3
2.1 positional number system
(按位计数制)
A decimal number D :
1
10
p
ni
i
i
d
D
10
= d
p-1
... d
1
d
0
. d
-1
... d
-n
the radix may be any integer r≥2 ,
D
r
= d
p-1
... d
1
d
0
. d
-1
... d
-n
1p
ni
i
i
rd
If r=2, then D
2
1
2
p
ni
i
i
d
Binary number
Digits: 0, 1
Binary digits(bits)
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