OOP Create Calender Taking user data input from main

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Object 
 Start with the date structure in Exercise 5 in Chapter 4 and transform it into a date
class. Its member data should consist of three ints: month, day, and year. It should also
have two member functions: getdate(), which allows the user to enter a date in
12/31/02 format, and showdate(), which displays the date.
Source Code

#include <iostream>

using namespace std;

class calender

{

private:

       int day,month,year;

public:

      

       calender()

       {

       day=0;

       month=0;

       year=0;

      

       }

       void calculate(int a,int b,int c)

       {day=a;

       month=b;

       year=c;

       ///////////////////////// Days ////////////////////

              do

              {

              month=month+1;

              day=day-30;

              }while(day>30);

       /////////////////////// Month ////////////////////

              do

              {

              year=year++;

              month=month-12;

              }while(month>12);

             

              if(month==0)

              {

              month++;

              }

       ////////////////////// Year //////////////////////

       }

       void showdata()

       {

              system("cls");

              cout<<"\tMydays calender"<<endl;

       cout<<"\t"<<day<<" "<<month<<" "<<year<<" "<<endl;

       }

};

void main()

{

       calender cal;

       int dd,mm,yy;

              cout<<"Enter Days"<<endl;

       cin>>dd;

              cout<<"Enter Month"<<endl;

       cin>>mm;

              cout<<"Enter Year"<<endl;

       cin>>yy;

       cal.calculate(dd,mm,yy);

       cal.showdata();

}

Output: