c++继承

继承分好多种，先记录点：

一、简单的

公有继承：

class Base{private:int a_number;public://Base(){}Base(int i) : a_number(i) { }int get_number() { return a_number;}void print(){ cout << "a is: "<<a_number << endl;}};class Derived : public Base{private:int d_number;public:// constructor, initializer used to initialize the base part of a Derived object.Derived(int i, int j) : Base(i), d_number(j) { };// a new member function that overrides the print( ) function in Basevoid print(){cout << "b is: " << get_number() << " ";// access number through get_number( )cout << d_number<< endl;}};int main(){Base a(2);a.print();  Derived b(3, 4);// print( ) in Baseb.print();                // print( ) in Derivedcout << "base part of b is: ";b.Base::print();                // print( ) in Basereturn 0;}

2.virtual函数的应用

class A{private:int a;public:A(int i) : a(i) { }virtual void print()       {cout << a << endl;}int get_a() {//cout << "h" << endl;return a;}};class B{private:int b;public:B(int j) : b(j) { }void print()     { cout << b << endl; }int get_b() { return b;}};class C : public A, public B{int c;public:C(int i, int j, int k) : A(i), B(j), c(k) { }void print()    {cout << "f" << endl;A::print(); B::print();}// use print( ) with scope resolutionvoid get_ab() { cout << get_a() << " " << get_b() << endl;}// use get_a( ) and get_b( ) without scope resolution};int main(){C x(5, 8, 10);A* ap = &x; cout << "调用C:"<<endl;// use C::print( );ap->print(); B* bp = &x; cout << "调用B:"<<endl;   // use B::print( );bp->print();cout << "////"<<endl;x.A::print();                // use A::print( );x.get_ab();                  //use C:return 0;}