CS1 Unit 9 Review

In row-major two-dimensional lists, when accessing an element, the __________ is always listed first.

• dimension

• row

• length

• column

What is the element at [2][3]?

(a)  

What is the element at [2][2]?

(a)  

Which of the following is true about lists?

• Elements refer to the locations of a piece of data in the list

• Lists can only be one-dimensional

• Indexes refer to the locations of a piece of data in the list

• The first number when accessing a two-dimensional list gives the column number

Which of the following lines of code correctly create a two-dimensional list?

• stuff = [3, 4, 5], [6, 3, 1]

• stuff = [3, 4, 5] + [6, 3, 1]

• stuff = [3, 4, 5][6, 3, 1]

• stuff = [[3, 4, 5],[6, 3, 1]]

Consider the following code:

What are the dimensions of the grid (row x column)?

• 2 x 3

• 3 x 2

• 2 x 1

• 1 x 3

Consider the following code:

What is output by the code?

• 47

• 33

• 42

• 12

Consider the following code:

How many rows does the two-dimensional list now contain?

(a)  

Consider the following code:

What is output by the code?

• hedgehog

• frog

• fish

• emu

Which of the following statements are true?

• Two-dimensional lists have to store the same type of element across each row

• Two-dimensional lists have to store the same type of element across each column

• Numerical calculations on two-dimensional lists require two for loops

• Numerical calculations can be performed using a single for loop on two-dimensional lists