AP Computer Science Principles (Final Exam part 2)

ASCII is a character-encoding scheme that uses a numeric value to represent each character. For example, the uppercase letter “G” is represented by the decimal (base 10) value 71. A partial list of characters and their corresponding ASCII values are shown in the table above.

ASCII characters can also be represented by binary numbers. According to ASCII character encoding, which of the following letters is represented by the binary (base 2) number 1010100?

• N

• P

• T

• W

Jasmine is writing a shopping app. She has created a variable to keep track of the number of items in the shopping cart. Every time someone clicks the "addItemButton", she would like the variable to increase by 1.

What code should Jasmine insert where it says <missing code> in order for her app to work?

• cart total = 1;

• cartTotal + 1;

• cartTotal = cartTotal +1;

• var cartTotal = cartTotal + 1;

• var cartTotal + 1;

What is a possible output when the following code segment executes? The ending position of the turtle is shown in each diagram. The starting position is shown as a white triangle in cases where the turtle starts and ends in different locations.

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A Boolean expression is an expression that evaluates to which of the of the following?

• Yes/Maybe/No

• True/False

• Any Integer

• Integers between 1 and 10

• Any single character

Consider the following segment given in pseudo code. What will be displayed if grade is set to 70?

• You passed!

• Time to start studying again!

• You passed! and Time to start studying again!

• Nothing will be displayed

• An error will occur on line 7; you cannot have an IF inside an ELSE statement

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Which of the following is true about while loops ?

• While loops terminate after a fixed number of loops that is pre-determined

• While loops terminate after a fixed number of loops that is determined after the loop executes once.

• While loops run as long as a given boolean condition is true.

• While loops run as long as a given boolean condition is false.

• While loops are known as "forever loops" and never stop until the program is halted by the user.

  Answer

Which variable is named correctly?

• BlueFish

• Bluefish

• blueFish

• BLUEFISH

Which of the following is the best definition for callback function

•  Program designed to run blocks of code or functions in response to specified events (e.g. a mouse click)
• Coding tasks involved in making your app respond to events by triggering functions.
• Function specified as part of an event listener; it is written by the programmer but called by the system as the result of an event trigger.
• A command (onEvent in App Lab) that can be set up to trigger a function when a particular type of event occurs on a particular UI element.

What is a Conditional Statement?

• A part of the code that allows you to perform different actions depending on which is true or false

• A variable that has a value of true or false

• A part of the code that tells you if a value is less than another value

• A part of the code that tests whether or not two values are equal