AP Computer Science: Levels A and AB by Roselyn Teukolsky, M.S.

By Roselyn Teukolsky, M.S.

The recent fourth version of Barron’s complicated Placement computing device technological know-how try coaching guide has been up to date with a brand new case examine. This new GridWorld Case research should be confirmed at the AP examination beginning in may perhaps 2008. The guide offers 4 full-length AP perform tests, every one for degrees A and AB. of those tests are provided as diagnostic assessments, with charts detailing the subjects for every query. All 4 version exams have questions replied and defined. potential attempt takers also will locate an intensive topic overview, beginning with a evaluate of Java 5.0 and happening to hide all subject matters wondered in either the extent A and point AB tests. There are new sections on garage of numbers and random numbers. The guide can be bought on my own, or with an non-compulsory CD-ROM, with its extra full-length version AP checks, one point A and the opposite point AB, see Barron’s ISBN 0-7641-9350-3.
*The CD-ROM isn't really integrated with the electronic model of this e-book.

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Which is a reasonable data structure for a BingoCard object? Recall that a BingoCard has 20 integers from 0 to 90, with no duplicates. , one where all the numbers have been crossed off). I int[] myBingoCard; //will contain 20 integers //myBingoCard[k] is crossed off by setting it to -1. int numCrossedOff; //player wins when numCrossedOff reaches 20. II boolean[] myBingoCard; //will contain 91 boolean values, of which int numCrossedOff; //20 are true. All the other values are false. //Thus, if myBingoCard[k] is true, then k is //on the card, 0 <= k <= 90.

Private void shuffleNumbers() { /* implementation not shown */ } } When the programmer tests the constructor of the Caller class she gets a NullPointerException. Which could be the cause of this error? (A) The Caller object in the driver class was not created with new. (B) The programmer forgot the return statement in getList that returns the list of Integers. (C) The declaration of myNumbers is incorrect. It needed to be private ArrayList myNumbers = null; (D) In the getList method, an attempt was made to add an Integer to an ArrayList that had not been created with new.

Hopefully you eliminated it immediately! 34. RIGHT is 90. HALF_RIGHT. Choice A could happen if the Bug is facing northeast, for example, at its turn to move. If there are no obstacles in its path, the Bug will keep moving in that direction, on a diagonal path. For choice B, refer to the bug’s canMove method, and notice that the Bug can move either into an empty location or onto a Flower. It may not, however, move onto a Rock, so choice C is true. Choice E will happen whenever a Bug is blocked in all adjacent locations, either by an actor other than a Flower or an edge of the grid.

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