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21. You overload an operator by naming it a
variable
built-in type
function
class
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22. Assuming you have properly overloaded the ! operator for a Number class, and that a and b are two members of the Number class, which expression is legal?
a!
b!
a!b
All of these
23. To perform multiple arithmetic operations in a single statement, overloaded operator functions should return
void
a copy of the values passed to them
an object of the class type
address of the function
24. Which of the following is the best function prototype for an overloaded ........... for a Number class?
Number operator-(const Number & num)
Number & operator-(int num)
int Number (operator-())
void operator-(Number & num)
25. The programming language feature that allows the same operation to be carried out differently depending on the object is
polymorphism
inheritance
allocation
mangling
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