每天干这个 看懂了木？

#include<iostream.h>
class B{
public:
B();
B(int i);
~B();
void Print() const;
private:
int b;
};
B::B()
{ b=0;
cout<<"B's default constructor called."<<endl;
}
B::B(int i)
{ b=i;
cout<<"B's constructor called." <<endl;
}
B::~B()
{ cout<<"B's destructor called."<<endl; }
void B::Print() const
{ cout<<b<<endl; }
class C:public B
{
public:
C();
C(int i,int j);
~C();
void Print() const;
private:
int c;
};
C::C()
{ c=0;
cout<<"C's default constructor called."<<endl;
}
C::C(int i,int j):B(i)
{ c=j;
cout<<"C's constructor called."<<endl;
}
C::~C()
{ cout<<"C's destructor called."<<endl; }
void C::Print() const
{ B::Print(); cout<<c<<endl; }
void main()
{ C obj(5,6); obj.Print(); }