面向对象程序设计-实验八

6-1 派生类的定义和使用

代码清单：

…………………………..

………………………….

#include <iostream>

#include <string>

using namespace std;

/* 请在这里填写答案 */

class Animal

{

public:

    void speak()

    {

        cout << "animal language!" << endl;

    }

};

class Cat :public Animal

{

private:

    string m_strName;

public:

    Cat(string str)

    {

        m_strName = str;

    }

    void print_name()

    {

        cout << "cat name: " << m_strName << endl;

    }

};

int main()

{

    Cat cat("Persian"); //定义派生类对象

    cat.print_name();    //派生类对象使用本类成员函数

    cat.speak();    //派生类对象使用基类成员函数

    return 0;

}

运行结果截图

题目2

（给出题目描述）

6-2 学生派生类

代码清单：

…………………………..

………………………….

#include <iostream>

#include<string>

using namespace std;

class Student

{

public:

    Student(int n, string nam, char s)

    {

        num = n;

        name = nam;

        sex = s;

    }

    ~Student() { }

protected:

    int num;

    string name;

    char sex;

};

/* 请在这里添加派生类定义 */

class Student1 :public Student

{

public:

    int age;

    string address;

    Student1(int num, string name, char sex, int age, string address) :Student(num, name, sex)

    {

        this->age = age;

        this->address = address;

    }

    void show()

    {

        cout << "num: " << num << endl;

        cout << "name: " << name << endl;

        cout << "sex: " << sex << endl;

        cout << "age: " << this->age << endl;

        cout << "address: " << this->address << endl;

        cout << endl;

    }

};

int main()

{

    Student1 stud1(10010, "Wang-li", 'f', 19, "115 Beijing Road,Shanghai");

    Student1 stud2(10011, "Zhang-fun", 'm', 21, "213 Shanghai Road,Beijing");

    stud1.show();

    stud2.show();

    return 0;

}

运行结果截图

题目3

6-3 狗的继承

代码清单：

/* 请在这里填写答案 */

#include<iostream>

#include<string>

using namespace std;

class Animal

{

public:

    int m_age;

    Animal(int age)

    {

        m_age = age;

    }

    int getAge()

    {

        return m_age;

    }

};

class Dog :public Animal

{

public:

    string m_clack;

    Dog(int Age, string clack) :Animal(Age)

    {

        m_clack = clack;

    }

    void showInfor()

    {

        cout << "age:" << m_age << endl;

        cout << "color:" << m_clack << endl;

    }

};

int main() {

    Animal ani(5);

    cout << "age of ani:" << ani.getAge() << endl;

    Dog dog(5, "black");

    cout << "infor of dog:" << endl;

    dog.showInfor();

}

运行结果截图

题目4

7-1 定义基类Point和派生类Circle，求圆的周长.

代码清单：

#include <iostream>

#include<iomanip>

using namespace std;

//请编写你的代码

class Point

{

private:

    float m_x;

    float m_y;

public:

    Point(float x, float y)

    {

        m_x = x;

        m_y = y;

        cout<<"Point constructor called"<<endl;

    }

    ~Point()

    {

cout<<"Point destructor called"<<endl;

    }

};

class Circle :public Point

{

private:

    float m_r;

public:

    Circle(float x, float y, float r) :Point(x, y)

    {

        m_r = r;

        cout<<"Circle constructor called"<<endl;

    }

~Circle()

{

cout<<"Circle destructor called"<<endl;

}

    float getCircumference()

    {

        return 2 * 3.14 * m_r;

    }

};

int main()

{

    float x, y, r;

    cin >> x >> y >> r;

    Circle c(x, y, r);

    cout << fixed << setprecision(2) << c.getCircumference() << endl;

    return 0;

}

运行结果截图