Computer Science Notes v.2
2^n n is number of bits
5bits is 2^5=32
Hexadecimal means base 16
10 - A
11 - B
12 - C
13 - D
14 - E
15 - F
Convert a binary number to hexadecimal
1. Group your bits into groups of four
2. Covert each group to a Hexadecimal value
16^1= 16 16^0= 1 16x10 = 160 1x10= 10......160+10=170
10101010 = AA
8421 8421
1010 1010
A A
1000 1011 0111
8 11=B 7
Converting hexadecimal to binary
7E9
0111 1110 1001
135 convert to binary 135-128=7
128 64 32 16 8 4 2 1
1 0 0 0 0 1 1 1
Convert 345 to decimal 345-256=...
256 128 64 32 16 8 4 2 1
1 0 1 0 1 1 0 0 1
convert 101011001
0001 0101 1001
1 5 9 = 159
1+1= 0 carry the 1 so it looks like 10
9+1=10
111111
1010111
+1001011
-------------
10100010
1 1 1
1110011
+ 11001
-----------
0101000
10001100 is the flippin answer... >_<
Great subtracting while fighting to stay awake... arghhhh caffeine gave up on me...
12
0202
1010111
- 111011
------------
0011100
**teacher and vest kid are discussing calculus....wtc....hahaha I wanna burst out into laughter...oh.how I want to...LOL! sooooo boring here and the a/c broke because of rain over the weekend.
**another discussion with vest kid and teacher...talking about encrypting email because of the Patriot Act. Vest kid says hey get a hotmail...lol
COBOL & BUG =made by this old lady from about 50 years ago
**teacher made a startrek reference...what am I getting into?
Posted at 09:36 am by
lemony