notes:bit, byte & hexadecimal

hexadecimal is a neat way to represent binary

• one single hexadecimal value can represent up to 4 bits

  • 0b0000=0x1

  • 0b1111=0xF

• 1 bytes = 8 bits = 2 hexadecimal values

bitwise operator

• shift left >>: shift number of bits to the left

  • 10 >> 1 = 1

• shift right <<: shift number of bits to the right

  • 10 << 1 = 100

• and &

  • a	b	a & b
    1	1	1
    0	1	0
    0	1	0
    0	0	0

• or |

  • a	b	a | b
    0	0	0
    0	1	1
    1	0	1
    1	1	1

• not !

  • a	!a
    1	0
    0	1

• exclusive or ^

  • a	b	a ^ b
    0	0	0
    0	1	1
    1	0	1
    1	1	0