十三周任务二

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/* (程序头部注释开始)* 程序的版权和版本声明部分* Copyright (c) 2011, 烟台大学计算机学院学生 * All rights reserved.* 文件名称:由坐标点类派生出直线类。* 作    者:         张艳明                   * 完成日期:     2012    年 05      月  16 日* 版 本 号:       V1.0   * 对任务及求解方法的描述部分* 输入描述: * 问题描述: * 程序输出: * 程序头部的注释结束*/任务2.1[cpp] view plaincopy#include "iostream"  #include<string>  using namespace std;  class Animal  {  public:      virtual void cry() {cout<<"不知哪种动物,让我如何学叫?"<<endl;}  };  class Mouse :public Animal  {  public:      void cry() {cout<<"我叫Jerry,是一只老鼠,我的叫声是:吱吱吱!"<<endl;}      Mouse(string Mouse_name);  private:      string Mouse_name;  };  class Cat :public Animal  {  public:      void cry() {cout<<"我叫Tom,是一只猫,我的叫声是:喵喵喵!"<<endl;}      Cat(string Cat_name);  private:      string Cat_name;  };  class Dog :public Animal  {  public:      void cry() {cout<<"我叫Droopy,是一条狗,我的叫声是:汪汪汪!"<<endl;}      Dog(string Dog_name);  private:      string Dog_name;  };  class Giraffe :public Animal  {  public:      void cry() {cout<<"我叫Gill,是长颈鹿,脖子太长,发不出声音来!"<<endl;}      Giraffe(string Giraffe_name);  private:      string Giraffe_name;  };    Mouse::Mouse(string Mouse_name)  {      this->Mouse_name=Mouse_name;  }  Cat::Cat(string Cat_name)  {      (*this).Cat_name=Cat_name;  }  Dog::Dog(string Dog_name)  {      this->Dog_name=Dog_name;  }  Giraffe::Giraffe(string Giraffe_name)  {      this->Giraffe_name=Giraffe_name;  }  int main( )  {      Animal *p;       p = new Animal(); p->cry(); //输出: 不知哪种动物,让我如何学叫?(问题出自此处)      Mouse m("Jerry"); p=&m; p->cry(); //输出: 我叫Jerry,是一只老鼠,我的叫声是:吱吱吱!      Cat c("Tom");  p=&c; p->cry(); //输出: 我叫Tom,是一只猫,我的叫声是:喵喵喵!      Dog d("Droopy");  p=&d; p->cry(); //输出: 我叫Droopy,是一条狗,我的叫声是:汪汪汪!      Giraffe g("Gill");  p=&g; p->cry(); //输出: 我叫Gill,是长颈鹿,脖子太长,发不出声音来!      //delete p;      system("pause");      return 0;  }   任务2.2[cpp] view plaincopy#include "iostream"  #include<string>  using namespace std;  class Animal  {  public:      virtual void cry() = 0;  };  class Mouse :public Animal  {  public:      void cry() {cout<<"我叫Jerry,是一只老鼠,我的叫声是:吱吱吱!"<<endl;}      Mouse(string Mouse_name);  private:      string Mouse_name;  };  class Cat :public Animal  {  public:      void cry() {cout<<"我叫Tom,是一只猫,我的叫声是:喵喵喵!"<<endl;}      Cat(string Cat_name);  private:      string Cat_name;  };  class Dog :public Animal  {  public:      void cry() {cout<<"我叫Droopy,是一条狗,我的叫声是:汪汪汪!"<<endl;}      Dog(string Dog_name);  private:      string Dog_name;  };  class Giraffe :public Animal  {  public:      void cry() {cout<<"我叫Gill,是长颈鹿,脖子太长,发不出声音来!"<<endl;}      Giraffe(string Giraffe_name);  private:      string Giraffe_name;  };    Mouse::Mouse(string Mouse_name)  {      this->Mouse_name=Mouse_name;  }  Cat::Cat(string Cat_name)  {      (*this).Cat_name=Cat_name;  }  Dog::Dog(string Dog_name)  {      this->Dog_name=Dog_name;  }  Giraffe::Giraffe(string Giraffe_name)  {      this->Giraffe_name=Giraffe_name;  }  int main( )  {      Animal *p;       //p = new Animal(); p->cry(); //输出: 不知哪种动物,让我如何学叫?(问题出自此处)      Mouse m("Jerry"); p=&m; p->cry(); //输出: 我叫Jerry,是一只老鼠,我的叫声是:吱吱吱!      Cat c("Tom");  p=&c; p->cry(); //输出: 我叫Tom,是一只猫,我的叫声是:喵喵喵!      Dog d("Droopy");  p=&d; p->cry(); //输出: 我叫Droopy,是一条狗,我的叫声是:汪汪汪!      Giraffe g("Gill");  p=&g; p->cry(); //输出: 我叫Gill,是长颈鹿,脖子太长,发不出声音来!      //delete p;      system("pause");      return 0;  }   任务2.3:[cpp] view plaincopy#include "iostream"  #include<string>  using namespace std;  class Animal  {  public:      virtual void cry() = 0;      Animal(string Animal_name);  private:      string Animal_name;  };  class Mouse :public Animal  {  public:      void cry() {cout<<"我叫Jerry,是一只老鼠,我的叫声是:吱吱吱!"<<endl;}      Mouse(string Mouse_name);  };  class Cat :public Animal  {  public:      void cry() {cout<<"我叫Tom,是一只猫,我的叫声是:喵喵喵!"<<endl;}      Cat(string Cat_name);  };  class Dog :public Animal  {  public:      void cry() {cout<<"我叫Droopy,是一条狗,我的叫声是:汪汪汪!"<<endl;}      Dog(string Dog_name);  };  class Giraffe :public Animal  {  public:      void cry() {cout<<"我叫Gill,是长颈鹿,脖子太长,发不出声音来!"<<endl;}      Giraffe(string Giraffe_name);  };  Animal::Animal(string Animal_name)  {      this->Animal_name=Animal_name;  }  Mouse::Mouse(string Mouse_name):Animal(Mouse_name){}  Cat::Cat(string Cat_name):Animal(Cat_name){}  Dog::Dog(string Dog_name):Animal(Dog_name){}  Giraffe::Giraffe(string Giraffe_name):Animal(Giraffe_name){}  int main( )  {      Animal *p;       //p = new Animal(); p->cry(); //输出: 不知哪种动物,让我如何学叫?(问题出自此处)      Mouse m("Jerry"); p=&m; p->cry(); //输出: 我叫Jerry,是一只老鼠,我的叫声是:吱吱吱!      Cat c("Tom");  p=&c; p->cry(); //输出: 我叫Tom,是一只猫,我的叫声是:喵喵喵!      Dog d("Droopy");  p=&d; p->cry(); //输出: 我叫Droopy,是一条狗,我的叫声是:汪汪汪!      Giraffe g("Gill");  p=&g; p->cry(); //输出: 我叫Gill,是长颈鹿,脖子太长,发不出声音来!      //delete p;      system("pause");      return 0;  }  


运行结果对比:

1.1

结果二:


结果三:


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