C++ day2

思维导图

封装一个矩形类

#include <iostream>
 
using namespace std;
 
class Rect
{
private:
    int height;
    int width;
 
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 << "周长为：" << (width+height)*2 << endl;
        cout << "面积为：" << width * height << endl;
 
    }
 
};
 
 
int main()
{
    Rect s1;
    s1.init(10,5);
    s1.show();
    int w,h;
    cout << "请输入更改的宽度:";
    cin >> w ;
    s1.set_w(w);
    cout << "请输入要更改的长度：";
    cin >> h;
    s1.set_h(h);
    s1.show();
    return 0;
}