输出结果和书上的不一样，求解(新手不知道如何累积点数，20点是我的家底，还望各位海涵)

目前正在自学c++,照著书中范例打完如下
#include<iostream>
using namespace std;
class Time                                                                                          
{     
    public:
        Time();
        Time(int,int,int);
        void settime(int,int,int);
        void sethour(int);
        void setminute(int);
        void setsecond(int);
        void printtime();
        ~Time();
    private:                              
        int hour;
        int minute;
        int second;
        
};

Time::Time()  
{
   
    cout<<"call constructor."<<endl;
    hour=minute=second=0;
}

Time::Time(int h,int m,int s)   
{         
    cout<<"call constructor with reference."<<endl;
    hour=(h>0&&h<24)?h:0;
    minute=(m>0&&m<60)?m:0;
    second=(s>0&&s<60)?s:0;
}

void Time::settime(int h,int m,int s)
{
    hour=(h>0&&h<24)?h:0;
    minute=(m>0&&m<60)?m:0;
    second=(s>0&&s<60)?s:0;
}

void Time::sethour(int h)
{hour=(h>0&&h<24)?h:0;}
void Time::setminute(int m)
{minute=(m>0&&m<60)?m:0;}
void Time::setsecond(int s)
{second=(s>0&&s<60)?s:0;}
void Time::printtime()
{cout<<(hour<10?"0":"")<<hour<<":"<<(minute<10?"0":"")<<minute<<
 ":"<<(second<10?"0":"")<<second<<endl;}
Time::~Time()
{cout<<"call destructor!"<<endl;}

int main()
{
    Time t1,t2(13,20,25);
   
    cout<<"t1 is:";
    t1.printtime();
    cout<<"t2 is:";
    t2.printtime();
   
    t1.settime(13,30,0);
    cout<<"reset t1 is:";
    t1.printtime();
   
    t2.sethour(8);
    cout<<"reset t2 is:";
    t2.printtime();
   
    return 0;
}
输出结果应为:
call constructor.
call constructor with reference.
t1 is:00:00:00
t2 is:13:20:25
reset t1 is:13:30:00
reset t2 is:08:20:25

可是我自己执行的结果是:
call constructor.
call constructor with reference.
t1 is:00:00:00
t2 is:13:20:25
reset t1 is:13:30:00
reset t2 is:08:20:25
call destructor!
call destructir!

本以为把
Time::~Time()
{cout<<"call destructor!"<<endl;}
删除之后即可
结果删除之后根本无法执行
这又是为什么呢?

[此贴子已经被作者于2016-5-30 16:37编辑过]