Data Types / Binary

Question 1

primitive data type

Answer 1

a basic data type provided by the programming language as a basic building block

Question 2

types of primitive data types (5)

Answer 2

integer
real/float
boolean
character
string

Question 3

denary

Answer 3

base 10 number. uses the combination of ten symbols to represent any number

Question 4

binary

Answer 4

base 2 number. uses the combination of 2 symbols (0 or 1) to represent every number

Question 5

hexadecimals

Answer 5

based 16 number. uses the combination of 16 symbols (10 numbers and 6 letters) to represent every number

Question 6

why use hexadecimal?

Answer 6

easier to read/ remember
quicker to write/type
less chance of making an error
easy to convert

Question 7

uses of hex

Answer 7

define colours
in MAC addresses
in assembly language and machine code

Question 8

integer

Answer 8

any positive or negative whole number e.g. 3, 0, -14

Question 9

real (floating point)

Answer 9

a positive or negative number with a fractional component e.g. 0.002 or -1.98

Question 10

character

Answer 10

Any single letter, symbol, number, character or control character

Question 11

string

Answer 11

any combination of letters, symbols, numbers, characters or control characters e.g. Hello, £4.56

Question 12

Boolean

Answer 12

Any true/ false data types which often represent logical situations

Question 13

Sign magnitude most significant bit

Answer 13

represents + or -
+ = negative
- = positive

Question 14

0.1

Answer 14

positive

Question 15

1.0

Answer 15

Negative

Question 16

fixed point binary

Answer 16

positive of the binary point is fixed on the number line

Question 17

by changing the position of the binary point you can…

Answer 17

increase the size of the number

increase the accuracy of the number

Question 18

mantissa

Answer 18

the actual number you want to store

Question 19

exponent

Answer 19

positive of the binary point is fixed on the number line

Question 20

how to convert floating point binary to denary

Answer 20

1) First work out the denary number in the exponent which tells us that the binary point moves ‘n’ places to the right

2) Write out a new binary weighting line with the point in the right place and then convert into denary

Question 21

Binary -> denary positive exponent

Answer 21

Right

Question 22

Binary -> denary negative exponent

Answer 22

Left

Question 23

in two’s complement the sign is stored in

Answer 23

the most significant bit

Question 24

normalising a number

Answer 24

means that there is only one way to represent the number

Question 25

advantage of normalisation

Answer 25

it stores the most accurate version of that number.