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鍠滅埍灝忕珯 2005-12-09 09:39 鍙戣〃璇勮
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re: java applection 鍥懼艦鐣岄潰搴旂敤http://m.tkk7.com/plpa/archive/2005/04/20/3376.html#3538灝忓姏鍔涘姏灝忓姏鍔涘姏Wed, 20 Apr 2005 06:52:00 GMThttp://m.tkk7.com/plpa/archive/2005/04/20/3376.html#3538
瀛楀啓閿欎簡鍚?瑕佹湁鐐逛笓涓氱簿紲炲槢~~~~

灝忓姏鍔涘姏 2005-04-20 14:52 鍙戣〃璇勮
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re: sql 鎵╁睍http://m.tkk7.com/plpa/archive/2005/04/08/2983.html#2984鍣奸噷鍟暒鐨勪笘鐣?/dc:creator>鍣奸噷鍟暒鐨勪笘鐣?/author>Fri, 08 Apr 2005 01:23:00 GMThttp://m.tkk7.com/plpa/archive/2005/04/08/2983.html#2984浣滆咃細(xì)unknown 鏇存柊鏃墮棿錛?005-03-17


Transact-SQL 璇█浣跨敤鐨勬祦紼嬫帶鍒跺懡浠や笌甯歌鐨勭▼搴忚璁¤璦綾諱技涓昏鏈変互涓嬪嚑縐嶆帶鍒跺懡浠ゃ?

4.6.1 IF鈥LSE
鍏惰娉曞涓嬶細(xì)
IF <鏉′歡琛ㄨ揪寮?gt;
<鍛戒護(hù)琛屾垨紼嬪簭鍧?gt;
[ELSE [鏉′歡琛ㄨ揪寮廬
<鍛戒護(hù)琛屾垨紼嬪簭鍧?gt;]
鍏朵腑<鏉′歡琛ㄨ揪寮?gt;鍙互鏄悇縐嶈〃杈懼紡鐨勭粍鍚堬紝浣嗚〃杈懼紡鐨勫煎繀欏繪槸閫昏緫鍊尖滅湡鈥濇垨鈥滃亣鈥濄侲LSE瀛愬彞鏄彲閫夌殑錛屾渶綆鍗曠殑IF璇彞娌℃湁ELSE瀛愬彞閮ㄥ垎銆侷F鈥LSE鐢ㄦ潵鍒ゆ柇褰撴煇涓鏉′歡鎴愮珛鏃舵墽琛屾煇孌電▼搴忥紝鏉′歡涓嶆垚绔嬫椂鎵ц鍙︿竴孌電▼搴忋傚鏋滀笉浣跨敤紼嬪簭鍧楋紝IF鎴朎LSE鍙兘鎵ц涓鏉″懡浠ゃ侷F鈥LSE鍙互榪涜宓屽銆?

渚?-9
declare@x int,@y int,@z int
select @x=1,@y=2, @z=3
if@x>@y
print'x>y' --鎵撳嵃瀛楃涓?x>y'
else if@y>@z
print'y>z'
else print'z>y'
榪愯緇撴灉濡備笅
z>y
娉ㄦ剰錛氬湪Transact-SQL涓渶澶氬彲宓屽32綰с?

4.6.2 BEGIN鈥ND
鍏惰娉曞涓嬶細(xì)
BEGIN
<鍛戒護(hù)琛屾垨紼嬪簭鍧?gt;
END
BEGIN鈥ND鐢ㄦ潵璁懼畾涓涓▼搴忓潡錛屽皢鍦˙EGIN鈥ND鍐呯殑鎵鏈夌▼搴忚涓轟竴涓崟鍏冩墽琛孊EGIN鈥ND緇忓父鍦ㄦ潯浠惰鍙ワ紝濡侷F鈥LSE涓嬌鐢ㄣ傚湪BEGIN鈥ND涓彲宓屽鍙﹀鐨凚EGIN鈥ND鏉ュ畾涔夊彟涓紼嬪簭鍧椼?

