Maya calendar in C ++

So, I have an appointment where I have to code the Mayan calendar in C ++, so that the calendar has the following functions:

argv[1] | argv[2]        |  argv[3]        | output
m+d     | Mayan date     |  number of days | Mayan date
m-d     | Mayan date     |  number of days | Mayan date
m-m     | Mayan date     |  Mayan date     | number of days
g=      | Gregorian date |                 | Mayan date
m=      | Mayan date     |                 | Gregorian date

The first operation m + d takes the Mayan date and the number of days. the operation adds the number of days to the Mayan date for the production of the Mayan date as a way out. The second operation md subtracts the number of days from the Mayan date to release the Mayan date. The third mm operation calculates the number of days between two Mayan dates. The fourth operation g = converts the Gregorian date to Mayan date. The last operation m = converts the Mayan date to a Gregorian date.

Mayan calendar units are set up so that:

Days                  Long Count period         Long Count unit
1                                               1 Kin
20                    20 Kin                    1 Uinal
360                   18 Uinal                  1 Tun
7,200                 20 Tun                    1 Ka'tun
144,000               20 Ka'tun                 1 Bak'tun
2,880,000             20 Bak'tun                1 Pictun
57,600,000            20 Pictun                 1 Kalabtun
1,152,000,000         20 Kalabtun               1 K'inchiltun
23,040,000,000        20 K'inchiltun            1 Alautun

I am having trouble initializing a Mayan calendar object. Here is what I still have:

class MayanDate {
// Bak'tun, Ka'tun, etc stuff ...
unsigned int Kin = 1;
unsigned int Uinal = 20;
unsigned int Tun = 360;
unsigned int Katun = 7200;
unsigned int Baktun = 144000;
unsigned int Pictun = 2880000;
unsigned int Kalabtun = 57600000;
unsigned long Kinchiltun = 1152000000;
unsigned long Alautun = 23040000000;


public:

        MayanDate();
        MayanDate( unsigned int, unsigned int, unsigned int, unsigned int, unsigned int);

        void set( unsigned int, unsigned int, unsigned int, unsigned int, unsigned int);
        MayanDate &operator++();
        int operator-( const MayanDate &) const;
        MayanDate operator+( unsigned int ) const;
        MayanDate operator-( unsigned int) const;
        bool operator==( const MayanDate & ) const;
        bool operator!=(const MayanDate & m ) const;
        void get_string( char*, unsigned int) const;
};

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