自己封装一个矩形类(Rect)，拥有私有属性:宽度(width)、高度(height)，

定义公有成员函数:

初始化函数:void init(int w, int h)

更改宽度的函数:set_w(int w)

更改高度的函数:set_h(int h)

输出该矩形的周长和面积函数:void show()

#include <iostream>using namespace std;class Rect
{
private:int width;int height;
public:void init(int w, int h);int set_w(int w);int set_h(int h);void show();
};void Rect::init(int w, int h)
{this->width = w;this->height = h;
}int Rect::set_w(int w)
{cout << "请输入修改的width:";cin >> w;return w;
}int Rect::set_h(int h)
{cout << "请输入修改的height:";cin >> h;return h;
}void Rect::show()
{cout << "C = " << (width+height)*2 << endl;cout << "S = " << width*height << endl;
}
int main()
{Rect r1;r1.init(0,0);cout << "初始为：" << endl;r1.show();int w = r1.set_w(w);int h = r1.set_h(h);r1.init(w,h);cout << "修改后为：" << endl;r1.show();return 0;
}