Carefully identify, define each term and give differences between the implementation and the interface of an abstract data type (ADT). This requires a bit more writing of English than other question on this test.
What will be an ideal response?
The interface consists of two sorts of things: commentary, and member function declarations. Commentary is usually at the beginning of the class definition that tells what data an object of the class represents. Typically, this will be something like a date, a bank account, or a person in a company, or the state of a simulation of some kind. In addition to this, the declaration (prototype) of each public member function should have comments that tell you all you need to know about the use of that member function. It is important that the interface of the class give all the necessary information for the use of the class and its members.
The implementation of a class tells how the class interface is realized as code. The implementation includes private members, definitions of both the public member functions and any private member functions. You need the implementation to run a program that uses the ADT.
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Recursion can be used to
A) compute factorials. B) find the greatest common divisor of two integers (GCD). C) program things that cannot be programmed without recursion. D) All of the above E) Both A and B, but not C
What names are displayed in the list box when the button is clicked on?
``` Private Sub btnDisplay_Click(...) Handles btnDisplay.Click Dim names() As String = IO.File.ReadAllLines("Data.txt") lstBox.Items.Clear() For i As Integer = (names.Count - 1) To 0 Step -2 lstBox.Items.Add(names(i)) Next End Sub ``` Assume the five lines of the file Data.txt contain the following entries: Bach, Borodin, Brahms, Beethoven, Britain. (A) Bach, Brahms, and Britain (B) Britain, Beethoven, Brahms, Borodin, and Bach (C) Bach, Borodin, Brahms, Beethoven, and Britain (D) Britain, Brahms, and Bach
For each of the following, write a single statement that performs the specified task. Assume that long variables value1 and value2 have been declared and value1 has been initialized to 200000.
a) Declare the variable longPtr to be a pointer to an object of type long. b) Assign the address of variable value1 to pointer variable longPtr. c) Print the value of the object pointed to by longPtr. d) Assign the value of the object pointed to by longPtr to variable value2. e) Print the value of value2. f) Print the address of value1. g) Print the address stored in longPtr. Is the value printed the same as value1’s address?
____ movies play animation well and play on both Macintosh and PC computers.
A. QuickTime B. Unix C. Windows Media D. Java