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Cc php ton thao tc trn bitKeywords: Ton t thao tc b it trong
C,C++, ton t b it, php ton b it, tnh ton vi b it.
Bitwise Operations - Cc php thao tc trn bitMt php ton thao tc
trn bit thc hin cc tnh ton trn cc chui bit, hoc trn cc s nh phn. a
s cc my tnh hin gi, vic thc thi cc php ton bitwise thng nhanh hn so
vi khi thc thi cc php ton cng, tr, nhn, hoc chia (Theo li ca anh
Phm Hu Ngn - mt trong nhng ltv ni ting nht hin gi, 1 php tnh b
itwise nhanh hn khong 30 ln so vi php nhn & php chia) Do vy m
khi code vit ra c s dng nhiu php ton bitwise thay cho cc php ton
cng, tr, nhn, chia th tc thc hin s nhanh hn rt nhiu. Tuy nhin nu nh
tn dng qu nhiu bitwise th code s tr nn phc tp, kh vit. Cho nn hm
nay mnh s hng dn cc bn thc hin cc thao tc bitwise mc c bn, khi p
dng n code ca cc bn s ko qu phc tp m chng trnh li chy nhanh + tit
kim b nh hn. Cc php ton Bitwise c bn. Trong ngn ng C/C++/C# c 6 php
ton bitwise c tm tt trong bng sau : Cc php ton ny c th p dng cho cc
kiu int, char nhng ko p dng cho float. 1./ Ton t AND:(khc vi and
logic &&) - K hiu: & - Php ton ny cn hai ton hng c kiu
ging nhau. Cc ton hng dng s nguyn (thp phn) s c chuyn v dng nh phn
ri sau thc hin thao tc and tng bit vi bit. 0&0=0 0&1=0
1&0=0 1&1=1 V d: Tnh 5 & 3 5- 00 -> 11 3- 01 ->
01 ---- & ---=00 ->1 01 - Php ton & thng c dng kim tra 1
bit c th no c gi tr l bao nhiu. V d kim tra bit th nht ca bin n c
gi tr bao nhiu ta dng php ton n&1 (bit th nht l 1 -> n l s
l, bit th nht l 0 -> n l s chn) 2./ Ton t OR (khc vi or logic
||) - K hiu: | - Php ton ny cn hai ton hng c kiu ging nhau. Cc ton
hng dng s nguyn (thp phn) s c chuyn v dng nh phn ri sau thc hin
thao tc or tng bit vi bit. 0|0=0 0|1=1 1|0=1 1|1=1 V d: Tnh 5 | 3
5- 00 -> 11 3- 01 -> 01
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Onenix Archive 2012 (2) 2011 (30) 11/06 (2) 10/16 (1) Cc php ton
thao tc trn bit 10/02 (2) 09/25 (1) 09/18 (2) 08/07 (6) 07/31 (1)
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vit : http://... [ATL] Dialog modal & modaless To ng dng Dialog
s dng th vin ATL. Modal dialog Modaless dialog Tm hiu thm v th vin
ATL : Th vin ATL & MFC Tm hiu th... Cc php ton thao tc trn bit
Keyw ords: Ton t thao tc bit trong C,C++, ton t bit, php ton bit,
tnh ton vi bit. Bitw ise Operations - Cc php thao tc trn bi...
- Ton t ny thng c dng kt hp cc bit t cc bin khc nhau vo mt bin
duy nht. V d ta c hai bin l ch1 v ch2 v gi s cc bit t 0..3 ca ch1
cha cc gi tr mong mun cn cc bit 4..7 ca ch2 cha cc gi tr mong mun.
Khi vit : ac1c2tc 8btcaauc ccgtmn m. =h|h;h i ha i r og un
3./ Ton t XOR: - K hiu: ^ - Ton t xor tr v tr 1 khi ch c mt bit
ch ko phi hai bit c tr l 1 (hoc hai b it khc nhau th tr v 1, hai b
it ging nhau th tr v 0) 0^0=0 0^1=1 1^0=1 1^1=0 - Ton t xor c dng
khi cn lt bit, ngha l cn hon chuyn gia 1 v 0 (v 1^1=0 v 1^0=1) - V
d: lt bit th 3 trong bin ch ta dng c =c^v 8t p)10(h p) h h8 (hp
hn=00n hn hoc nu mun vit theo kiu thp lc phn th vit nh sau: c =c^x8
h h00
4./ Ton t dch phi: - K hiu: >> - Ton t ny lm vic trn mt
bin duy nht v dch tng bit trong ton hng sang phi. S bit dch chuyn c
ch nh trong s i theo sau ton t. Vic dch phi n bit ng ngha vi vic
chia ton hng cho 2^n. Gi tr ca bit chn vo bn tri lun lun bng 0. - V
d: 23>>1 (dch 23 sang phi 1 bit) Khi kt qu s ra bng 11
(00001101). kim tra li, ta thc hin php ton 23 chia 2^1, cng s cho
ra kt qu bng 11. 5./ Ton t dch tri: - K hiu:
