AP Computer Science- Binary and Hex
00000000
0 in binary
What are the 16 numbers used by hexadecimal?
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F
00000001
1 in 8 bit binary
10000000
128 in 8 bit binary
00010000
16 in 8 bit binary
11111111
255 in binary
00000011
3 in 8 bit binary
01000001
65 in 8 bit binary
00000111
7 in 8 bit binary
What is hexadecimal?
A base-16 number system used in computer science
Bit
A binary digit, either 0 or 1.
Byte
A group of eight bits.
ASCII
A type of binary that can represent letters
Binary
A way of storing information using only 1s and 0s.
binary
What is the lowest level language within a computer?
Base 2
binary
hex AA
decimal 170
hexadecimal 14
decimal 20
hex 5A
decimal 90
Base 10
decimal number system
decimal 5
hex 5
decimal 101
hex 65
decimal 180
hex B4
decimal 40
hexadecimal 28
How to convert from binary to hexadecimal.
split the number into two nibbles, work out the denary equivalent, then convert into hexadecimal by multiplying the first number by 16 and adding the rest on.
255
Highest representable number in 8 bit binary
Why is hexadecimal used?
It is used to simplify binary, and simplify writing numbers.
When is hexadecimal used?
It is used when writing colours, and identifying errors on a computer.
