done #1

src/Motorradvermietung.cpp

@@ -4,6 +4,38 @@
 
 using namespace std;
 
+/**
+ * \brief ask a question and get a answer.
+ * \tparam T return parameter
+ * \param question the question.
+ * \return the value.
+ */
+template <typename T>
+T ask_question(const string& question)
+{
+    cout << question << ": ";
+    T value;
+    cin >> value;
+    return value;
+}
+
+bool ask_question(const string& question)
+{
+    while (true)
+    {
+        const auto answer = ask_question<char>(question + " (J/N)");
+        if (answer == 'j' || answer == 'J')
+        {
+            return true;
+        }
+        if (answer == 'n' || answer == 'N')
+        {
+            return false;
+        }
+        cout << "Ungueltige Eigabe. Bitte noch einmal versuchen!";
+    }
+}
+
 class address final
 {
 private:
@@ -34,6 +66,15 @@ public:
         istr >> address.city_;
         return istr;
     }
+
+    friend ostream& operator<<(ostream& ostr, const address& customer)
+    {
+        ostr << "Strasse: " << customer.street_ << endl;
+        ostr << "Hausnummer: " << customer.street_no_ << endl;
+        ostr << "Postleitzahl: " << customer.postal_code_ << endl;
+        ostr << "Ort: " << customer.city_ << endl;
+        return ostr;
+    }
 };
 
 class reservation final
@@ -57,9 +98,7 @@ private:
     string phone_no_;
     bool has_driving_license_ = false;
 public:
-    customer()
+    customer() = default;
-    {
-    }
 
     customer(string&& name, string&& first_name, address&& address, unsigned short&& year_of_birth, string&& phone_no,
              bool&& has_driving_license) : name_(name),
@@ -82,32 +121,22 @@ public:
         istr >> customer.address_;
         cout << "Telefonnumer: ";
         istr >> customer.phone_no_;
-        cout << "Fuehrerschein der Klasse A? (J/N): ";
+        customer.has_driving_license_ = ask_question("Fuehrerschein der Klasse A?");
-        char driving_license;
-        istr >> driving_license;
-        if (driving_license == 'j' || driving_license == 'J')
-        {
-            customer.has_driving_license_ = true;
-        }
         return istr;
     }
+
+    friend ostream& operator<<(ostream& ostr, const customer& customer)
+    {
+        ostr << "Name: " << customer.name_ << endl;
+        ostr << "Vorname: " << customer.first_name_ << endl;
+        ostr << "Geburtsjahr: " << customer.year_of_birth_ << endl;
+        ostr << customer.address_;
+        ostr << "Telefonnummer: " << customer.phone_no_ << endl;
+        ostr << "Fuehrerschein " << (customer.has_driving_license_ ? "" : "nicht ") << "vorhanden." << endl;
+        return ostr;
+    }
 };
 
-/**
- * \brief ask a question and get a answer.
- * \tparam T return parameter
- * \param question the question.
- * \return the value.
- */
-template <typename T>
-T ask_question(const string& question)
-{
-    cout << question << endl;
-    cout << "> ";
-    T value;
-    cin >> value;
-    return value;
-}
 
 void create_customer();
 void create_reservation();
@@ -122,7 +151,8 @@ int main()
     while (true)
     {
         system("cls");
-        cout << "Motorradvermietung (" << reservations.size() << " Reservierungen)" << endl << endl;
+        cout << "Motorradvermietung (" << reservations.size() << " Reservierungen; " << customers.size() << " Kunden)"
+            << endl << endl;
         cout << "Bitte w\x84hlen Sie eine Option:" << endl;
         cout << "1: Neuen Kunden anlegen" << endl;
         cout << "2: Erstellen einer Reservierung" << endl;
@@ -130,7 +160,7 @@ int main()
         cout << "4: Reservierungen exportieren" << endl;
         cout << endl;
         cout << "0: Programm beenden" << endl;
-        const auto input = ask_question<int>("Ihre Eingabe:");
+        const auto input = ask_question<int>("Ihre Eingabe");
 
         switch (input)
         {
@@ -157,13 +187,22 @@ int main()
 
 void create_customer()
 {
-    system("cls");
+    while (true)
-    cout << "Neuen Kunden anlegen" << endl;
+    {
-    cout << "------------------------------------" << endl;
+        system("cls");
+        cout << "Neuen Kunden anlegen" << endl;
+        cout << "------------------------------------" << endl;
 
-    customer customer;
+        customer customer;
-    cin >> customer;
+        cin >> customer;
-    customers.push_back(customer);
+        cout << endl << endl;
+        cout << customer;
+        if (ask_question("Angaben korrekt?"))
+        {
+            customers.push_back(customer);
+            return;
+        }
+    }
 }
 
 void create_reservation()