1.4.1 Data types

Question 1

What are the three types of bitwise shifts?

Answer 1

Logical shift

Arithmetic shift

Circular shift

Question 2

Explain a logical shift

Answer 2

All binary bits move the number of stated places to the left or right

It doesn’t account for the sign bit

Question 3

How is a logical shift padded?

Answer 3

MSB/LSB is padded with a 0

Question 4

Explain an arithmetic shift

Answer 4

All binary bits move the stated number of places to the left or right

It accounts for the sign bit

Question 5

What is the effect of an arithmetic shift?

Answer 5

Each shifted place is a factor of 2, left multiplies, right divides

Question 6

How is an arithmetic shift padded?

Answer 6

The MSB is padded with a 0 for a positive or a 1 for a negative

Question 7

Explain a circular shift

Answer 7

The LSB becomes the MSB, or vice versa

Question 8

What is the effect of a circular shift?

Answer 8

No bits are lost

Question 9

What are the three types of binary masks?

Answer 9

AND

OR

XOR

Question 10

What is the purpose of an AND mask?

Answer 10

Extracts a subset of bits in the value

Question 11

What is the purpose of an OR mask?

Answer 11

Sets a subset of bits to the value

Question 12

What is the purpose of an XOR mask?

Answer 12

Toggles a subset of the bits