c++(类继承)示例[仅用于弱弱的博主巩固知识点用哦，不好勿喷]

测试代码:

Animals.h:

 #pragma once
 #include<string>
 class Animals
 {
 protected:
     std::string Food;
     int Weight;
     int Intake;
     double Velocity;
 public:
     Animals(const std::string &fd="none",int w=,int n=,double v=0.0);
     virtual void Speaking();
     void Swimming();
     void show(int)const;
     virtual ~Animals();
 };

 class Fish :Animals
 {
 private:
     std::string Colour;
 public:
     Fish(const std::string &cr = "none", const std::string &fd = "none", int w = , int n = , double v = 0.0);
     Fish(const std::string &cr, Animals &tp);
     void Appear()const;
     void show()const;
     void Speaking();

 };

Animals.cpp:

 #include "stdafx.h"
 #include "Animals.h"
 #include<iostream>

 Animals::Animals(const std::string  &fd, int w, int n,double v):Food(fd),Weight(w),Intake(n), Velocity(v)
 {}

 void Animals::Speaking()
 {
     std::cout << "......" << std::endl;
 }

 void Animals::Swimming()
 {
     std::cout <<"++++++"<< Velocity << "m/s" <<"++++++"<< std::endl;
 }

 void Animals::show(int p) const
 {
     std::cout << "I want eatting ";
     for (int i = ; i < p; i++)
         std::cout << Food<<"! ";
     std::cout << std::endl;
 }

 Animals::~Animals()
 {
 }

 Fish::Fish(const std::string & cr, const std::string & fd, int w, int n, double v) :Animals(fd,w,n,v)
 {
     Colour = cr;
 }

 Fish::Fish(const std::string & cr, Animals & tp):Animals(tp),Colour(cr)
 {}

 void Fish::Speaking()
 {
     std::cout << "Booo Booo!" << std::endl;
 }

 void Fish::Appear() const
 {
     std::cout << Colour << std::endl;
 }

 void Fish::show() const
 {
     std::cout << "Food: " << Food << std::endl;
     std::cout << "Weight: " << Weight << std::endl;
     std::cout << "Intake: " << Intake << std::endl;
     std::cout << "Velocity: " << Velocity <<" m/s"<< std::endl;
     std::cout << "Colour: " << Colour << std::endl;
 }

ConsoleApplication.cpp:

 #include "stdafx.h"
 #include "Animals.h"
 #include<iostream>
 using namespace std;
 int main()
 {
     Animals p0("shrimp", , , 1.0);
     Fish b0("Red and White", "Coral", , , 0.5);
     p0.show();
     p0.Speaking();
     p0.Swimming();
     cout << endl ;
     b0.show();
     cout << "Now I must speaking: ";
     b0.Speaking();
     cout << endl ;
     Fish b1("Blue", p0);
     b1.show();
     cout << "Now I must speaking: ";
     b1.Speaking();
     return ;
 }

运行结果: