Data storage

Question 1

Name 5 different data types

Answer 1

Numbers, text, audio, images, and video

Question 2

What is a bit pattern

Answer 2

A string of bits

Question 3

What representation is used to store an integer

Answer 3

fixed-point representation (no decimals only float)

Question 4

What is an unsigned integer

Answer 4

An integer that can never be negative and only has 0 to positive values. Its range is between 0 and +ve infinity.

Question 5

What is the largest constant unsigned integer called

Answer 5

maximum unsigned integer

Question 6

What is the formula to work out the maximum unsigned integer

Answer 6

2^n-1, where n is the number of bits

Question 7

How does the storing of unsigned integers work

Answer 7

1. The integer is changed to binary
2. If the number of bits is less than n, 0s are added to the left of the binary value but if the number of bits is greater than n, the integer can not be stored and the condition overflow will occur.

Question 8

Will the integer 258 store in a 16-bit memory allocation

Answer 8

256= (100000010), therefore yes as there are 7 spaces for 0 and 1s left so we will add 7 0s to the left which will equal (0000000100000010)

Question 9

what is overflow

Answer 9

When the data that is being stored is greater than the amount of space provided so data is lost
e.g. storing 15 in a 4-bit memory location 15=(10100) and it will only store (0100) so the value will change because of overflow and now it equals 4 and not 15.

Question 10

How doe sign-and-magnitude representation work

Answer 10

1. find the range( 0-2^n -1)
2. if it’s positive it will end with0 on the left and if it’s negative it will end with a 1.
3. see how big the bit location is and minus 1

Question 11

How do you store an integer in twos complement format

Answer 11

1. Integer is changed to binary
2. If the integer is positive or zero, it stores as it is however if its negative the computer stores the two’s complement of the integer

Question 12

How does retrieving an integer in twos complement format work

Answer 12

1. If the leftmost bit is 1; twos complement is applied; if zero no operation is applied
2. The computer changes the integer to decimal

Question 13

What are the three parts of floating-point representation

Answer 13

[sign][shifter][Fixed-pointer number)
e.g.
+7 425 000 000 000. 000
sign[+]shifter[12]fixed-point part[7.425]

Question 14

what the number(1011 000 000.00) in floating-point format

Answer 14

1.011 x 2^12