl;
     }
 
+    // Recursive version of filter
+    void filter_recursive(function<bool(const T&)> condition, DoublyLinkedElement<T>* current) const {
+        if (current == nullptr) {
+            return;
+        }
+        if (condition(current->getInfo())) {
+            cout << current->getInfo() << " ";
+        }
+        filter_recursive(condition, static_cast<DoublyLinkedElement<T>*>(current->getNext()));
+    }
+
     // Overloading the output stream operator
     friend ostream& operator<<(ostream& os, const DoublyLinkedStack& stack) {
         DoublyLinkedElement<T>* current = static_cast<DoublyLinkedElement<T>*>(stack.head);
@@ -364,6 +395,174 @@ public:
     }
 };
 
+class State {
+protected:
+    string name;
+    string capital;
+    string language;
+    long population;
+    double area;
+
+public:
+
+
+    State() : name(""), capital(""), language(""), population(0), area(0.0) {}
+    State(string n, string c, string l, long p, double a)
+        : name(n), capital(c), language(l), population(p), area(a) {}
+
+    friend ostream& operator<<(ostream& os, const State& state) {
+        os << "State: " << state.name << ", Capital: " << state.capital
+            << ", Language: " << state.language << ", Population: " << state.population
+            << ", Area: " << state.area;
+        return os;
+    }
+
+    bool operator==(const State& other) const {
+        return name == other.name;
+    }
+    // geters
+    string getName() const { return name; }
+    double getArea() const { return area; }
+    long getPopulation() const { return population; }
+    string getCapital() const { return capital; }
+    string getLanguage() const { return language; }
+
+};
+
+
+class StateList : public DoublyLinkedStack<State> {
+protected:
+    SinglyLinkedListQueue<State> stateList;
+
+public:
+    // Добавление нового государства в начало списка
+    //void addState(const State& state) {
+    //    stateList.push(state);
+    //}
+    virtual Element<State>* push(const State& state) override {
+        stateList.push(state);
+        return stateList.getHead();
+    }
+    friend ostream& operator<<(ostream& os, const StateList& stateList) {
+        Element<State>* current = stateList.stateList.getHead();
+        while (current != nullptr) {
+            //os << current->getInfo() << endl;
+            // Выводим элемент в научном виде и в 8-ричной системе счисления
+            os << scientific << current->getInfo() << " " << oct << current->getInfo() << endl;
+            current = current->getNext();
+        }
+        return os;
+    }
+
+    // Удаление государства из начала списка
+    virtual Element<State>* pop() override {
+        try {
+            return new Element<State>(removeState());
+        }
+        catch (const logic_error& e) {
+            cout << e.what() << endl;
+            return nullptr;
+        }
+    }
+    State removeState() {
+        Element<State>* element = stateList.pop();
+        if (element) {
+            State state = element->getInfo();
+            delete element;
+            return state;
+        }
+        throw logic_error("State list is empty");
+    }
+    // Поиск государства по названию
+    State* findStateByName(const string& name) {
+        Element<State>* current = stateList.getHead();
+        while (current != nullptr) {
+            if (current->getInfo().getName() == name) {
+                return &(current->getInfo());
+            }
+            current = current->getNext();
+        }
+        return nullptr;
+    }
+
+    // Фильтрация государств по площади
+    void printStatesByArea(double minArea, double maxArea) {
+        Element<State>* current = stateList.getHead();
+        while (current != nullptr) {
+            const State& state = current->getInfo();
+            if (state.getArea() >= minArea && state.getArea() <= maxArea) {
+                cout << state << endl;
+            }
+            current = current->getNext();
+        }
+    }
+
+    // Универсальная фильтрация государств по произвольному условию
+    void printStatesByCondition(function<bool(const State&)> condition) {
+        Element<State>* current = stateList.getHead();
+        while (current != nullptr) {
+            const State& state = current->getInfo();
+            if (condition(state)) {
+                cout << state << endl;
+            }
+            current = current->getNext();
+        }
+    }
+
+    // Сохранение списка состояний в файл
+    void save(const string& filename) const {
+        ofstream outputFile(filename);
+        if (!outputFile.is_open()) {
+            throw runtime_error("Unable to open file for writing");
+        }
+
+        Element<State>* current = stateList.getHead();
+        while (current != nullptr) {
+            outputFile << current->getInfo().getName() << ","
+                << current->getInfo().getCapital() << ","
+                << current->getInfo().getLanguage() << ","
+                << current->getInfo().getPopulation() << ","
+                << current->getInfo().getArea() << endl;
+            current = current->getNext();
+        }
+
+        outputFile.close();
+    }
+
+    // Загрузка списка состояний из файла
+    void load(const string& filename) {
+        ifstream file(filename);
+        if (file.is_open()) {
+            // Очищаем текущий список состояний перед загрузкой новых данных
+            while (!stateList.isEmpty()) {
+                stateList.pop();
+            }
+
+            string line;
+            while (getline(file, line)) {
+                stringstream ss(line);
+                string name, capital, language;
+                long population;
+                double area;
+                getline(ss, name, ',');
+                getline(ss, capital, ',');
+                getline(ss, language, ',');
+                ss >> population;
+                ss.ignore(1); // Ignore the comma
+                ss >> area;
+                State state(name, capital, language, population, area);
+                stateList.push(state);
+            }
+            file.close();
+        }
+        else {
+            cout << "Unable to open file for loading" << endl;
+        }
+    }
+};
+
+
+
 int main() {
     DoublyLinkedStack<int> stack;
 
