void fillCard ( Card cardInfo[],int &numberBooks)
{
        cout<<"Please enter the ID number of the book: ";
        scanf(" %d",&cardInfo[numberBooks].bookID);
        fflush(stdin);
        cout<<endl;
        cout<<"Please enter the title of the book: ";
        scanf(" %s",cardInfo[numberBooks].title );
        fflush(stdin);
        cout<<endl;
        cout<<"Please enter the authors name: ";
        scanf(" %s",cardInfo[numberBooks].authors[numberBooks]);
        fflush(stdin);
        cout <<endl;
        cout <<"Please enter the ISBN-10 of the book you wish to add, if the ISBN contains an X substitute the X for the value of 10: ";
        cin >> cardInfo[numberBooks].isbn_10;
        scanf(" %d",&cardInfo[numberBooks].isbn_10);
        fflush(stdin);
        cout <<endl;
        cout <<"Please enter the ISBN-13 of the book you wish to add: " ;
        scanf(" %d",&cardInfo[numberBooks].isbn_13);
        fflush(stdin);
        cout<<endl;
        cout << "Please enter the amount of copies of this books we have : " ;
        scanf(" %d",&cardInfo[numberBooks].copies);
        fflush(stdin);
        cout<<endl;
        cout << "The amount of copies this book has: " << cardInfo[numberBooks].copies << endl;
        cardInfo[numberBooks].numberBorrowers=0;
        numberBooks++;
}