ADT conversions - Quiz Explanation

The correct answers are indicated below, along with the text that explains the correct answers.

1.	Explicit cast conversion is necessary:
	A.	anytime an int needs to be converted to a double
	B.	anytime any native type needs to be converted to another native type
	C.	anytime a user-defined type is used as an argument to a function
	D.	when the implicit conversion is not desired or expression is illegal otherwise
	The correct answer is D. Explicit cast conversion should rarely be used, however.

2.	A constructor is a conversion constructor if:
	A.	it takes two arguments: the "from-type" and "to-type"
	B.	it has only one "from-type" argument and the "to-type" is implied
	C.	it takes either two arguments or it takes only the "from-type" argument
	D.	the constructor has no arguments and is made for you by the compiler
	The correct answer is B. A constructor of one argument is a conversion from that argument type to the class type.

3.	To convert from a user-defined type to a built-in type, you must add a special conversion member function to the class. This member function must:
	A.	use the operator keyword in its declaration
	B.	be a static member function
	C.	have a return type
	D.	not have an empty argument list
	The correct answer is A. A member function that is designed to convert from a user-defined type to a built-in type must use the keyword operator. It must also be a nonstatic member function without a return type and with an empty argument list.