Define an input operator for the class you used in exercise 7.40 from § 7.5.1 (p. 291). Be...

Define an input operator for the class you used in exercise 7.40 from § 7.5.1 (p. 291). Be sure the operator handles input errors.

§ 7.5.1 (p. 291)

Exercise 7.36

The following initializer is in error. Identify and fix the problem.

struct X {    X (int i, int j): base(i), rem(base % j) { }    int rem, base;};

Exercise 7.37

Using the version of Sales_data from this section, determine which constructor is used to initialize each of the following variables and list the values of the data members in each object:

Sales_data first_item(cin);int main() {    Sales_data next;    Sales_data last("9-999-99999-9");}

Exercise 7.40

Choose one of the following abstractions (or an abstraction of your own choosing). Determine what data are needed in the class. Provide an appropriate set of constructors. Explain your decisions.

(a) Book
(b) Date
(c) Employee
(d) Vehicle
(e) Object
(f) Tree