#include <iostream>
using namespace std;

class Cube {
    
//定义属性
private:
    int length, width, height; //成员变量
//定义方法
public:
    void setLength(int l){  //设置长
        length = l;
    }
    
    void setWidth(int w){ //设置宽
        width = w;
    }
    
    void setHeight(int h){ //设置高
        height = h;
    }
    
    int getLength(){ //获取长
        return length;
    }
    
    int getWidth(){ //获取宽
        return width;
    }
    
    int getHeight(){  //获取高
        return height;
    }
    //计算表面积（6个面的面积之和）
    int getArea(){ //获取表面积
        return 2 * (length * width + length * height + width * height); //表面公式
    }
    //计算体积（长*宽*高）
    int getVolume(){ //获取体积
        return length * width * height; //体积公式
    }
};

int main() {

    int length, width, height; //输入长宽高
    cin >> length;
    cin >> width;
    cin >> height;

    Cube c; //将长宽高输入到类中
    c.setLength(length);
    c.setWidth(width);
    c.setHeight(height);
    //获取长宽高及表面积体积
    cout << c.getLength() << " "
        << c.getWidth() << " "
        << c.getHeight() << " "
        << c.getArea() << " "
        << c.getVolume() << endl;
    return 0;
}

或

#include <bits/stdc++.h>
#include <iostream>
using namespace std;

class Cube {

    // write your code here......
    private:
    int length;
    int width;
    int height;

    public:
    void setLength(int length){
        this -> length = length;
    }
    void setWidth(int width){
        this -> width = width;
    }
    void setHeight(int height){
        this -> height = height;
    }
    int getLength(){
        return this -> length;
    }
    int getWidth(){
        return this -> width;
    }
    int getHeight(){
        return this -> height;
    }
    int getArea(){
        return 2*(this -> length * this -> width + this -> length * this -> height + this -> width * this -> height);
    }
    int getVolume(){
        return this -> length * this -> width * this -> height;
    }

};

int main() {

    int length, width, height;
    cin >> length;
    cin >> width;
    cin >> height;

    Cube c;
    c.setLength(length);
    c.setWidth(width);
    c.setHeight(height);

    cout << c.getLength() << " "
        << c.getWidth() << " "
        << c.getHeight() << " "
        << c.getArea() << " "
        << c.getVolume() << endl;

    return 0;
}