Computer Science Principles Lists Loops Traversals

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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;

Jose is writing a reply function for a text messaging app. He'd like to swap the sender and receiver so that the value currently in variable From ends up as the value in To and To ends up in From

Which of the following code segments will correctly swap the values as described?

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A programmer wrote an essay for his history class, and realized he has confused the names of Benjamin Franklin and Alexander Graham Bell. Instead of going through the whole paper and changing the names, he used the following incorrect algorithm in an attempt replace every occurrence of "Benjamin Franklin" with "Alexander Graham Bell" and vise versa:

First, change all occurrences of "Benjamin Franklin" to "apple" Then, change all occurrences of "apple" to "Alexander Graham Bell". Then, change all occurrences of "Alexander Graham Bell" to "Benjamin Franklin".

Here is an example of one of the sentences from the paper:

Alexander Graham Bell was born 141 years before Benjamin Franklin, so he was never able to telephone his neighbors.

Which of the following is the result of running the described incorrect algorithm on the sentence above?

• Benjamin Franklin was born 141 years before Alexander Graham Bell, so he was never able to telephone his neighbors.

• apple was born 141 years before Benjamin Franklin, so he was never able to telephone his neighbors.

• Alexander Graham Bell was born 141 years before apple, so he was never able to telephone his neighbors.

• Benjamin Franklin was born 141 years before Benjamin Franklin, so he was never able to telephone his neighbors.

• Alexander Graham Bell was born 141 years before Alexander Graham Bell, so he was never able to telephone his neighbors.

Which of the following images is the most likely outcome of the drawing?

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What is displayed by the console.log statement after the following code segment executes?

• value is: 2

• value is: 2.3333333

• value is: 3

• value is: 4

• value is: c

A student decides to draw a series of three dots (sort of like a snowman) as shown in the diagram. She wants each dot to be half the radius of the previous dot, and for the center to be on the edge of the dot below it. She writes the following code segment to do it.

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What is the output to the console after the following code segment is executed?

• -2

• 3

• 5

• 8

• Error. Unknown Identifier: x

What is the output to the console after the following code segment is executed?

• 5

• 8

• 10

• 13

• Error. Cannot make a new variable x inside function increase()

Consider the following flow chart showing a process for program execution. Given that a = 5, and b = 10, what will be displayed by the program?

• a is bigger

• b

• 5

• 10

• Nothing will be displayed