//private：除了本身類內 其余類不可調用
//protected：本身與派生類可以調用
//public：都可以調用
//例程

#include <iostream> #include <string> #include <windows.h>using namespace std;class people { private:string m_name;int m_age;public:void setpeople(string name, int age);void showinfo(); };void people::setpeople(string name, int age) {m_name = name;m_age = age; }void people::showinfo() {cout << "名字是：" << m_name << endl;cout << "年齡是：" << m_age << endl; }class student : public people { private:int m_id; public:void setid(int id);void print(); };void student::setid(int id) {m_id = id; }void student::print() {cout << "學號是：" << m_id << endl; }int main() {student s1;s1.setpeople("tqn", 21);s1.setid(202150225);s1.showinfo();s1.print();system("pause");return 0; }

//地址分配上 先分配繼承來的 后分配自己聲明的

#include <iostream>#include <windows.h>using namespace std;class A { public:int m_a;int m_b;A();~A(); }; A::A() {cout << "constuctor A ok~" << endl; }A::~A() {cout << "destuct A ok~" << endl; }class B :public A { public:int m_c;B();~B(); };B::B() {cout << "constuctor B ok~" << endl; } B::~B() {cout << "destuct B ok~" << endl; }int main() {B b1;cout << &b1.m_a << endl;cout << &b1.m_b << endl; cout << &b1.m_c << endl;system("pause");return 0; }

//初始化的時候 構造的順序是 父類 --> 成員 --> 自己 這個是語法規定的 沒有為什么

#include <iostream>#include <windows.h>using namespace std;class A { public:int m_a;int m_b;A(int a);~A();void printA(); }; A::A(int a) {cout << "constuctor A ok~" << endl;m_a = a; }A::~A() {cout << "destuct A ok~" << endl; }void A::printA() {cout << m_a << endl; }class C { public:int m_c;C(int c); };C::C(int c) {m_c = c;cout << "constuctor C ok~" << endl; }class B :public A { public:int m_c;B(int b);~B();void printB();C c;const int d; };B::B(int b) : A(b), c(b) , d(b)//初始化列表 這個順序無所謂 {cout << "constuctor B ok~" << endl;m_b = b; }B::~B() {cout << "destuct B ok~" << endl; }void B::printB() {cout << m_b << endl; }int main() {B b1(1);b1.printA();b1.printB();system("pause");return 0; }

類的繼承中 父類子類出現同名成員變量 ?依然繼承 只是調用的時候 調用自己的

#include <iostream>#include <windows.h>using namespace std;class A { public:int m_a;int m_b;};class B :public A { public:int m_b;int m_c; };int main() {B b1;cout << sizeof(b1) << endl;cout << &b1.m_a << endl;cout << &b1.m_b << endl;cout << &b1.A::m_b << endl;cout << &b1.m_c << endl;system("pause");return 0; }

總結

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