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)  //初始化函数
    {
        width = w;
        height = h;
    }

    void set_w(int w)     //更改宽度
    {
        width = w;
    }

    void set_h(int h)    //更改高度
    {
        height = h;
    }

    void show()        //计算周长和面积，并输出
    {
        int area = width*height;
        int perimeter = 2*(width+height);
        cout << "Width is: " << width << endl;
        cout << "Height is: " << height << endl;
        cout << "Area is: " << area << endl;
        cout << "Perimeter is: " << perimeter << endl;
    }
};

int main()
{
    Rect rect;
    int m,n;
     cout << "please input width and hight :";
    cin >> m >> n;
    cout << "未更改前数据如下" << endl;
    rect.init(m,n);
    rect.show();
    cout << endl;
    cout << "please input change width and hight :";
    cin >> m >> n;
    cout << "更改后数据如下" << endl;
    rect.set_w(m);
    rect.set_h(n);
    rect.show();

    return 0;
}

思维导图