C++快速入门课件源码讨论之静态属性和静态方法

shaoguanfa · 发表于 2015-1-21 16:26:57

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#include <iostream>
#include <string>
class Pet
{
public:
        Pet(std::string theName);
        ~Pet();
        static int getCount();
protected:
        std::string name;
private:
        static int count;
};
class Dog : public Pet
{
public:
        Dog (std::string theName);
};
class Cat: public Pet
{
public:
        Cat(std::string theName);
};
int Pet::count = 0;

Pet::Pet(std::string theName)
{
        name = theName;
        count++;
        std::cout << "一只宠物出生了，名字叫做：" << name << "\n";
}

Pet::~Pet()
{ 
        count--;
        std::cout << name << "挂掉了\n";
}
int Pet::getCount()
{
        return count;
}
Dog::Dog(std::string theName) :Pet(theName)
{
        std::cout << this<< std::endl;
}
Cat::Cat(std::string theName) : Pet(theName)
{

}
int main()
{
        
                Dog dog("Tom");
            Cat cat("Jerry");
                std::cout << &dog;
                std::cout << "\n已经诞生了" << Pet::getCount() << "只宠物！\n"; 
        
        
                Dog dog2("TT");
                Cat cat2("JJ");
                std::cout << "\n现在呢 ，已经诞生了" << Pet::getCount() << "只宠物！\n";
        
        std::cout << "\n现在还剩下" << Pet::getCount() << "只宠物！\n";
        return 0;
}

shaoguanfa · 发表于 2015-1-21 16:29:16

#include <iostream>
#include <string>
class BaseClass
{
public:
        BaseClass();
        ~BaseClass();
        void doSomething();
};
class SubClass :public BaseClass
{
public:
        SubClass();
        ~SubClass();
};
BaseClass::BaseClass()
{
        std::cout << "进入基类构造器\n";
        std::cout << "基类构造器\n";
}

BaseClass::~BaseClass()
{
        std::cout << "进入基类析构器\n";
        std::cout << "基类析构器\n";
}

void BaseClass::doSomething()
{
        std::cout << "我在吃东西\n";
}


SubClass::SubClass()
{
        std::cout << "进入子类构造器\n";
        std::cout << "子类构造器\n";
}

SubClass::~SubClass()
{
        std::cout << "进入子类析构器\n";
        std::cout << "子类析构器\n";
}
int main()
{
        SubClass subclass;
        subclass.doSomething();
        std::cout << "完事！\n";
        
        system("pause");
        return 0;
}

继承机制中的构造器和析构器

shaoguanfa · 发表于 2015-1-21 19:09:35

简单说一下我的理解吧
本来觉得已经理解了，可是仅仅换了一个名字就白痴了。。。。
在类继承里面是这样的

#include <iostream>
#include <string>
class animal
{
public:
        std::string mouth;
        void eat();
        void sleep();
        void drool();
};
class pig:public animal
{
public:
        void climb();
        void eat();
};
class turtle :public animal
{
public:
        void swim();
};
void animal::eat()
{
        std::cout << "I'm eattimg!" << std::endl;
}
void animal::sleep()
{
        std::cout << "I'm sleeping!" <<std:: endl;
}
void animal::drool()
{
        std::cout << "I'm drooling" << std::endl;
}
void pig::eat()
{
        std::cout << "吃了你！" << std::endl;
}
void pig :: climb()
{
        std::cout << "I'm climbing" << std::endl;
}
void turtle::swim()
{
        std::cout<<"I'm swimming"<< std::endl;
}
int main()
{
        pig a;
        turtle b;
        a.eat();//在调用的时候会调用void pig::eat()方法，而void animal::eat()会被前者覆盖
        a.mouth = "chang";
        b.mouth = "bian";
        a.climb();
        a.drool();
        a.sleep();
        b.swim();
        b.drool();
        b.sleep();
        std::cout<<a.mouth<<std::endl;
        std::cout<<b.mouth<<std::endl;
        system("pause");
}

shaoguanfa · 发表于 2015-1-21 19:20:25

#include <iostream>
#include <string>
class Pet
{
public:
        Pet(std::string theName);
        void eat();
        void sleep();
        virtual  void play();<font style=""><font size="5"><font style="background-color: black;"><font color="cyan">//<strong>需要注意的是虚方法的使用</strong></font></font></font></font>
protected:
        std::string name;
private:

};
class Cat :public Pet
{
public:
        Cat(std::string theName);
        void climb();
        void play();
private:

};
class Dog :public Pet
{
public:
        Dog(std::string theName);
        void bark();
        void play();
private:

};
Pet::Pet(std::string theName)
{
        name = theName;
}
void Pet::eat()
{
        std::cout << name << "正在吃东西！\n";
}
void Pet::sleep()
{
        std::cout << name << "正在睡大觉！\n";
}
void Pet::play()
{
        std::cout << name << "正在玩游戏！\n";
}
Cat::Cat(std::string theName) :Pet(theName)
{
}
void Cat::climb()
{
        std::cout << name << "正在爬树！\n";
}
void Cat::play()
{
        std::cout << name << "正在玩毛毛球！\n";
}
Dog::Dog(std::string theName) :Pet(theName)
{
}
void Dog::bark()
{
        std::cout << name << "汪汪汪汪！\n";
}
void Dog::play()
{
        std::cout << name << "正在追赶那只该死的猫！\n";
}
int main()
{
        Pet *cat = new Cat("加菲猫");
        Pet *dog = new Dog("欧迪");
        cat->sleep();
        cat->eat();  <strong><font color="cyan" style="background-color: black;">//这里如果是用Cat cc;  cc.eat();结果是什么呢？自己改一下就知道了<img alt="" src="http://bbs.fishc.com/static/image/smiley/lovely/20080925104601644.gif" border="0" smilieid="105"></font></strong>
        cat->play();
        dog->sleep();
        dog->eat();
        Dog dd("bb");
        dd.bark();
        dog->play();
        delete cat;
        delete dog;
        return 0;
}

