1、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){width = w;height = h;}void set_w(int w){width = w;}void set_h(int h){height = h;}void show(){cout << "width = " << width << endl;cout << "height = " << height << endl;}};int main()
{Rect rec1;rec1.init(5, 6);rec1.show();rec1.set_w(7);rec1.set_h(9);rec1.show();return 0;
}

2、思维导图