思维导图

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 wide;int hight;int area;public:void init(int w, int h){    //数据初始化函数wide = w;hight = h;area = wide * hight;}void set_w(int w){    //更改宽度的函数wide = w;}void set_h(int h){hight = h;}void show_area(){cout << "area is :" << wide * hight << endl;}};int main()
{int w,h;Rect r1;cout << "请依次输入长和宽 " << endl;cin >> w;cin >> h;r1.init(w,h);cout << "长方形的面积为：" << endl;r1.show_area();return 0;
}