13. initialization section & class member variable

- initialization section

#include <iostream>  // 명시적 호출과 초기화 색션
#include <string>
using namespace std;

class DayOfYear
{
public:
	DayOfYear(string m, int d);
	DayOfYear(string m);
	DayOfYear();
    void input();
    void output();
    string getMonth();
    int getDay();
    void setMonthDay(string m, int d);
private:
    string month;
    int day;
};

int main()
{
    DayOfYear date1, date2, date3;

    // 명시적 호출
	date1 = DayOfYear("May",5);
	date1 = DayOfYear("Feb");
	date1 = DayOfYear();
    // 출력
    date1.output(); 
	date2.output();
	date3.output();
    
    return 0;
}

//초기화 섹션
DayOfYear::DayOfYear(string m, int d):month(m), day(d)
{
}

DayOfYear::DayOfYear(string m):month(m), day(1)
{
}

DayOfYear::DayOfYear():month("Jan"), day(1)
{
}

void DayOfYear::input()
{
    cout << "Month & day: ";
    cin >> month >> day;
}

void DayOfYear::output()
{
    cout << "Month = " << month << endl;
    cout << "Day = " << day << endl;
}

string DayOfYear::getMonth()
{
    return month;
}

int DayOfYear::getDay()
{
    return day;
}

void DayOfYear::setMonthDay(string m, int d)
{
    month = m;
    day = d;
}

 

- classs member variable

#include <iostream>  // 클래스의 상속과 초기화 섹션
#include <string>
using namespace std;

class DayOfYear
{
public:
	DayOfYear(string m, int d);
	DayOfYear(string m);
	DayOfYear();
    void input();
    void output();
    string getMonth();
    int getDay();
    void setMonthDay(string m, int d);
private:
    string month;
    int day;
};

class Holiday
{
public:
	Holiday(string m, int d, bool h);
	Holiday();
	void output();
private:
	DayOfYear date;
	bool tf;

};

int main()
{
    Holiday children("May", 5, true), today("April", 11, false);

    // 출력
   children. output();
   today.output();
    
    return 0;
}

//Holiday 생성자
Holiday::Holiday(string m, int d, bool h):date(m,d), tf(h)
{
	//month = m; 오류
	//day = d;
	//tf = h;
}
Holiday::Holiday(): date(), tf(false)
{
}

void Holiday::output()
{
	date.output();
	cout << "holiday =" << tf << endl;
}
//DayofYear 생성자
DayOfYear::DayOfYear(string m, int d):month(m), day(d)
{
}

DayOfYear::DayOfYear(string m):month(m), day(1)
{
}

DayOfYear::DayOfYear():month("Jan"), day(1)
{
}

void DayOfYear::input()
{
    cout << "Month & day: ";
    cin >> month >> day;
}

void DayOfYear::output()
{
    cout << "Month = " << month << endl;
    cout << "Day = " << day << endl;
}

string DayOfYear::getMonth()
{
    return month;
}

int DayOfYear::getDay()
{
    return day;
}

void DayOfYear::setMonthDay(string m, int d)
{
    month = m;
    day = d;
}