类Class

#include <iostream>

using namespace std; // 以使用cout

class Box {
public:
    int length ;
    int height;
    int width;

    void box_set_size(int l, int h, int w);
    int box_info(void);
};

void Box::box_set_size(int l, int h, int w) {
    length  = l;
    height = h;
    width = w;
}

int Box::box_info(void) {
    return length  * height * width;
}

int main() {
    Box box1;
    box1.box_set_size(1,2,3);
    cout << "size:" << box1.box_info() << endl;
    return 0;
}