Unit 6 Data Types

Question 1

What are Primitive Data Types?

Answer 1

A set of basic data types from which all other data types are constructed

Question 2

What is an Integer?

Answer 2

A whole number

Question 3

What is a Float?

Answer 3

A decimal number

Question 4

What is a Boolean?

Answer 4

True or false

Question 5

What is a Character?

Answer 5

A letter, number, or special symbol

Question 6

What is a String?

Answer 6

Anything enclosed in quote marks

Question 7

Are all Data Types held in Binary?

Answer 7

Yes

Question 8

How many digits does the Binary System use?

Answer 8

Two, 0 and 1

Question 9

What many digits does the Denary/Decimal System use?

Answer 9

Ten, 0 - 9

Question 10

What does it mean when Number Systems are referred to by their Base?

Answer 10

Base refers to how many symbols are used to construct values

Question 11

What Base is Denary?

Answer 11

Base 10

Question 12

What Base is Hexadecimal?

Answer 12

Base 16

Question 13

What Base is Binary?

Answer 13

Base 2

Question 14

How does Hexadecimal use letters?

Answer 14

It uses letters for the values 10 to 15

Question 15

Why are Hexadecimal Numbers used? (5)

Answer 15

• Easier to read than binary
• Quicker to type
• Less chance of making an error when typing compared to binary
• Used to define colours
• Easy to convert to and from binary

Question 16

What is a Byte?

Answer 16

A collection of 8 bits

Question 17

How many Bytes are in a Kilobyte?

Answer 17

10^3 or 1,000

Question 18

How many Bytes are in a Megabyte?

Answer 18

10^6 or 1,000,000

Question 19

How many Bytes are in a Gigabyte?

Answer 19

10^9 or 1,000,000,000

Question 20

How many Bytes are in a Terabyte?

Answer 20

10^12 or 1,000,000,000,000

Question 21

How many Bytes are in a Kibibyte?

Answer 21

2^10 or 1,024

Question 22

How many Bytes are in a Mebibyte?

Answer 22

2^20 or 1,048,576

Question 23

How many Bytes are in a Gibibytes?

Answer 23

2^30 or 1,073,741,824

Question 24

How many Bytes are in a Tebibyte?

Answer 24

2^40 or 1,099,511,627,776

Question 25

What does ASCII stand for?

Answer 25

American Standard Code for Information Interchange

Question 26

What Bit Character Set does ASCII have?

Answer 26

7 Bit

Question 27

How many possible Binary Codes can ASCII have?

Answer 27

2^7 or 128

Question 28

What is Unicode?

Answer 28

An international encoding standard for use with different languages and scripts, by which each letter, digit, or symbol is assigned a unique numeric value that applies across different platforms and programs

Question 29

What are examples of Arithmetic Operators? (4)

Answer 29

• Addition
• Subtraction
• Multiplication
• Division

Question 30

What are examples of Comparison Operators? (4)

Answer 30

• Equal
• Not equal
• Greater than
• Less than

Question 31

What is one method of representing negative numbers in Binary?

Answer 31

Sign and magnitude. The first bit acts as the sign, 0 for + and 1 for -

Question 32

What is the most common method of representing negative numbers in Binary?

Answer 32

Two’s Complement. The two’s complement of a signed binary value is found by flipping all of the bits and adding one

Question 33

What are Fractional values?

Answer 33

Negative powers of 2

Question 34

What is Fixed-point Binary?

Answer 34

A fixed-point binary value uses a specified number of bits where the placement of the binary point is fixed

Question 35

What is Normalisation?

Answer 35

The process of moving the binary point of a floating point number to provide the maximum level of precision for a given number of bits
This is achieved by ensuring that the first digit after the binary point is a significant digit

Question 36

What are the 2 ways Bits can be manipulated?

Answer 36

• Using shift instructions to move bits left or right
• Using logical instructions NOT, AND, OR and XOR with appropriate masks