우분투에서 C++ 프로그래밍에 대해서 질문드립니다.

#include <string>
#include <iostream>
using namespace std;
 
const int max_len = 255;
 
class string {
public:
        void assign(const char* st)
                { strcpy(s, st); len = strlen(st); }
        int length() { return len; }
        void print() { cout << s << "\nLength: " << len << "\n"; }
private:
        char s[max_len];
        int len;
};
 
int main()
{
        string one, two;
        char three[40] = {"My name is Charles Babbage."};
 
        one.assign("My name is Alan Turing.");
        two.assign(three);
        cout << three;
        cout << "\nLength: " << strlen(three) << endl;
 
        if(one.length() <= two.length())
                one.print();
        else
                two.print();
}