C++学习杂记

定义的头文件：

class Girl 定义成虚拟基类，这样将禁止生成基类Girl的对象，同时把构造函数：不带参数的构造函数Girl( )   、 带参

 

数的构造函数  Girl( string name , int height , int age, int weight ) 放在了protected作用域，进一步强调禁止在Girl类外创建基于

 

 

基类的对象，当然显式的把复制构造函数放在private域，也是有利无弊的。

class Beauty_girl  :  public Girl { }; 定义了一个Beauty_girl，从基类Girl公有派生而来，添加了四个新增加成员，

 

bool her_mettle ;  //气质

bool her_culture ;  //修养

bool her_kind_heart ; // 善良

bool her_virgin ;   

 

此时基类Girl 的 public成员将隐式作为派生类Beauty_girl 的Public成员（注意，用的是隐式，可以理解为从基类到派生类对应作用域的映

 

射），此时派生类对象可在类外部直接调用公有继承的方法或数据成员。

 

 

同样基类Girl的protected成员将隐式作为派生类Beauty_girl的protected成员（过分强调一个问题，可能略显多余，但我觉得对比犯下隐

 

晦的难以发现的bug，这样还是有必要的 【隐式可以理解为从基类到派生类对应作用域的映射，至少我认为不会是直接的copy，那样是很影

 

响C++类封装的效率的】） 。

 

 

当然基类Girl的private成员将隐式作为派生类Beauty_girl的private成员，这时在类外访问private成员（数据或者方法）必须通过派生类

 

对应的接口（及public方法）来间接调用。

 

#ifndef GIRL_H #define GIRL_H #include<string> #include<iostream> using std::string ; using std::cout; using std::endl; class Girl //virtual base class { private: string her_name ; int her_height ; int her_age ; int her_weight ; Girl( const Girl& ); public: virtual ~Girl( )=0 ; void Get_name( )const{ cout<<"Name : "<<her_name<<endl ; } void Get_height( )const{ cout<<"Height : "<<her_height<<endl ; } void Get_age( )const{ cout<<"Age : "<<her_age<<endl ; } void Get_weight( )const{ cout<<"Weight : "<<her_weight<<endl ; } protected : Girl( ) : her_name("Love_Ling"), her_height( 165 ), her_age( 18 ), her_weight(85 ) { cout<<"Default Constructor Called "<<endl; } Girl( string name , int height , int age, int weight ) : her_name(name),her_height(height), her_age(age), her_weight(weight) { cout<<"Explicit Constructor Called "<<endl; } void Get_information( )const; } ; class Beauty_girl : public Girl //Drived class { private: bool her_mettle ; //气质 bool her_culture ; //修养 bool her_kind_heart ; // 善良 bool her_virgin ; Beauty_girl( const Beauty_girl& ); public: Beauty_girl( ) : Girl( ), her_mettle( true ), her_culture( true ), her_kind_heart( true ), her_virgin(true){ } Beauty_girl( string name , int height , int age, int weight, bool mettle, bool culture, bool kind_heart , bool virgin ) : Girl( name, height, age,weight ), her_mettle(mettle), her_culture(culture), her_kind_heart(kind_heart),her_virgin(virgin){ } void Set_mettle( bool yes_or_no ) { her_mettle=yes_or_no; } void Set_culture( bool yes_or_no ) { her_culture=yes_or_no; } void Set_kind_heart( bool yes_or_no ) { her_kind_heart=yes_or_no; } void Set_virgin( bool yes_or_no ) { her_virgin=yes_or_no ; } void Get_mettle( )const; void Get_culture( )const ; void Get_kind( )const; void If_virgin( )const; void Get_infor( )const; void Syn_judge( ); protected: void Judge( )const; }; class Sex_girl : private Beauty_girl { private: int her_bust ; int her_waist ; int her_hip ; Sex_girl(const Sex_girl& ); public: Sex_girl( ) : Beauty_girl( ), her_bust( 33 ), her_waist( 22 ), her_hip( 33 ){ } Sex_girl( string name , int height , int age, int weight, bool mettle, bool culture, bool kind_heart , bool virgin, int bust, int waist, int hip ) : Beauty_girl( name, height, age,weight, mettle, culture, kind_heart, virgin ) , her_bust(bust), her_waist(waist), her_hip(hip ){ } void Set_bust( int bust ) { her_bust=bust; } void Set_waist( int waist ) { her_waist=waist; } void Set_hip( int hip ) { her_hip=hip; } void Get_sex_infor( )const; void Set_sex_chara( bool mettle, bool culture, bool kind_heart, bool virgin ,int bust, int waist, int hip ); void Syns_judge( )const ; }; #endif 

