C++文件操作，写一个类的对象到文件再读出。

星月交辉

#include <iostream>
#include <string>
#include <fstream>
using namespace std;
class Flight
{
public:
    Flight(){}
        void setFlight_num(int flight_num) { this->flight_num=flight_num;}
        int showFlight_num () const {return flight_num;}
    void setMax_num_of_passengers(int max_num_of_passengers)
        {
                this->max_num_of_passengers = max_num_of_passengers;
        }
    int showMax_num_of_passengers () const {return max_num_of_passengers;}
    void setTake_off_place(string &t_off_place) { take_off_place=t_off_place;}
        string& showTake_off_place() {return take_off_place;}
        void setTake_off_time(string &t_off_time) {take_off_time=t_off_time;}
        string& showTake_off_time() {return take_off_time;}
        void setLanding_place(string &l_place) {landing_place=l_place;}
        string& showLanding_place() {return landing_place;}
        void setLanging_time(string &l_time) {langing_time=l_time;}
        string& showLanging_time() {return langing_time;}
        void setPrice(double price) {this->price=price;}
        double showPrice()const {return price;}
private:
        int flight_num;
        int max_num_of_passengers;
        string take_off_place;
        string take_off_time;
        string landing_place;
        string langing_time;
        double price;
};
void Input(int n)
{
        Flight flight;
        int flight_num,max_num,i=0;
        string take_off_place,take_off_time,landing_place,langing_time;
        double price;
    ofstream fout("航班信息",ios::app|ios::binary);
    if(!fout)
        {
                cout<<"不能打开文件!"<<endl;                       
        }
        while(i<n)
        {
                i++;
                cout<<"请输入:航班号 最大载客数 起飞地点 起飞时间 降落地点 降落时间 单价\n";
                cin>>flight_num;               
                cin>>max_num;       
                cin>>take_off_place;               
                cin>>take_off_time;       
                cin>>landing_place;               
                cin>>langing_time;               
        cin>>price;
        flight.setFlight_num(flight_num);
                flight.setMax_num_of_passengers(max_num);
                flight.setTake_off_place(take_off_place);
                flight.setTake_off_time(take_off_time);
                flight.setLanding_place(landing_place);
                flight.setLanging_time(langing_time);
                flight.setPrice(price);                       
                fout.write((char*)&flight,sizeof flight);
        }
        fout.close();
        cout<<"所有航班记录输入结束!"<<endl;
}
int main()
{
        int n;
        Flight flight1;
        cout<<"输入现有航班总数:";
        cin>>n;
        Input(n);
        ifstream fin("航班信息",ios::in|ios::binary);
        if(!fin)
        {
                cout<<"不能打开文件!"<<endl;
        }
        for(int i=0;i<n;i++)
        {
                fin.read((char*)&flight1,sizeof flight1);                                               
                cout<<flight1.showLanging_time()<<endl;
                cout<<flight1.showTake_off_place()<<endl;
                cout<<flight1.showFlight_num()<<endl;
        }
        fin.close();
        return 0;
}
为什么会有乱码输出？