题解 | #求长方体表面积#

#include<bits/stdc++.h>
using namespace std;
class rectangle {
  private:
    int length, width;
  public:
    rectangle(int x, int y) {
        length = x;
        width = y;
    }
    void set(int x, int y) {
        length = x;
        width = y;
    }
    int getlength() {
        return length;
    }
    int getwidth() {
        return width;
    }
    // write your code here...
    //多态关键字virtual,父类声明,也可以实现（面积）
    virtual int getval(){
        return this->length*this->width;
    }

};
class cuboid: public rectangle {
  private:
    int height;
  public:
    cuboid(int x, int y, int z): rectangle(x, y) {
        height = z;
    }
    // write your code here...
    //子类重写，实现体积
    virtual int getval(){
        return this->rectangle::getval()*this->height;
    }

};
int main() {
    int x, y, z;
    cin >> x >> y >> z;
    cuboid a(x, y, z);
    rectangle b(x, y);

    rectangle* p = &b;
    cout << p->getval() << '\n';

    p = &a;
    cout << p->getval();
    return 0;
}