#include <cstdio>
#include<iostream>
using namespace std;
//基类A
class A{
public:
A(int a, int b);
public:
void display();
public:
int m_a;
int m_b;
};
A::A(int a, int b): m_a(a), m_b(b){}
void A::display(){
printf("m_a=%d, m_b=%d\n", m_a, m_b);
}
//派生类B
class B: public A{
public:
B(int a, int b, int c);
void display();
public:
int m_c;
};
B::B(int a, int b, int c): A(a, b), m_c(c){ }
void B::display(){
printf("m_a=%d, m_b=%d, m_c=%d\n", m_a, m_b, m_c);
}
//声明并定义派生类C
class C: public B{
public:
C(char a, int b, int c, int d);
public:
void display();
public:
int m_b; //遮蔽A类的成员变量
int m_c; //遮蔽B类的成员变量
int m_d; //新增成员变量
};
C::C(char a, int b, int c, int d): B(a, b, c), m_b(b), m_c(c), m_d(d){ }
void C::display(){
printf("A::m_a=%d, A::m_b=%d, B::m_c=%d\n", m_a, A::m_b, B::m_c);
printf("C::m_b=%d, C::m_c=%d, C::m_d=%d\n", m_b, m_c, m_d);
}
int main(){
A obj_a(99, 10);
B obj_b(84, 23, 95);
cout<<"&obj_a.m_a="<<&obj_a.m_a<<" &obj_a.m_b="<<&obj_a.m_b<<" &obj_a="<<&obj_a<<endl;
cout<<"&obj_b.m_a="<<&obj_b.m_a<<" &obj_b.m_b="<<&obj_b.m_b<<" &obj_b.m_c="<<&obj_b.m_c<<" &obj_b="<<&obj_b<<endl;
obj_a.display();
//创建C类对象obj_c
C obj_c(84, 23, 95, 60);
obj_c.display();
cout<<"&obj_c.m_a="<<&obj_c.m_a<< " &obj_c.A::m_b="<<&obj_c.A::m_b<< " &obj_c.B::m_c="<<&obj_c.B::m_c<<" &obj_c.m_b="<<&obj_c.m_b<<" &obj_c.m_c="<<&obj_c.m_c<<" &obj_c.m_d="<<&obj_c.m_d<<" &obj_c="<<&obj_c<<endl;
obj_c.display();
obj_b.display();
return 0;
}
&obj_a.m_a=0x7fffc1edf9dc &obj_a.m_b=0x7fffc1edf9e0 &obj_a=0x7fffc1edf9dc
&obj_b.m_a=0x7fffc1edf9e4 &obj_b.m_b=0x7fffc1edf9e8 &obj_b.m_c=0x7fffc1edf9ec &obj_b=0x7fffc1edf9e4
m_a=99, m_b=10
A::m_a=84, A::m_b=23, B::m_c=95
C::m_b=23, C::m_c=95, C::m_d=60
&obj_c.m_a=0x7fffc1edf9f0 &obj_c.A::m_b=0x7fffc1edf9f4 &obj_c.B::m_c=0x7fffc1edf9f8 &obj_c.m_b=0x7fffc1edf9fc &obj_c.m_c=0x7fffc1edfa00 &obj_c.m_d=0x7fffc1edfa04 &obj_c=0x7fffc1edf9f0
A::m_a=84, A::m_b=23, B::m_c=95
C::m_b=23, C::m_c=95, C::m_d=60
m_a=84, m_b=23, m_c=95
假设 obj_c 的起始地址为 0X1300,那么它的内存分布如下图所示