Which of the following is a measure of image clarity?
A. pixel
B. dpi
C. pitch
D. inch
Answer: C
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Modify the TelephoneNumber class described in Exercise 6 so that it is serializable. Write a program that creates an array whose base type is TelephoneNumber by reading data from the keyboard. Write the array to a binary file using the method writeObject. Then read the data from the file using the method readObject and display the information to the screen. Allow the user to change, add, or delete any telephone number until he or she indicates that all changes are complete. Then write the modified telephone numbers to the file, replacing its original contents.
One difficulty in the solution to this project is that we have not yet seen the collection classes. We will read the telephone numbers into an array. We either need to determine the number of objects in the file or expand the array as we read the objects. This solution reads the file twice, once to determine the number of objects and then to read the objects into an appropriately sized array. Once this is done, we make a single change and then write the file back out.
A code used by an ice cream store to order its products is 12DRM215-220. This code is deciphered in this manner: 12 stands for the count of items in the box, DRM stands for Dreamcicles (a particular kind of ice cream novelty), and 215-220 indicates the entire class of low-fat products carried by the distributor.
a. What kind of code is used? Describe the purpose behind each part (12, DRM, 215-220). b. Construct a coded entry using the same format and logic for an ice cream novelty called Pigeon Bars, which come in a six-count package and are not low-fat. c. Construct a coded entry using the same format and logic for an ice cream novelty called Airwhips, which come in a 24-count package and are low-fat.
Write recursive function mazeTraverse to walk through the maze. The function should receive arguments that include a 12-by-12 character array representing the maze and the starting location of the maze. As mazeTraverse attempts to locate the exit from the maze, it should place the character X in each square in the path. The function should display the maze after each move, so the user can watch
as the maze is solved. (Maze Traversal) The grid of hashes (#) and dots (.) in Fig. 7.22 is a two-dimensional array representation of a maze. In the two-dimensional array, the hashes represent the walls of the maze and the dots represent squares in the possible paths through the maze. Moves can be made only to a location in the array that contains a dot.  There is a simple algorithm for walking through a maze that guarantees finding the exit (assuming that there is an exit). If there is not an exit, you’ll arrive at the starting location again. Place your right hand on the wall to your right and begin walking forward. Never remove your hand from the wall. If the maze turns to the right, you follow the wall to the right. As long as you do not remove your hand from the wall, eventually you’ll arrive at the exit of the maze. There may be a shorter path than the one you have taken, but you are guaranteed to get out of the maze if you follow the algorithm.
Using the Enter key to confirm a cell entry makes the cell to the right the active cell
Indicate whether the statement is true or false.