Chapter 10

Find the errors in the following class and explain how to correct them: class Example { public: Example( int y = 10 ) : data( y ) { // empty body } // end Example constructor int getIncrementedData() const { return data++; } // end function getIncrementedData [Page 569] static int getCount() { cout << "Data is " << data << endl; return count; } // end function getCount private: int data; static int count; }; // end class Example

Compare and contrast dynamic memory allocation and deallocation operators new, new [], delete and delete [].

Can a correct Time class definition include both of the following constructors? If not, explain why not. Time( int h = 0, int m = 0, int s = 0 ); Time();

Create a savingsAccount class. Use a static data member annualinterestRate to store the annual interest rate for each of the savers. Each member of the class contains a private data member savingsBatance indicating the amount the saver currently has on deposit. Provide member function calculateMonthlyInterest that calculates the monthly interest by multiplying the balance by annualinterestRate divided by \(12 ;\) this interest should be added to savingsBalance. Provide a static member function modifyInterestrate that sets the static annualtnterestrate to a new value. Write a driver program to test class SavingsAccount. Instantiate two different objects of class SavingsAccount, saver1 and saver2, with balances of \(\$ 2000.00\) and \(\$ 3000.00,\) respectively. Set the annualtnterestRate to 3 percent. Then calculate the monthly interest and print the new balances for each of the savers. Then set the annualtnterestRate to 4 percent, calculate the next month's interest and print the new balances for each of the savers.

Create class Integerset for which each object can hold integers in the range 0 through \(100 .\) A set is represented internally as an array of ones and zeros. Array element al i 1 is 1 if integer \(i\) is in the set. Array element al \(j\) ] is 0 if integer \(j\) is not in the set. The default constructor initializes a set to the socalled "empty set," i.e., a set whose array representation contains all zeros. Provide member functions for the common set operations. For example, provide a unionofsets member function that creates a third set that is the settheoretic union of two existing sets (i.e., an element of the third set's array is set to 1 if that element is 1 in either or both of the existing sets, and an element of the third set's array is set to 0 if that element is 0 in each of the existing sets). Provide an intersectionofsets member function which creates a third set which is the set-theoretic intersection of two existing sets (i.e., an element of the third set's array is set to 0 if that element is 0 in either or both of the existing sets, and an element of the third set's array is set to 1 if that element is 1 in each of the existing sets). Provide an insertElement member function that inserts a new integer \(k\) into a set (by setting al \(k\) ) to 1 ). Provide a deleteElement member function that deletes integer \(m\) (by setting al \(m\) ) to 0 ). Provide a printset member function that prints a set as a list of numbers separated by spaces. Print only those elements that are present in the set (i.e., their position in the array has a value of 1). Print \(\ldots\) for an empty set. Provide an isEqualto member function that determines whether two sets are equal. Provide an additional constructor that receives an array of integers and the size of that array and uses the array to initialize a set object. Now write a driver program to test your rntegerset class. Instantiate several Integerset objects. Test that all your member functions work properly.