shaoguanfa · 发表于 2015-1-21 19:23:03

这段代码是我自己在网上搜索的
给大家做个参考

#include <iostream>
using namespace std;
class Complex
{
        public:
           Complex() { real = 0; imag = 0; }
           Complex(double r, double i) { real = r; imag = i; }
           operator double() { return real; } //类型转换函数
        private :
           double real;
           double imag;
};

int main()
{
           Complex c1(3, 4), c2(5, -10), c3;
           double d;
           d = 2.5 + c1;//要求将一个double数据与Complex类数据相加
           cout << d << endl;
           return 0;
}

shaoguanfa · 发表于 2015-1-21 19:24:42

shaoguanfa 发表于 2015-1-21 19:23
这段代码是我自己在网上搜索的
给大家做个参考

是不是跟你想象的有点不一样？我也很疑惑呢，

operator double() { return real; } //类型转换函数
d = 2.5 + c1;//要求将一个double数据与Complex类数据相加

还没理解。。。。

shaoguanfa · 发表于 2015-1-21 19:34:07

#include <iostream>
using namespace std;
void main() 
{ 
        cout<<"第一章"<<endl; 
        cout<<" ";
        cout.setf(ios::left);//设置对齐方式为left 
        cout.width(7);//设置宽度为7，不足用空格填充 
        cout<<"1.1";
        cout<<"什么是C语言";
        cout.unsetf(ios::left); //取消对齐方式，用缺省right方式
        cout.fill('.'); //设置填充方式 
        cout.width(30); //设置宽度，只对下条输出有用 
        cout<<1<<endl; 
        cout<<" "; 
        cout.width(7); //设置宽度 
        cout.setf(ios::left); //设置对齐方式为left 
        cout.fill(' '); //设置填充，缺省为空格 
        cout<<"1.11"; 
        cout<<"C语言的历史"; 
        cout.unsetf(ios::left); //取消对齐方式 
        cout.fill('.'); 
        cout.width(30); 
        cout<<58<<endl; 
        cout.fill(' '); 
        cout<<"第二章"<<endl; 
}

这是一段控制格式输出的代码感觉还不错输出结果如下
QQ截图20150121193112.png

shaoguanfa · 发表于 2015-1-21 19:39:00

这是文件写入并读取的代码，希望对初学者有点帮助

<p> <div class="blockcode"><blockquote>#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main()
{
        string s;
        cout << "请输入要写入的内容：" << endl;
        getline(cin, s);
        fstream p("a.txt", ios::in | ios::out|ios::app );
        p << s << endl;
        cout << "读取的内容是：" << endl;
        static char line[222];
        p.seekg(ios::beg);
        while (!p.eof())
        {
                p.getline(line,222);
                cout << line<<endl ;
        }
        p.close();
        system("pause");
        return 0;
        
}

shaoguanfa · 发表于 2015-1-21 21:10:01

多继承与虚继承

#include <iostream>
#include <string>
class Person
{
public:
        Person(std::string theName);
        void introduce();
protected:
        std::string name;
};
class Teacher :virtual public Person
{
public:
        Teacher(std::string theName, std::string theClass);
        void teach();
        void introduce();
protected:
        std::string classes;
};
class Student :virtual public Person
{
public:
        Student(std::string theName, std::string theClass);
        void attendClass();
        void introduce();
protected:
        std::string classes;
};
class TeachingStudent :public Student, public Teacher
{
public:
        TeachingStudent(std::string theName, std::string classTeaching, std::string classAttending);
        void introduce();
};
Person::Person(std::string theName)
{
        name = theName;
}
void Person::introduce()
{
        std::cout << "大家好，我是" << name << "。\n";
}
Teacher::Teacher(std::string theName, std::string theClass) :Person(theName)
{
        classes = theClass;
}
void Teacher::teach()
{
        std::cout << name << "教" << classes << "。\n";
}
void Teacher::introduce()
{
        std::cout << "大家好，我是" << name << ",我教" << classes << "。\n";
}
Student::Student(std::string theName, std::string theClass) :Person(theName)
{
        classes = theClass;
}
void Student::attendClass()
{
        std::cout << name << "加入" << classes << "学习。\n";
}
void Student::introduce()
{
        std::cout << "大家好，我是" << name << "，我在" << classes << "学习。\n";
}
TeachingStudent::TeachingStudent(std::string theName,
        std::string classTeaching, std::string classAttending) :Teacher(theName, classTeaching), Student(theName, classAttending),Person(theName)
{

}
void TeachingStudent::introduce()
{
        std::cout << "大家好，我是" << name << "。我教" << Teacher::classes << ","<<"同时，我在"<<Student::classes<<"学习。\n";
}
int main()
{
        Teacher teacher("天天", "初级语言");
        Student student("小白", "初级语言");
        TeachingStudent teachingstudent("飞鱼", "初级语言", "高级语言");
        teacher.introduce();
        teacher.teach();
        student.introduce();
        student.attendClass();
        teachingstudent.introduce();
        teachingstudent.teach();
        teachingstudent.attendClass();
        return 0;
}

freeparty · 发表于 2015-1-25 09:23:52

学习下c++，

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[技术交流] C++快速入门课件源码讨论之静态属性和静态方法

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[技术交流] C++快速入门 课件源码讨论之静态属性和静态方法

马上注册，结交更多好友，享用更多功能^_^

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[技术交流] C++快速入门课件源码讨论之静态属性和静态方法