类的继承

类与对象
Animal.h 文件

#include<iostream.h>
class Animal{
    // 定义属性
    protected:
	  int age;
	  int weight;

    //定义方法
    public:
      Animal();
      ~Animal();

      void setAge(int sage);
      int getAge();

      void setWeight(int sweight);
      int getWeight();

      void eat();
      void sleep();
}; //记住加 ; 号

Animal_Impl.cpp文件:

#include"Animal.h"  包含自定义的头文件
using namespace std;

Animal::Animal(){

}

Animal::~Animal(){}

void Animal::setAge(int sage){
    age = sage;
}

int Animal::getAge(){
	return age;
}

void Animal::setWeight(int sweight){
	weight = sweight;
}

int Animal::getWeight(){
	return weight;
}

void Animal::eat(){
	cout<<"Animal eatting......"<<endl;
}

void Animal::sleep(){
	cout<<"Animal is sleepping......"<<endl;
}

Dog.h 类的头文件

#include<iostream.h>
#include"Animal.h"   包含父类的头文件

class Dog : public Animal{   //Animal必须有实现 才可以继承

    protected:     定义自己的属性
       int color;

    public:
       Dog();
       ~Dog();

       void setColor(int c);
       int getColor();

       void speak();
};

Dog_Impl.cpp 文件

#include"Dog.h"  包含头文件
using namespace std;

Dog::Dog(){}
Dog::~Dog(){}

void Dog::setColor(int c){
  color = c;
}

int Dog::getColor(){
	return color;
}

void Dog::speak(){
   cout<<"dog speak wang wang wang"<<endl;
}

TestMain.cpp 测试文件

#include"Dog.h"
using namespace std;

int main(){

    Dog dog;
    dog.setAge(3); // 继承父类中的方法
    cout<<"the dog's age is: "<<dog.getAge()<<endl;
    dog.setWeight(2);// 继承父类中的方法
    cout<<"the dog's Weight is: "<<dog.getWeight()<<endl;

    dog.setColor(1);//dog类中的方法
    cout<<"the dog's color is: "<<dog.getColor()<<endl;
    dog.speak();

//    dog.age = 1;
//    cout<<"the dog's age is: "<<dog.age<<endl;
	return 0;
}

/**
 * the dog's age is: 3
   the dog's Weight is: 2
   the dog's color is: 1
   dog speak wang wang wang
 *
 * */