Question

members of a class non-friends, non-members of a class All of the above be 13. Why do you want to usually make data members private in a class? so that no one can use the class ensure data integrity b. provide data abstraction c provide information hiding. d. e. Band D B.C and D 14. The copy constructor for a class is called when an object of the class is passed by value to a function. when an object of the class is initialized by another object of the class when a function returns an object of the class a bi all of the above 13. A data type consisting of data members and operations on those members which can be used by a programmer without knowing the imelementation details of the data type is called an abstract definition type al an available data type an abstract data type d. primitive data type 16. Developing an ADT means that the user of your class does not have to know the details about how the class is implemented. This is known as interface implementation testing and debugging b c. d. information hiding 17. In which case would you consider using a dynamic array? If the array is small, and the size is known before the program runs. a If the program needs to get the size of the array from the user b If the array size is big, but known at compile time You should always use a dynamic array c. d. 18. Which of the following function declarations will accept either cout or a file stream object as its argument? void output( fstream &outFile) al b. void output( ofstream &outFile); 第4頁共10頁

Answer 1

Answer 13- option F is correct. We make private data member for data integrity, data abstraction and information hiding but we can use them.

Answer-14- answer D is correct option. For a Copy constructor all these 3 lines fulfill criteria of copy constructor.

Answer -15: option C is correct. Abstract data types are the types which are used by programmer without knowing the implementation details.

Answer-16- option D is correct. This is called information hiding. Interface, testing and debugging, implementation are different. A,B,C wrong options.

Answer- 17- option B is correct. We use dynamic array when we don’t confirm the size of array if user want to increase size of array it will increase automatically.

Answer -18- option should be void output (ostream&outFile) it will accept either cout or a file stream object as its argument.

Answer 2

Write the implementation of class called IC. This class includes the following private data members: String variable that contains the name of the IC, e.g. AND gate, Register, MUX, etc. -Double variable that contains the price of the IC. - Integer variable that number of pins of the IC. Provide constructor function that enables an object of this class to be initialized when it is declared, set and get functions to all data members. Part2: Write a program which contains a class called DSD (Digital System Design). DSD is any digital design. The private data members of this class include the following: • String variable which contain the name of the System design. For this class you should provide the following public member functions: Provide a constructor function that enables an object of this class to be initialized when it is declared. . A dynamic array of objects from class IC which contains all ICs the design need. The size of this array can be determined by the constructor. . Also, provide a destructor that frees all dynamically allocated memory when the object is destroyed. AddIC: add an IC to the array of ICs to a specified location in this array (i.e. takes the IC object and the array index as parameters). • AvgPrice: returns the average price of all ICs in a System design. Print: to print the values of all data members in a System design. Expensive: returns the IC with the highest price in the System design. Write a program to test your classes' functionality.