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()
    {
        cout << "please enter width: " <<  endl;
        cin >> width;
    }
    void set_h()
    {
        cout << "please enter height: " << endl;
        cin >> height;
    }

    void show()
    {
        cout << "perimeter = " << (height+width)*2 << endl;
        cout << "acreage = " << (height*width) << endl;
    }
};

int main()
{
    class Rect r;
    r.init(1,1);
    r.set_h();
    r.set_w();
    r.show();
    return 0;
}

2、思维导图

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