C++ 상속 예제

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cstring>


using namespace std;

class Person
{
private:
	int age;
	char name[30];

public:
	Person(int myage, const char* myname) : age(myage)
	{
		strcpy(name, myname);
	}
	void whatsyourname() const
	{
		cout << "my name is " << name << endl;
	}
	void howoldareyou() const
	{
		cout << "I'm " << age << endl;
	}
};

class univstudent : public Person
{
private:
	char major[50];

public:
	univstudent(const char* myname, int myage, const char* mymajor) : Person(myage, myname)
	{
		strcpy(major, mymajor);
	}
	void whoareyou() const
	{
		whatsyourname();
		howoldareyou();
		cout << "My major is " << major << endl << endl;
	}
};

int main(void)
{
	univstudent s1("hi", 30, "man");
	s1.whoareyou();

	univstudent s2("hi", 30, "woman");
	s2.whoareyou();

	return 0;
}

 

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cstring>
using namespace std;

class Person
{
private:
	char* name;
public:
	Person(const char* myname)
	{
		name = new char[strlen(myname) + 1];
		strcpy(name, myname);
	}
	~Person()
	{
		cout << "delete name" << endl;
		delete []name;
	}
	void whatsyourname() const
	{
		cout << "my name is " << name << endl;
	}
};

class univstudent : public Person
{
private:
	char* major;

public:
	univstudent(const char* myname, const char* mymajor) : Person(myname)
	{
		major = new char[strlen(mymajor)+1];
		strcpy(major, mymajor);
	}
	~univstudent()
	{
		//cout << "delete major" << endl;
		delete []major;
	}
	void whoareyou() const
	{
		whatsyourname();
		cout << "My major is " << major << endl << endl;
	}
};

int main(void)
{
	univstudent s1("hi", "man");
	s1.whoareyou();

	univstudent s2("hi", "woman");
	s2.whoareyou();

	return 0;
}

 

 

protected 상속

#include <iostream>
using namespace std;

class Base
{
private:
	int num1;
protected:
	int num2;
public:
	int num3;

	Base() : num1(1), num2(2), num3(3)
	{

	}
};

class Derived : protected Base 
{
// 상속 받은 클래스에서는 접근 가능
//public:
//	void getnum()
//	{
//		num2 = 2;
//	}
};

int main(void)
{
	Derived drv;
	cout << drv.num3 << endl; // 컴파일 에러
	return 0;
}

 

참고 : [윤성우 열혈 C++ 프로그래밍]