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- This line includes mixed mode arithmetic, in that a floating point
- value, 0.5, is subtracted from the Fraction object "y". The
- floating point value is converted to a Fraction using a
- constructor provided by the Fraction class. It is the second
- argument of the overloaded minus operator. When a binary operator
- is implemented as a member function, only the second argument can
- be converted. The first argument must be a Fraction object.
-