@@ -388,9 +587,21 @@ int main() {
         cout << "Element with value 99 not found" << endl;
     }
 
+    found = stack.find_recursive(3, static_cast<DoublyLinkedElement<int>*>(stack.head));
+    if (found) {
+        cout << "Found element with value 3 using recursive find: " << found->getInfo() << endl;
+    }
+    else {
+        cout << "Element with value 3 not found using recursive find" << endl;
+    }
+
     cout << "Filtering elements greater than 2: ";
     stack.filter([](const int& value) { return value > 2; });
 
+    cout << "Filtering elements greater than 2 using recursive filter: ";
+    stack.filter_recursive([](const int& value) { return value > 2; }, static_cast<DoublyLinkedElement<int>*>(stack.head));
+    cout << endl;
+
     cout << "Element at index 1: " << stack[1] << endl;
 
     while (!stack.isEmpty()) {
@@ -402,5 +613,54 @@ int main() {
     }
     cout << endl;
 
+
+    StateList* states = new StateList();
+ 
+    //for 6.2
+    states->push(State("USA", "Washington D.C.", "English", 328000000, 9833510));
+    states->push(State("India", "New Delhi", "Hindi", 1380000000, 3287263));
+
+    // Сохраняем список состояний в файл
+    states->save("states.txt");
+
+    // Загружаем список состояний из файла
+    StateList loadedStates;
+    loadedStates.load("states.txt");
+
+    cout << "List of states:" << endl;
+    //cout << states->findStateByName("USA") << endl;
+    cout << loadedStates << endl;
+
+    cout << "States with area between 9800500 and 9987263:" << endl;
+    states->printStatesByArea(9800500, 9987263);
+
+    cout << "States with population greater than 1 billion:" << endl;
+    states->printStatesByCondition([](const State& state) 
+        {
+        return state.getPopulation() > 1000000000;
+        });
+
+    State* foundState = states->findStateByName("USA");
+    if (foundState) {
+        cout << "Found state: " << *foundState << endl;
+    }
+    else {
+        cout << "State not found" << endl;
+    }
+
+    try {
+        State removedState = states->removeState();
+        cout << "Removed state: " << removedState << endl;
+    }
+    catch (const out_of_range& e) {
+        cout << e.what() << endl;
+    }
+
+    cout << "States after removal:" << endl;
+    states->printStatesByArea(0, 10000000);
+
+    // Освобождение памяти, выделенной для объекта StateList
+    delete states;
+
     return 0;
 }