Data representation

Question 1

What is binary?

Answer 1

Binary is a base 2 number system used in computers

Question 2

What is hexadecimal?

Answer 2

base 16 number system that uses numbers 0-9 and then letters A-F to represent the rest of the numbers until 15.
A way of representing binary in a shorter form, hexadecimal does not save memory.

Question 3

binary arithmetic

Answer 3

1+0= 1
1+1= 1-0
1+1+1= 1-1

Question 4

Character representation- ASCII

Answer 4

• ASCII (American Standard Code for Information Interchange).
• Uses 7 bits, but needs to store in in one full byte (8bits)
• Used by America and UK

Question 5

Character representation- A

Question 6

Binary shift- left

Answer 6

00000110 (6) LEFT SHIFT BY 2
Becomes
00011000 (24) 6 x2^2

Question 7

Binary shift- right

Answer 7

00001000 (8) RIGHT SHIFT BY 2
Becomes
00000010 (2) - 8/2^2