unit 3-4 ap comp sci

A programmer wants to determine whether a score is within 10 points of a given target. For example, if the target is 50, then the scores 40, 44, 50, 58, and 60 are all within 10 points of the target, while 38 and 61 are not.Which of the following Boolean expressions will evaluate to true if and only if score is within 10 points of target ?

• (score ≤ target + 10) AND (target + 10 ≤ score)

• (target + 10 ≤ score) AND (score ≤ target - 10)

• (score ≤ target - 10) AND (score ≤ target + 10)

• (target - 10 ≤ score) AND (score ≤ target + 10)

Which of the following are benefits of using well-named variables in a computer program?

• The program will run faster.

• The program will be easier for people to read.

• The program will have a greater data storage capacity.

• The program will be easier to modify in the future.

A student is writing a program to model different real-world events using simulations. Which of the following simulations will generate a result that would best be stored using a Boolean variable?

• A simulation of flipping a fair coin

• A simulation of rolling a fair die (with sides numbered 1 through 6)

• A simulation of the temperature in a location over time

• A simulation of traffic patterns on a road

The following spinner is used in a game. The region labeled "blue" represents of the spinner. The regions labeled "orange" and "purple" are equal in size.

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The following procedure is intended to return true if at least two of the three parameters are equal in value and is intended to return false otherwise.

For which of the following procedure calls does the procedure NOT return the intended value?

• AnyPairs ("bat", "cat", "rat")

• AnyPairs ("bat", "bat", "rat")

• AnyPairs ("bat", "cat", "bat")

• AnyPairs ("bat", "cat", "cat")

Consider the following spinner, which is used to determine how pieces are to be moved on a game board. The region labeled "Move 1 space" is six times as large as each of the other two regions Which of the following code segments can be used to simulate the behavior of the spinner?

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In a certain science experiment, percent of trials are expected to be successful and  percent of trials are expected to be unsuccessful. The program below is intended to simulate the results of repeated trials of the experiment. Which of the following can be used to replace  so that the simulation works as intended?

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For which of the following grids does the program NOT correctly move the robot to the gray square?

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The following table shows the value of expression based on the values of input1 and input2.

• (NOT input1) OR (NOT input2)

• (NOT input1) AND (NOT input2)

• NOT (input1 OR input2)

• NOT (input1 AND input2)

Assume that the variables alpha and beta each are initialized with a numeric value.

1. Which of the following code segments can be used to interchange the values of alpha and beta using the temporary variable temp ?

   
   

• I and II only

• I and III only

• II and III only

• I, II, and III