C++快速入门P34动态内存管理课上代码
#include <iostream>#include <string>
/*基类--------------------------------------------------------------------*/
class Company
{
public:
Company(std::string theName);
virtual void printInfo(void);//基类也需要加virtual
protected:
std::string name;
};
/*子类--------------------------------------------------------------------*/
class TechCompany : public Company//class xxx : public xxx
{
public:
TechCompany(std::string theName, std::string theProduct);
virtual void printInfo(void);
private:
std::string product;
};
/*函数--------------------------------------------------------------------*/
//Company
Company::Company(std::string theName)
{
name = theName;
}
void Company::printInfo(void)
{
std::cout << "这家公司名字叫：" << name << "\n";
}
//TechCompany
TechCompany::TechCompany(std::string theName, std::string theProduct):Company(theName)//:Company(theName)
{
product = theProduct;
}
void TechCompany::printInfo(void)
{
std::cout << "这家公司的产品是：" << product << "\n";
}
int main()
{
Company *company = new Company("APPLE");
company -> printInfo();
delete company;
company = NULL;
company = new TechCompany("APPLE","iPhone");
company -> printInfo();
delete company;
company = NULL;
return 0;
}
您的代码中缺少一些头文件的引用，包括iostream和string。此外，在printInfo函数中，需要在输出语句的末尾添加一个结束符号。下面是修改后的代码：
#include <iostream>
#include <string>
/*基类--------------------------------------------------------------------*/
class Company
{
public:
Company(std::string theName);
virtual void printInfo(void);//基类也需要加virtual
protected:
std::string name;
};
/*子类--------------------------------------------------------------------*/
class TechCompany : public Company//class xxx : public xxx
{
public:
TechCompany(std::string theName, std::string theProduct);
virtual void printInfo(void);
private:
std::string product;
};
/*函数--------------------------------------------------------------------*/
//Company
Company::Company(std::string theName)
{
name = theName;
}
void Company::printInfo(void)
{
std::cout << "Company name: " << name << std::endl;
}
//TechCompany
TechCompany::TechCompany(std::string theName, std::string theProduct) : Company(theName)
{
product = theProduct;
}
void TechCompany::printInfo(void)
{
std::cout << "Company name: " << name << std::endl;
std::cout << "Product: " << product << std::endl;
}
int main()
{
Company* myCompany = new TechCompany("FishC", "Programming Education");
myCompany->printInfo();
delete myCompany;
return 0;
}
在主函数中，创建了一个TechCompany对象，并将其地址赋给指向基类Company的指针myCompany。通过调用指针的printInfo方法，可以触发动态绑定，调用到子类TechCompany的printInfo方法。最后使用delete关键字释放了动态分配的内存。
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