5/22 C++: class Square

#include <iostream>
using namespace std;

class Square{
    public:
        // 資料(變數部分)
        int len;

        // 功能(函式部分)
        // (X) int area(int len){
        int area(){
            return len * len;
        }
};


int main(){
    Square s1 = {10};
    Square s2;
    s2.len = 20;

    cout << s1.area() << endl;
    cout << s2.area() << endl;

    return 0;
}