save();load(); fix for printing "list of states".

pr6.cpp

@@ -1,6 +1,9 @@
 #include <iostream>
 #include <stdexcept>
 #include <functional>
+#include <fstream>
+#include <sstream>
+#include <string>
 
 using namespace std;
 
@@ -421,6 +424,9 @@ public:
     void addState(const State& state) {
         stateList.push(state);
     }
+    Element<State>* getStateListHead() const {
+        return stateList.getHead();
+    }
 
     // Удаление государства из начала списка
     State removeState() {
@@ -442,7 +448,6 @@ public:
             }
             current = current->getNext();
         }
-        /*throw logic_error("State not found");*/
         return nullptr;
     }
 
@@ -469,6 +474,57 @@ public:
             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;
+        }
+    }
 };
 
 
@@ -530,8 +586,24 @@ int main() {
     states->addState(State("USA", "Washington D.C.", "English", 328000000, 9833510));
     states->addState(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 << states->findStateByName("USA") << endl;
+    Element<State>* current = states->getStateListHead();
+    while (current != nullptr) {
+        if (current->getInfo().getName() != "") {
+            cout << "State: " << current->getInfo().getName() << ", Capital: " << current->getInfo().getCapital()
+                << ", Language: " << current->getInfo().getLanguage() << ", Population: " << current->getInfo().getPopulation()
+                << ", Area: " << current->getInfo().getArea() << endl;
+        }
+        current = current->getNext();
+    }
 
     cout << "States with area between 9800500 and 9987263:" << endl;
     states->printStatesByArea(9800500, 9987263);