VC++深入详解：类的继承[图](3)
} void eat() { cout"animal eat"endl; } void sleep() { cout"animal sleep"endl; } void breathe() { cout"animal breathe"endl; } }; class fish:public animal { public: fish() { cout"fish construct"endl; }
}
void eat()
{
cout<<"animal eat"<<endl;
}
void sleep()
{
cout<<"animal sleep"<<endl;
}
void breathe()
{
cout<<"animal breathe"<<endl;
}
};
class fish:public animal
{
public:
fish()
{
cout<<"fish construct"<<endl;
}
~fish()
{
cout<<"fish destruct"<<endl;
}
};
void main()
{
fish fh;
}
void eat()
{
cout<<"animal eat"<<endl;
}
void sleep()
{
cout<<"animal sleep"<<endl;
}
void breathe()
{
cout<<"animal breathe"<<endl;
}
};
class fish:public animal
{
public:
fish()
{
cout<<"fish construct"<<endl;
}
~fish()
{
cout<<"fish destruct"<<endl;
}
};
void main()
{
fish fh;
}
编译运行，出现如图2.11所示的结果。
可以看到当构造fish类的对象fh时，animal类的构造函数也要被调用，而且在fish类的构造函数调用之前被调用。当然，这也很好理解，没有父亲就没有孩子，因为fish类从animal类继承而来，所以在fish类的对象构造之前，animal类的对象要先构造。在析构时，正好相反。
图2.11 EX06.CPP程序的运行结果
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