虚方法、new和delete

最新推荐文章于 2023-12-27 21:27:43 发布

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本文通过一个C++程序示例介绍了面向对象编程的基本概念，包括类的定义、继承和多态性的实现。示例中创建了一个抽象的Company基类，并派生出了具体的TechCompany子类，展示了如何使用多态特性进行编程。

#include <iostream>
#include <string>
using namespace std;
class Company
{
public:
    Company(string);
    virtual ~Company();
    virtual void work(void);
protected:
    string name;
};
class TechCompany : public Company
{
public:
    TechCompany(string, string);
    ~TechCompany();
    void work(void);
private:
    string product;
};

Company::Company(string name)
{
    this -> name = name;
    cout << name << "公司诞生了！" << endl;
}
Company::~Company()
{
    cout << name << "公司倒闭了！" << endl;
}
TechCompany::TechCompany(string name, string product) : Company(name)
{
    this -> product = product;
    cout << name << "科技公司诞生了！" << endl;
}
TechCompany::~TechCompany()
{
    cout << name << "科技公司倒闭了！" << endl;
}
void TechCompany::work(void)
{
    cout << name << "公司开始工作了，生产了" << product << "产品。" << endl;
}
void Company::work(void)
{
    cout << name << "公司开始工作了！" << endl;
}

int main()
{
    Company *company;
    company = new Company("Microsoft");
    company -> work();
    delete company;

    company = new TechCompany("Apple", "Phone");
    company -> work();
    delete company;
    return 0;
}