C++定义类析构函数的问题 内部cout不输出

Question

我定义了Date类型 析构函数~Date() 并且在析构函数内有cout << "Destructor run" << endl;
但是程序运行却没有出现Destructor run这句话的输出
这是咋回事 不会改了

#include<iostream>
using namespace std;
int const monthDay[12]={31,28,31,30,31,30,31,31,30,31,30,31};
char* const weekName[7]={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
char* const monthName[12]={"Jan","Feb","Mar","Api","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
class Date
{
private:
    int day;
    int month;
    int year;
public:
    ~Date();
    Date(int day=1,int month=1,int year=1);
    Date(Date &);
    void  setDay(int );
    int  getDay();
    void  setMonth(int );
    int  getMonth();
    void  setYear(int );
    int  getYear();
    void  tomorrow( );
    void  yesterday( );
    void  chineseFormat( );
    void  americaformat( );
};
Date:: Date(int day,int month,int year)
{
    cout << "Constructor run" << endl;
}
Date:: Date(Date &n)
{
    cout << "CopyConstructor run" << endl;
}
void Date:: setDay(int Day)
{
    day=Day;
}
int Date:: getDay()
{
    return day;
}
void Date:: setMonth(int Month)
{
    month=Month;
}
int Date:: getMonth()
{
    return month;
}
void Date:: setYear(int Year)
{
    year=Year;
}
int Date:: getYear()
{
    return year;
}
void Date:: tomorrow( )
{
    day++;
    if(day>=32)
    {
        day=1;
        month+=1;
    }
}
void Date:: yesterday( )
{
    day--;
    if(day<=0)
    {
        day=1;
        month-=1;
    }
}
void Date:: chineseFormat( )
{
    cout<<year<<"nian"<<month<<"yue"<<day<<"ri"<<endl;
}
void Date:: americaformat( )
{
    cout<<monthName[month-1]<<" "<<day<<","<<year<<endl;
}
Date:: ~Date()
{
    cout << "Destructor run" << endl;
}
int main()
{
    int year,month,day;
    Date d1;
    Date d2(d1);
    cin>>year>>month>>day;
    d1.setYear(year);
    d1.setMonth(month);
    d1.setDay(day);
    d1.yesterday();
    d1.chineseFormat();
    cin>>year>>month>>day;
    d2.setYear(year);
    d2.setMonth(month);
    d2.setDay(day);
    d2.tomorrow();
    d2.americaformat();
    //d2.printMonthCalendar();
    system("pause");
    return 0;
}

Answer 1

107行system("pause")执行时，程序尚未结束，d2对象还没有释放，自然不会执行析构代码了。
要想看析构效果，你可以定义类的指针变量，new一个对象，再调用delete释放指针就会执行析构了