#include <iostream >
using namespace std;

class CRectangle				//定義矩形類Rectangle
{
public:
	CRectangle();
	void SetLength(int length);
	int GetLength() const;		// const 指示該函數內限制對成員變量的修改。
	void SetWidth(int width); 
	int GetWidth() const ;
private:
	int itsLength;
	int itsWidth;
};

CRectangle::CRectangle()
{
	itsWidth = 5;
	itsLength = 10;
}

void CRectangle::SetLength(int length)
{
	this->itsLength = length;	//顯式地使用this指針來引用成員變量
}

int CRectangle::GetLength() const 
{
	return this->itsLength;			//顯式地使用this指針來引用成員變量
}

void CRectangle::SetWidth(int width) 
{
	itsWidth = width;				//this指針被隱式地使用
} 

int CRectangle::GetWidth() const 
{
	return itsWidth;				//this指針被隱式地使用
}
//-------------------------------------------------------//
int main()
{
	CRectangle	theRect;
	cout << "矩形theRect的長是 " << theRect.GetLength() << endl;
	cout << "矩形theRect的寬是 " << theRect.GetWidth() << endl;
	//調用成員函數，重新設定矩形theRect的長和寬
	theRect.SetLength(20); 
	theRect.SetWidth(10);
	cout << "矩形theRect的長是 " << theRect.GetLength() << endl;
	cout << "矩形theRect的寬是 " << theRect.GetWidth() << endl;

	return 0;
}