almost done. comments are missing

src/Motorradvermietung.cpp

@@ -1,9 +1,9 @@
 #include <iostream>
-#include <string>
 #include <list>
 #include <vector>
-#include <fstream>
 #include <ctime>
+#include <string>
+#include <fstream>
 
 using namespace std;
 
@@ -42,26 +42,49 @@ bool ask_question(const string& question)
     }
 }
 
+auto int_to_string(const unsigned int value, const unsigned int numbers = 0) -> string
+{
+    auto str = to_string(value);
+    const auto len = numbers > str.length() ? numbers - str.length() : 0;
+    for (unsigned int i = 0; i < len; ++i)
+    {
+        str.insert(0, "0");
+    }
+    return str;
+}
+
 class date final
 {
 private:
     unsigned short day_;
     unsigned short month_;
     unsigned short year_;
+    int sum_;
+
+    int day_number_from_date() const
+    {
+        const auto month = (month_ + 9) % 12;
+        const auto year = year_ - month / 10;
+        return 365 * year + year / 4 - year / 100 + year / 400 + (month * 306 + 5) / 10 + (day_ - 1);
+    }
+
 public:
     date(const unsigned short day, const unsigned short month, const unsigned short year) : day_(day), month_(month),
                                                                                             year_(year)
     {
+        sum_ = day_number_from_date();
     }
 
     int get_sum() const
     {
-        return year_ + month_ + day_;
+        return sum_;
     }
 
     friend ostream& operator<<(ostream& ostr, const date& date)
     {
-        ostr << date.day_ << "." << date.month_ << "." << date.year_;
+        ostr << int_to_string(date.day_, 2) << "."
+            << int_to_string(date.month_, 2) << "."
+            << int_to_string(date.year_, 4);
         return ostr;
     }
 };
@@ -161,12 +184,17 @@ public:
 
     string get_name() const
     {
-        return this->name_;
+        return name_;
     }
 
     string get_first_name() const
     {
-        return this->first_name_;
+        return first_name_;
+    }
+
+    bool get_has_driving_license() const
+    {
+        return has_driving_license_;
     }
 };
 
@@ -219,6 +247,11 @@ public:
     {
         return id_;
     }
+
+    bool get_cancellation() const
+    {
+        return canceled_;
+    }
 };
 
 string motorcycles[] =
@@ -419,6 +452,12 @@ void create_reservation()
         system("pause");
         return;
     }
+    if(!current->get_has_driving_license())
+    {
+        cout << "Der Kunde hat keinen entsprechenden Fuehrerschein." << endl;
+        system("pause");
+        return;
+    }
     const auto start_date = get_validated_date("Startdatum");
     const auto end_date = get_validated_date("Enddatum");
     const auto motorcycle = select_motorcycle();
@@ -478,17 +517,6 @@ void rent_a_motorcycle()
     system("pause");
 }
 
-auto int_to_string(const int value, const unsigned int numbers = 0) -> string
-{
-    auto str = to_string(value);
-    const auto len = numbers - str.length();
-    for (unsigned int i = 0; i < len; ++i)
-    {
-        str.insert(0, "0");
-    }
-    return str;
-}
-
 string current_date_time()
 {
     auto t = time(nullptr);
@@ -509,13 +537,16 @@ void export_reservations()
     ofstream f;
     f.open("reservierungen.txt", ios::app);
     f << "Export (" << current_date_time() << ")" << endl;
+    f << "Id;Motorcycle;Start;End;Name;First_Name;Cancelled" << endl;
     for (auto reservation : reservations)
     {
-        f << reservation->get_id() << ". ";
+        f << reservation->get_id() << ";";
-        f << motorcycles[reservation->get_motorcycle()] << " ";
+        f << motorcycles[reservation->get_motorcycle()] << ";";
-        f << reservation->get_start_date() << " - " << reservation->get_end_date() << " ";
+        f << reservation->get_start_date() << ";";
-        f << reservation->get_customer()->get_first_name() << " " << reservation->get_customer()->get_name();
+        f << reservation->get_end_date() << ";";
-        f << endl;
+        f << reservation->get_customer()->get_name() << ";";
+        f << reservation->get_customer()->get_first_name() << ";";
+        f << (reservation->get_cancellation() ? "True" : "False") << endl;
     }
     f << "------------" << endl;
     f.close();