factorial cpp

/*program to calculate the factorial of a number */

#include <iostream>

using namespace std;
class factorial
{
    private:
        long int fact,number;
    public:
        void getdata()
        {
            wrong:
            cout<<"\nENTER A POSITIVE INTEGER : ";
            cin>>number;
            while(number<0)
            {
                cout<<"WRONG INPUT!";
                cout<<"\nENTER A POSITIVE INTEGER : ";
                cin>>number;
            }
            fact=1;
        }
        void calculate()
        {
            int i=1;
            if(number==0 || number==1)
            {
                cout<<"\nTHE FACTORIAL OF "<<number<<" IS : 1";
            }
            else
            {
                for(i=1;i<=number;i++)
                {
                    fact=fact*i;
                }
                cout<<"\nTHE FACTORIAL OF "<<number<<" IS : "<<fact;
            }
        }
};

int main()
{
    factorial f1;
    int cont=0;
    do
    {
        f1.getdata();
        f1.calculate();
        cout<<"\nDO YOU WANT TO CHECK AGAIN (1/0):";
        cin>>cont;
    }while(cont==1);
    return 0;
}

/***************************OUTPUT*************************************

ENTER A POSITIVE INTEGER : 5

THE FACTORIAL OF 5 IS : 120
DO YOU WANT TO CHECK AGAIN (1/0):1

ENTER A POSITIVE INTEGER : 12

THE FACTORIAL OF 12 IS : 479001600
DO YOU WANT TO CHECK AGAIN (1/0):0

Process returned 0 (0x0)
Press any key to continue.
*/