printStatesByCondition

pr6.cpp

@@ -401,6 +401,10 @@ public:
     // 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; }
+
 };
 
 
@@ -449,8 +453,22 @@ public:
             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();
+        }
+    }
 };
 
+
+
 int main() {
     DoublyLinkedStack<int> stack;
 
@@ -516,8 +534,14 @@ int main() {
     //cout << "Removing state:" << endl;
     //cout << stateList.removeState() << endl;
 
-    cout << "States with area between 2000 and 3000:" << endl;
-    states.printStatesByArea(2000, 3000);
+    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) {
@@ -536,9 +560,7 @@ int main() {
     }
 
     cout << "States after removal:" << endl;
-    states.printStatesByArea(0, 10000);
-
-
+    states.printStatesByArea(0, 10000000);
 
     return 0;
 }