Question

a. What is the result (in hex) of 0x7F and’d with 0x3A? (and gate)

b. What is the result (in hex) of 0x5A xor’d with 0x9F? (xor)

Answer 1

Hexadecimal     Binary
    0           0000
    1           0001
    2           0010
    3           0011
    4           0100
    5           0101
    6           0110
    7           0111
    8           1000
    9           1001
    A           1010
    B           1011
    C           1100
    D           1101
    E           1110
    F           1111

a)
0x7F => 0111 1111
0x3A => 0011 1010

AND Table:
------------
0 0 -> 0
0 1 -> 0
1 0 -> 0
1 1 -> 1

0111 1111
0011 1010
-----------
0011 1010 => 0x3A
-----------

Answer: 0x3A

b)
0x5A => 0101 1010
0x9F => 1001 1111

XOR Table:
------------
0 0 -> 0
0 1 -> 1
1 0 -> 1
1 1 -> 0

0101 1010
1001 1111
----------
1100 0101 => 0xC5
----------

Answer: 0xC5