 

class Sex_girl 通过私有继承Beauty_girl派生而来，此时基类Beauty_girl的public/protected成员都将作为派生类Sex_girl的

 

私有(private)成员，此时在类外，通过派生类对象直接调用基类public成员是不被允许的。派生类对象可在类外通过派生类public成员方法

 

来间接访问基类的public/protected成员。

 

 

#include"stdafx.h" #include"girl.h" using std::endl; //Girl member function// Girl::~Girl( ) { cout<<"Constructor of Girl called ! "<<endl; } void Girl::Get_information( )const { Get_name( ); Get_height( ); Get_age( ); Get_weight( ); } //Beauty_girl member function// void Beauty_girl::Get_mettle( )const { if ( her_mettle==true ) cout<<"Yes, you are a mettler "<<endl; else cout<<"Pity , you are a rude giel "<<endl; } void Beauty_girl::Get_culture( )const { if ( her_culture==true ) cout<<"Yes , you are a culture girl "<<endl; else cout<<"oh no , you are a dirty girl "<<endl; } void Beauty_girl::Get_kind( )const { if ( her_kind_heart==true ) cout<<"yes , you are kind heart a girl "<<endl; else cout<<"shit , you are atrocity a girl "<<endl; } void Beauty_girl::If_virgin( )const { if ( her_virgin==true ) cout<<"Congratulations , You Still a Virgin "<<endl; else cout<<"God , you yet not a virgin "<<endl; } void Beauty_girl::Get_infor( )const { Girl::Get_information( ); Get_mettle( ); Get_culture( ); Get_kind( ); If_virgin( ); } void Beauty_girl::Judge( )const { if ( her_kind_heart==true ) { if ( her_virgin ==true ) { if ( her_mettle==true ) { cout<<"God Bless , You are a pure girl ! "<<endl; } else { cout<<"Jeez , you'd better train you mettle ! "<<endl; } } else { cout<<"Girl must feel good about herself ! "<<endl; } } else { cout<<"kind heart is most precious in the world ! "<<endl; } } void Beauty_girl::Syn_judge( ) { cout<<"--------------Synthesize Judge--------------"<<endl; Judge( ); } //Sex_girl member function// void Sex_girl::Get_sex_infor( )const { Beauty_girl::Get_infor( ); cout<<"Bust : "<<her_bust<<endl; cout<<"Waist : "<<her_waist<<endl; cout<<"Hip : "<<her_hip<<endl; } void Sex_girl:: Set_sex_chara( bool mettle, bool culture, bool kind_heart, bool virgin, int bust, int waist, int hip ) { Beauty_girl:: Set_mettle( mettle ); Beauty_girl::Set_culture( culture ); Beauty_girl::Set_kind_heart( kind_heart ); Beauty_girl::Set_virgin( virgin ); Set_bust( bust ); Set_waist( waist ); Set_hip( hip ); } void Sex_girl::Syns_judge( )const { Beauty_girl::Judge( ); if ( (her_bust/her_waist)>= 1.2 && (her_bust/her_waist)<=1.5 ) { if ( (her_hip/her_waist)>=1.2 && (her_hip/her_waist)<=1.5 ) { if ( (her_bust/her_hip)>=0.9 && (her_bust/her_hip)<=1.0 ) { cout<<"you body-stature is perfect ! "<<endl; } else { cout<<"you body-stature is Sex ! "<<endl; } } else { cout<<"you must keep you body-stature ! "<<endl; } } else { cout<<"SHIT , you must reduce you weight ! "<<endl; } } 

###上面是类的实现###

 

 

###下面是main()函数###

 

// 公有继承【1】.cpp: 主项目文件。 #include "stdafx.h" #include"girl.h" #include<iostream> /* string name , int height , int age, int weight, bool mettle, bool culture, bool kind_heart , bool virgin */ int main(array<System::String ^> ^args) { Sex_girl kate ; kate.Get_sex_infor( ); kate.Syns_judge( ); /* bool mettle, bool culture, bool kind_heart, bool virgin int bust, int waist, int hip */ cout<<endl; Sex_girl My_Gf; My_Gf.Set_sex_chara( true, true, true, true , 28 , 20 , 25 ); My_Gf.Get_sex_infor( ); My_Gf.Syns_judge( ); system("pause"); return 0; }  

 

 

附注：语言难以阐释的，代码总是通用的。

 

##运行结果：