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;
    }
    int area() {
        return length * width;
    }
};
class cuboid: public rectangle {
  private:
    int height;
  public:
    // write your code here...
    //子类的构造函数继承与父类的构造函数，写法：子类名（子类属性）：父类名（父类属性）{额外属性定义}
    cuboid(int x, int y, int z): rectangle(x, y) {
        this->height = z;
    }
    //计算表面积的函数
    int area() { //注意不能用this->area()，否则调用的是这个函数，要用this->rectangle::area()，明确是父类中的area()函数
        return (this->rectangle::area() + this->height * this->getlength() +
                this->height * this->getwidth()) * 2; //循环调用area
    }
};
int main() {
    int x, y, z;
    cin >> x >> y >> z;
    cuboid a(x, y, z);
    cout << a.rectangle::area() << '\n' << a.area();
    return 0;
}