class Fixed {
public:

    // Constructors

    Fixed (Long val);
    Fixed (ULong val);
    Fixed (LongLong val);
    Fixed (ULongLong val);
    ...
    Fixed (const char *);

    // Conversions

    operator LongLong () const;
    operator LongDouble () const;
    Fixed round (UShort scale) const;
    Fixed truncate (UShort scale) const;

    // Operators

    Fixed &operator = (const Fixed &val);
    Fixed &operator += (const Fixed &val);
    Fixed &operator -= (const Fixed &val);
    ...
}

Fixed operator + (const Fixed &val1, const Fixed &val2);
Fixed operator - (const Fixed &val1, const Fixed &val2);
...