#include <cstdio> #include <iostream> using namespace std; //基類A class A{ public:A(int a, int b);public:int m_a;int m_b; }; A::A(int a, int b): m_a(a), m_b(b){ } //基類B class B{ public:B(int b, int c);public:int m_b;int m_c; }; B::B(int b, int c): m_b(b), m_c(c){ } //派生類C class C: public A, public B{ public:C(int a, int b, int c, int d); public:void display();public:int m_a;int m_c;int m_d; }; C::C(int a, int b, int c, int d): A(a, b), B(b, c), m_a(a), m_c(c), m_d(d){ } void C::display(){printf("A::m_a=%d, A::m_b=%d\n", A::m_a, A::m_b);printf("B::m_b=%d, B::m_c=%d\n", B::m_b, B::m_c);printf("C::m_a=%d, C::m_c=%d, C::m_d=%d\n", C::m_a, C::m_c, m_d); } int main(){C obj_c(10, 20, 30, 40);obj_c.display();cout<<"&obj_c.A::m_a="<<&obj_c.A::m_a<< " &obj_c.A::m_b="<<&obj_c.A::m_b<<"\n";cout<< "&obj_c.B::m_b="<<&obj_c.B::m_b<<" &obj_c.B:m_c="<<&obj_c.B::m_c<<"\n";//cout<<"&obj_c.C::m_a="<<&obj_c.C::m_a<<" &obj_c.m_c="<<&obj_c.C::m_c<<" &obj_c.C::m_d="<<&obj_c.C::m_d<<" &obj_c="<<&obj_c<<endl;cout<<"&obj_c.m_a="<<&obj_c.m_a<<" &obj_c.m_c="<<&obj_c.m_c<<" &obj_c.m_d="<<&obj_c.m_d<<" &obj_c="<<&obj_c<<endl;return 0; } A::m_a=10, A::m_b=20 B::m_b=20, B::m_c=30 C::m_a=10, C::m_c=30, C::m_d=40 &obj_c.A::m_a=0x7ffe5583e970 &obj_c.A::m_b=0x7ffe5583e974 &obj_c.B::m_b=0x7ffe5583e978 &obj_c.B:m_c=0x7ffe5583e97c &obj_c.m_a=0x7ffe5583e980 &obj_c.m_c=0x7ffe5583e984 &obj_c.m_d=0x7ffe5583e988 &obj_c=0x7ffe5583e970

A、B 是基類，C 是派生類，假設(shè) obj_c 的起始地址是 0X1000，那么 obj_c 的內(nèi)存分布如下圖所示：

基類對象的排列順序和繼承時聲明的順序相同。

總結(jié)

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