C++ 언어 연습문제19

[문제]

아래의 코드를 보고 모든 클래스에 생성자를 정의하라.

#include<iostream>

using namespace std;

class Point
{
private:
	int xpos;
	int ypos;
public:
	void Init(int x, int y)
	{
		xpos = x;
		ypos = y;
	}
	void ShowPointInfo()	const
	{
		cout << "[" << xpos << ", " << ypos << "]" << endl;
	}
};

class Circle
{
private:
	Point center;
	int rad;
public:
	void Init(int x, int y, int r)
	{
		center.Init(x, y);
		rad = r;
	}
	void ShowCircleInfo()	const
	{
		cout << "radius: " << rad << endl;
		center.ShowPointInfo();
	}
};

class Ring
{
private:
	Circle InCir, OutCir;
public:
	void Init(int inxpos, int inypos, int inrad, int outxpos, int outypos, int outrad)
	{
		InCir.Init(inxpos, inypos, inrad);
		OutCir.Init(outxpos, outypos, outrad);
	}
	void ShowRingInfo()		const
	{
		cout << "Inner Circle Info.." << endl;
		InCir.ShowCircleInfo();
		cout << "Outter Circle Info.." << endl;
		OutCir.ShowCircleInfo();
	}
};
int main()
{
	Ring ring;
	ring.Init(1, 1, 4, 2, 2, 9);
	ring.ShowRingInfo();

	return 0;
}

 

[실행 결과]

Inner Circle Info...
radius: 4
[1, 1]
Outter Circle Info...
radius: 9
[2, 2]

 

[코드]

#include<iostream>

using namespace std;

class Point
{
private:
	int xpos;
	int ypos;
public:
	Point(int x, int y) :xpos(x), ypos(y)
	{	}
	void ShowPointInfo()	const
	{
		cout << "[" << xpos << ", " << ypos << "]" << endl;
	}
};

class Circle
{
private:
	Point center;
	int rad;
public:
	Circle(int x, int y, int r) :center(x, y)
	{
		rad = r;
	}
	void ShowCircleInfo()	const
	{
		cout << "radius: " << rad << endl;
		center.ShowPointInfo();
	}
};

class Ring
{
private:
	Circle InCir, OutCir;
public:
	Ring(int inxpos, int inypos, int inrad, int outxpos, int outypos, int outrad)
		:InCir(inxpos, inypos, inrad), OutCir(outxpos, outypos, outrad)
	{	}
	void ShowRingInfo()		const
	{
		cout << "Inner Circle Info.." << endl;
		InCir.ShowCircleInfo();
		cout << "Outter Circle Info.." << endl;
		OutCir.ShowCircleInfo();
	}
};
int main()
{
	Ring ring(1, 1, 4, 2, 2, 9);
	ring.ShowRingInfo();

	return 0;
}

 

<참고>

윤성우의 열혈 C++ 프로그래밍