作业1

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#include<iostream>
using namespace std;

class Rectangle {
 private:
	 float width, height;
public:
	Rectangle();//无参数构造函数
	Rectangle(float width, float height);//声明构造函数
	void Setwidth(float width) {//设置新的宽度
		this ->width = width;
	}
	void Setheight(float height) {//设置新的高度
		this->height = height;
	}
	float getArea(){
		return height * width;
	}
	float getPerimeter() {
		return (height + width) * 2;
	}
};
Rectangle::Rectangle() {//无参数构造函数使用
	this->width = 1.0;
	this->height = 1.0;
}
Rectangle::Rectangle(float width, float height) {//有参数构造函数使用
	this->width = width;
	this->height = height;
}
int main(void) {
	Rectangle rec_1;//
	cout << "无参构造函数的面积为:" << rec_1.getArea() <<"  长度为:" <<rec_1.getPerimeter()<< endl;
	Rectangle rec_2(4,5);
	cout << "有参构造函数的面积为:" << rec_2.getArea() << "  长度为:" << rec_2.getPerimeter() << endl;
	rec_2.Setheight(8);//长度修改为8
	cout << "修改后的有参构造函数的面积为:" << rec_2.getArea() << "  长度为:" << rec_2.getPerimeter() << endl;
	system("pause");
	return 0;
}