84962934-AK-3
35
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Transcript of 84962934-AK-3
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1
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2
,
(, )
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3
() R
-
di
dn
dn-1
dn-2
... d1
d0
,
0
R-1.
:
R,
.
d-1
d-2
... d-m
,
:
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4
-
5
123
:
123.456
:
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6
0
1.
110010102
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7
1359:
210=1024, 211=2048, 1359 -
1024 = 335.
29=512 > 335 (10)
28=256
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8
147
,
: 1001 0011
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9
...
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10
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-
11
32-
,
0 2,147,483,647
-
.
(1000...000)2
(-2,147,483,648)10
(-231),
(-1)10
=(111...111)2
.
,
,
(-2,147,483,648)10
.
-
,
x + (-x) = 0.
1
-
(sign bit).
0
1, 1
0,
1
.
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12
-
.
-
()
.
,
.
.
(
).
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13
:
()
.
.
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14
,
.
.
,
,
,
.
,
(scientific
) ,
: *,
.
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15
IEEE 754 .
.
:
32
8
, 23
1
64
11
, 52
1
-
16
(bias)
.
32
,
127,
1023.
SM
(-1)S*(1+Mantisa)*2(Eksponenet -
Bias)
S
,
bias
-
1710
=100012
0,100012
*25
,
14
5
25=32, 16
5+16=21
17
0 00101 10001000
0 10101 10001000
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18
,
.
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19
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20
14-
-
21
-
101
00000101
000000000000101
-
1012
5.
4
8 .
01012
000001012
1010111110110010
1010 1111 1011 0010.
:
0.
.
-
22
0
7:
16-bit
0
15
:
0
low order
(L.O.) .
high order (H.O.) .
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23
(Bit) -
(Nibble) -
,
(Byte)
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24
(Word)
16
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25
(Double Word)
32
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26
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27
shift
rotate.
left shifts, left rotates,
right shifts,
right rotates.
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28
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29
.
.
.
Binary-Coded Decimal
EBCDIC
ASCII
Unicode
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30
Binary-Coded Decimal
Binary-coded decimal (BCD)
IBM
mainframe-
midrange .
4-bit
8-bit
zone
digit.
BCD
:
unsigned
1111;
1100;
1101.
40%
.
. 0.3
.
8
0.296875,
1.05%.
BCD,
1111 0011,
.
-
31
Binary-Coded Decimal
BCD
,
.
packed decimal numbers..
-1265
3
BCD.
zoned-decimal
1265 :
1111 0001 1111 0010 1111 0110 1111 0101
0001 0010 0110 0101
low-order
high-order digit
3
:
-
32
EBCDIC
IBM
BCD
6
8 ,
Extended Binary Coded Decimal Interchange Code (EBCDIC).
digit
zone
.
.
a
1000 0001
3
1111 0011
EBCDIC.
2,
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33
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34
ASCII
ASCII
(telex)
.
ASCII
32
, 10 , 52
(
), 32
(
$
#),
space .
8-
.
(Parity)
.
on
off
ASCII A, 7
100 0001
0100 0001
ASCII C, 7
100 0011
1100 0011
.
1980
12810
25510
.
.
-
35
Unicode
EBCDIC
ASCII
.
1991,
Unicode -
Unicode Consortium.
Unicode
16-
ASCII
Latin-1
.
Unicode
16
.
Unicode
.
... Slide Number 17 Binary-Coded DecimalBinary-Coded DecimalEBCDICSlide Number 33ASCIIUnicode
