C++:day2

思维导图

2.自定义类

#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 << "矩形的面积为：" << width * height << endl;
        cout << "矩形的周长为:" << (width + height) * 2 << endl;
    }
};

int main(int argc, char const *argv[])
{
    /* code */
    class Rect r1;
    r1.init(10, 15);
    r1.show();
    r1.set_w(500);
    r1.set_h(200);
    r1.show();
    return 0;
}