simple date class

mydate.h

#ifndef DATE_H
#define DATE_H
/* Sarverott 2020 */
//#include <iostream>

//using namespace std;

class date{
    public:
        int year=0;
        int month=0;
        int day=0;
        date(){
            //cout<<"###DATE created!###\n";
        }
        ~date(){
            //cout<<"###DATE destroyed!###\n";
        }
        //date(int y, int m, int d){
        //    insertData(y, m, d);
        //}
        date(char* line){
            //cout<<"###DATE created!###\n";
            insertData(line);
        }
        void insertData(char* line){
            int i=0;
            int multiplier=10;
            this->year=0;
            while(*line!='-'){
                this->year*=multiplier;
                this->year+=*line-'0';
                line++;
            }
            this->month=0;
            while(*line!='-'){
                this->month*=multiplier;
                this->month+=*line-'0';
                line++;
            }
            this->day=0;
            while(*line!='\0'){
                this->day*=multiplier;
                this->day+=*line-'0';
                line++;
            }
        }
        char* toString(){
            char* output=new char();
            char* flag=output;
            *flag='0'+year/1000;
            flag++;
            *flag='0'+year/100%10;
            flag++;
            *flag='0'+year/10%10;
            flag++;
            *flag='0'+year%10;
            flag++;
            *flag='-';
            flag++;
            *flag='0'+month/10;
            flag++;
            *flag='0'+month%10;
            flag++;
            *flag='-';
            flag++;
            *flag='0'+day/10;
            flag++;
            *flag='0'+day%10;
            flag++;
            *flag='\0';
            return output;
        }
        int toInt(){
            return day+month*31+year*31*12;//nie wa¿na niezgodnoœæ z iloœci¹ dni, wa¿na hierarchia rok>miesi¹c>dzieñ
        }
};

#endif // DATE_H