AP CSP Unit 4 Flashcard REVIEW

Front

What number will be output by the console.log command on line 7?

Back

100

Answer explanation

The variable bop is initialized on line 2. On line 3, the variable bop is assigned the value 10. On line 5, the variable bop is assigned the value 100. Since the most recent value bop has been assigned is 100, that is the value that will be printed by the command on line 7.

Front

What number will be output by the console.log command on line 5? Options: 10, 11, 12, 13, 16

Back

16

Answer explanation

Walking through the program line by line:

On line 1, the variable oop is initialized and the value 10 is stored in it

On line 2, the variable oop is assigned its current value (10) plus 1.

On line 3, the variable oop is assigned its current value (11) plus 2.

On line 4, the variable oop is assigned its current value (13) plus 3.

On line 5, the current value assigned to oop, 16, is output.

Front

What number will be output by the console.log command on line 5? Options: 10, 25, 30, 35

Back

35

Answer explanation

Walking through the program line by line:

On line 1, the variable kit is initialized and assigned the value 20.

On line 2, the variable roo is initialized and assigned the value 10.

On line 3, the variable kit is assigned to its current value (20) plus 5.

On line 4, the variable roo is assigned to the current value of kit (25) plus the current value of roo (10).

On line 5, the current value assigned to roo, 35, is output.

Front

What text will be output by the program? Options: less than 10, less than 20, less than 30, 30 or more

Back

30 or more

Answer explanation

Walking through the program line by line:

On line 1, the variable score is initialized and assigned the value 0.

On line 2, the variable score is assigned its current value (0) plus 10. On line 3, the variable score is assigned its current value (10) plus 10. On line 4, the variable score is assigned its current value (20) plus 10.

On line 5, the boolean expression score < 10 evaluates to false since the current value of score is 30, which causes the command on line 6 to not execute.

On line 7, the boolean expression score < 20 evaluates to false since the current value of score is 30, which causes the command on line 8 to not execute.

On line 9, the boolean expression score < 30 evaluates to false since the current value of score is 30, which causes the command on line 10 to not execute.

Since all of the if-else-if statements have evaluated to false, the command inside the else statement will run and the console prints 30 or more.

Front

What text will be output by the program? Options: Output A, Output B, Output C, Output D, Output E

Back

Output D

Answer explanation

Front

"You win!" never displays. What change would fix this issue? Options: Line 1 - change variable name to totalScore, Line 3 - remove var, Line 4 - change conditional to score >= 5, Line 5 - change to a getText command

Back

Line 3 - remove var

Answer explanation

While it looks like there's only one variable being used, it actually has two variables, one local, and one global, and they're both named score. Every time button2 is clicked the local variable score is recreated and then deleted once the onEvent is done running. This means that the value of the local variable will never be greater than 5 and therefore the setText command inside the conditional statement will never execute.

Front

There is repeated code in these onEvent blocks. Choose the correct code for the updateScreen() function which would be called in each of the onEvent blocks.

Back

Answer explanation

Since this setText command and conditional statement with a setProperty command appear in both onEvent blocks, these would be the appropriate blocks to include in the updateScreen() function. While there are similarities between other blocks that appear in both onEvent blocks, these are the only ones that are used identically in both.

Front

A movie theater charges different ticket prices based on a customer's age. The prices are shown in the table below. The customer's age is stored in the variable age and the price is stored in the variable price. Which piece of code will correctly decide the price for each ticket?

Back

Answer explanation

There are multiple ways to write this conditional statement so that it correctly decides the price for each ticket. C is the only one of these choices that accomplishes that. Options A and B will assign a ticket price of $8 to anyone over the age of 12, including those 65 and older. Option D will assign a ticket price of $8 to everyone under the age of 65, including those 12 and younger.

Front

A museum charges different prices based on the day of the week and age of the visitor. The pricing rules are shown below. On Tuesday and Thursday children 10 and under get in free ($ 0). For all other days and ages the cost is ten dollars ($ 10). The visitor's age is stored in the variable age, the day of the week is stored in a variable day, and the price in dollars is stored in the variable price. Which piece of code will correctly decide the price for each ticket?

Back

Answer explanation

This is an example where English doesn’t match with Boolean logic. The phrase “On Tuesday and Thursday children 10 and under...” translates to if (day equals “Tuesday” OR day equals “Thursday”) AND (age is less than or equal to 10) in Boolean logic. The two options that express this logic are B and D. D includes an error in how the first part of the conditional statement is written. The variable day must be included on both sides of the OR symbol.

Front

What will the value of the variable bags be at the end of the flowchart shown here?

Back

2

Answer explanation