ap computer science a 2019 scoring guidelines


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PDF AP® Computer Science A Scoring Guidelines

AP® COMPUTER SCIENCE A 2019 SCORING GUIDELINES © 2019 The College Board Visit the College Board on the web: collegeboard Question 1: Calendar Part (a) public static int numberOfLeapYears(int year1 int year2) { int count = 0; for (int y = year1; y

PDF AP COMPUTER SCIENCE A Scoring Guidelines

This question involves the use of check digits which can be used to help detect if an error has occurred when a number is entered or transmitted electronically An algorithm for computing a check digit based on the digits of a number is provided in part (a) The CheckDigit class is shown below You will write two methods of the CheckDigit class

PDF AP Computer Science A Scoring Guidelines

AP ® COMPUTER SCIENCE A 2018 SCORING GUIDELINES © 2018 The College Board Visit the College Board on the Web: www collegeboard Question 1: Scoring Notes Part (a) simulate 5 points Points Rubric Criteria Responses earn the point if they Responses will not earn the point if they +1 Calls hopDistance and uses returned distance to

PDF AP Computer Science A

AP ® COMPUTER SCIENCE A 2019 SCORING GUIDELINES Apply the question assessment rubric first which always takes precedence Penalty points can only be deducted in a part of the question that has earned credit via the question rubric may have a negative point total A given penalty can be assessed only once for a question even if it occurs

PDF AP Computer Science A

AP® COMPUTER SCIENCE A 2019 SCORING GUIDELINES © 2019 The College Board Visit the College Board on the web: collegeboard Apply the question assessment rubric first which always takes precedence Penalty points can only be deducted in a part of the question that has earned credit via the question rubric No part of a question (a b c)

  • How are computational thinking practices assessed on the AP Computer Science a exam?

    The AP Computer Science A computational thinking practices are assessed on the AP Exam as detailed below. The AP Computer Science A Exam multiple-choice section includes mostly individual questions, with one or two sets of multiple questions (typically two to three questions per set).

  • Where can I find information about the AP program?

    College Board, Advanced Placement Program, AP, AP Central, and the acorn logo are registered trademarks of the College Board. Visit the College Board on the Web: www.collegeboard.org. AP Central is the oficial online home for the AP Program: apcentral.collegeboard.org Apply the question assessment rubric first, which always takes precedence.

  • Where can I find AP Computer Science a 2019 scoring guidelines?

    Visit the College Board on the eb: collegeboard.org. w Declare +1 AP COMPUTER SCIENCE A 2019 SCORING GUIDELINES Question 2: Scoring Notes (continued) Points Rubric Criteria Responses earn the point even if they... Responses will not earn the point if they... +2 averageSteps method +1 s header: public double averageSteps()

  • What is the AP Computer Science a exam?

    THIS PAGE IS INTENTIONALLY LEFT BLANK. The AP Computer Science A Exam assesses student understanding of the computational thinking practices and learning objectives outlined in the course framework. The exam is 3 hours long and includes 40 multiple-choice questions and 4 free-response questions.

Question 1: Methods and Control Structures

This question involves the use of check digits, which can be used to help detect if an error has occurred when a number is entered or transmitted electronically. An algorithm for computing a check digit, based on the digits of a number, is provided in part (a). The CheckDigit class is shown below. You will write two methods of the CheckDigit class

/** Returns true if numWithCheckDigit is valid, or false

otherwise, as described in part (b). Precondition: The number of digits in numWithCheckDigit is between two and seven, inclusive. * numWithCheckDigit >= 0 */ public static boolean isValid(int numWithCheckDigit) AP Computer Science A Course and Exam Description apcentral.collegeboard.org

Applying the Scoring Criteria

Apply the question scoring criteria first, which always takes precedence. Penalty points can only be deducted in a part of the question that has earned credit via the question rubric. No part of a question (a, b, c) may have a negative point total. given penalty can be assessed only once for a question, even if it occurs multiple times or in mul

1-Point Penalty

v) Array/collection access confusion ([] get) w) Extraneous code that causes side-effect (e.g., printing to output, incorrect precondition check) x) Local variables used but none declared y) Destruction of persistent data (e.g., changing value referenced by parameter) z) Void method or constructor that returns a value apcentral.collegeboard.org

Question 3: Array/ArrayList

The Gizmo class represents gadgets that people purchase. Some Gizmo objects are electronic and others are not. A partial definition of the Gizmo class is shown below. public class Gizmo { /** Returns the name of the manufacturer of this Gizmo. */ public String getMaker() { /* implementation not shown */ } apcentral.collegeboard.org

/** Returns true

* otherwise. */ if this Gizmo is electronic, and false public boolean isElectronic() { /* implementation not shown */ } apcentral.collegeboard.org

/** Returns true if this Gizmo is equivalent to the Gizmo

object represented by the parameter, and false otherwise. */ public boolean equals(Object other) { /* implementation not shown */ } // There may be instance variables, constructors, and methods not shown. } The OnlinePurchaseManager class manages a sequence of Gizmo objects that an individual has purchased from an online vendor. You will write two

Scoring Criteria

Accesses all elements of purchases (no bounds errors) Calls isElectronic to test whether or not a Gizmo object is electronic and getMaker to get the name of the manufacturer of a Gizmoobject apcentral.collegeboard.org

Decision Rules

Responses earn the point if they

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