C++，C++/CX に挑戦！

    struct tm {
        int  tm_sec;    // 秒
        int  tm_min;    // 分
        int  tm_hour;   // 時
        int  tm_mday;   // 日
        int  tm_mon;    // 月（ 1月…0 〜 12月…11 ）
        int  tm_year;   // 1900年からの年数
        int  tm_wday;   // 曜日（ 日曜…0 〜 土曜…6 ）
        int  tm_yday;   // 1月1日からの日数（ 0 〜 355 ）
        int  tm_isdst;  // 夏時間フラグ
    };

    time_t current = time(NULL);
    struct tm* timer = localtime(&current);
    char* wday_name[] = {"日", "月", "火", "水", "木", "金", "土"};

    cout << "現在の日付・時刻"
         << timer->tm_year + 1900     << "年"
         << timer->tm_mon + 1         << "月"
         << timer->tm_mday            << "日（"
         << wday_name[timer->tm_wday] << "）"
         << timer->tm_hour            << "時"
         << timer->tm_min             << "分"
         << timer->tm_sec             << "秒\n";


※ struct tm* timer はポインタなので、例えば、構造体のデータメンバ tm_sec にアクセスする場合は

    ◆ (*timer).tm_sec

    ◆ timer->tm_sec

のように記述します。

// Date.h
#ifndef ___Class_Date
#define ___Class_Date

#include <string>
#include <iostream>

class Date {
    int y;
    int m;
    int d;

public:
    Date();
    Date(int yy, int mm = 1, int dd = 1);

    int year()  const { return y; }
    int month() const { return m; }
    int day()   const { return d; }
    std::string day_of_week() const;
    Date preceding_day() const;
    std::string to_string() const;
};

std::ostream& operator<<(std::ostream& s, const Date& x);
std::istream& operator>>(std::istream& s, Date& x);

#endif

// Date.cpp
#define _CRT_SECURE_NO_WARNINGS
#include <iomanip>
#include <ctime>
#include <sstream>
#include <iostream>
#include "Date.h"
using namespace std;

Date::Date() {
    time_t current = time(NULL);
    struct tm* local = localtime(&current);
    y = local->tm_year + 1900;
    m = local->tm_mon + 1;
    d = local->tm_mday;
}

Date::Date(int yy, int mm, int dd) {
    y = yy;
    m = mm;
    d = dd;
}

string Date::day_of_week() const {
    string dw[] = { "日" ,"月", "火", "水", "木", "金", "土" };
    int yy = y; int mm = m;
    if (mm == 1 || mm == 2) {
        yy--;
        mm += 12;
    }
    return dw[(yy + yy / 4 - yy / 100 + yy / 400 + (13 * mm + 8) / 5 + d) % 7];
}

Date Date::preceding_day() const {
    int dmax[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
    Date temp = *this;

    if (temp.d > 1)
        temp.d--;
    else {
        if (--temp.m < 1) {
            temp.y--;
            temp.m = 12;
        }
        temp.d = dmax[temp.m - 1];
    }
    return temp;
}

string Date::to_string() const {
    ostringstream s;
    s << setfill('0') << y << "年"
      << setw(2)      << m << "月"
      << setw(2)      << d << "日"
      << "(" << day_of_week() << ")";
    return s.str();
}

ostream& operator<<(ostream& s, const Date& x) {
    return s << x.to_string();
}

istream& operator>>(istream& s, Date& x) {
    int y, m, d; char c;
    s >> y >> c >> m >> c >> d;
    x = Date(y, m, d);
    return s;
}

// Car.h
#ifndef ___Class_Car
#define ___Class_Car

#include <cmath>
#include <string>
#include <iostream>
#include "Date.h"

class Car {
    std::string name, number;
    int width, length, height;
    double tank_capa, km_p_L;
    double fuel_level;
    double xp, yp;
    Date purchase_d;

public:
    Car(std::string num, std::string nam, int w, int l, int h,
                                    double t, double km, const Date& d)
        : name(nam), number(num), width(w), length(l), height(h),
                                tank_capa(t), km_p_L(km), purchase_d(d)
    {
        fuel_level = 0.0; xp = yp = 0.0;
    }

    void print_spec() const {
        std::cout << "【スペック】" << '\n';
        std::cout << "------------" << '\n';
        std::cout << "名前：" << name << '\n';
        std::cout << "車幅：" << width << "mm\n";
        std::cout << "車長：" << length << "mm\n";
        std::cout << "車高：" << height << "mm\n";
        std::cout << "タンク容量：" << tank_capa << "L\n";
        std::cout << "燃費：" << km_p_L << "km/L\n";
        std::cout << "------------" << '\n';
        std::cout << "  " << number << '\n';
        std::cout << "  " << purchase_date() << "購入\n\n";
    }

    Date purchase_date() const { return purchase_d; }

    bool refueling(double gas) {
        if (fuel_level + gas > tank_capa) {
            fuel_level = tank_capa;
            return false;
        }
        else {
            fuel_level += gas;
            return true;
        }
    }

    void print_situation() const {
        std::cout << "・現在地 x：" << xp << "km  y：" << yp << "km\n";
        std::cout << "・燃料残量：" << fuel_level << "L" << '\n';
    }

    bool move(double dx, double dy) {
        double dist = sqrt(dx * dx + dy * dy);
        if (dist > fuel_level * km_p_L)
            return false;
        else {
            fuel_level -= dist / km_p_L;
            xp += dx;
            yp += dy;
            return true;
        }
    }
};

#endif

// CarTest.cpp
#include <iostream>
#include "Car.h"
using namespace std;

int main()
{
    Car myCar("横浜012-3456", "ランドクルーザー", 1980, 4950, 1870,
                                                    90, 6.6, Date(2017,10,25));
    myCar.print_spec();

    while (true) {
        myCar.print_situation();
        cout << '\n';
        int move;
        cout << "[ 0…到着 ／1…移動 ／2…給油 ]："; cin >> move;
        if (move == 0) break;
        if (move == 2) {
            double gas;
            do {
                cout << "給油量[L]："; cin >> gas;
            } while (gas < 0);
            if (!myCar.refueling(gas))
                cout << "\a燃料が多過ぎます！\n満タンまで入れました。\n";
        }
        else {
            double dx, dy;
            cout << "Ｘ方向の移動距離[km]：";  cin >> dx;
            cout << "Ｙ方向の移動距離[km]：";  cin >> dy;
            if (!myCar.move(dx, dy)) {
                cout << "\a燃料が不足！\n";
            }
        }
    }
}