4.6.3 CASE
CASE 鍛戒護(hù)鏈変袱縐嶈鍙ユ牸寮?
CASE <榪愮畻寮?gt;
WHEN <榪愮畻寮?gt;THEN<榪愮畻寮?gt;
鈥?
WHEN<榪愮畻寮?gt;THEN<榪愮畻寮?gt;
[ELSE<榪愮畻寮?gt;]
END

CASE
WHEN <鏉′歡琛ㄨ揪寮?gt; THEN <榪愮畻寮?gt;
WHEN <鏉′歡琛ㄨ揪寮?gt; THEN <榪愮畻寮?gt;
[ELSE <榪愮畻寮?gt;]
END
CASE鍛戒護(hù)鍙互宓屽鍒癝QL鍛戒護(hù)涓?
渚?-10錛氳皟鏁村憳宸ュ伐璧勶紝宸ヤ綔綰у埆涓衡?鈥濈殑涓婅皟8%錛屽伐浣滅駭鍒負(fù)鈥?鈥濈殑涓婅皟7%錛屽伐浣滅駭鍒負(fù)鈥?鈥濈殑涓婅皟6%錛屽叾瀹冧笂璋?%銆?
use pangu
update employee
set e_wage =
case
when job_level = 鈥?鈥?then e_wage*1.08
when job_level = 鈥?鈥?then e_wage*1.07
when job_level = 鈥?鈥?then e_wage*1.06
else e_wage*1.05
end
娉ㄦ剰:鎵цCASE瀛愬彞鏃訛紝鍙繍琛岀涓涓尮閰嶇殑瀛愬悕銆?

4.6.4 WHILE鈥ONTINUE鈥REAK
鍏惰娉曞涓?
WHILE <鏉′歡琛ㄨ揪寮?gt;
BEGIN
<鍛戒護(hù)琛屾垨紼嬪簭鍧?gt;
[BREAK]
[CONTINUE]
[鍛戒護(hù)琛屾垨紼嬪簭鍧梋
END
WHILE 鍛戒護(hù)鍦ㄨ瀹氱殑鏉′歡鎴愮珛鏃朵細(xì)閲嶅鎵ц鍛戒護(hù)琛屾垨紼嬪簭鍧椼侰ONTINUE鍛戒護(hù)鍙互璁╃▼搴忚煩榪嘋ONTINUE 鍛戒護(hù)涔嬪悗鐨勮鍙ワ紝鍥炲埌WHILE 寰幆鐨勭涓琛屽懡浠ゃ侭REAK 鍛戒護(hù)鍒欒紼嬪簭瀹屽叏璺沖嚭寰幆錛岀粨鏉焀HILE 鍛戒護(hù)鐨勬墽琛屻俉HILE 璇彞涔熷彲浠ュ祵濂椼?

渚?-11:
declare @x int @y int @c int
渚?-11:
declare @x int, @y int, @c int
select @x = 1, @y=1
while @x < 3
begin
print @x --鎵撳嵃鍙橀噺x 鐨勫?
while @y < 3
begin
select @c = 100*@ x+ @y
print @c --鎵撳嵃鍙橀噺c 鐨勫?
select @y = @y + 1
end
select @x = @x + 1
select @y = 1
end
榪愯緇撴灉濡備笅
1
101
102
2
201
202

4.6.5 WAITFOR
鍏惰娉曞涓?
WAITFOR {DELAY <鈥樻椂闂粹?gt; | TIME <鈥樻椂闂粹?gt;
| ERROREXIT | PROCESSEXIT | MIRROREXIT}
WAITFOR 鍛戒護(hù)鐢ㄦ潵鏆傛椂鍋滄紼嬪簭鎵ц錛岀洿鍒版墍璁懼畾鐨勭瓑寰呮椂闂村凡榪囨垨鎵璁懼畾鐨勬椂闂村凡鍒版墠緇х畫寰涓嬫墽琛屻傚叾涓樻椂闂粹欏繀欏諱負(fù)DATETIME 綾誨瀷鐨勬暟鎹紝濡傦細(xì)鈥?1:15:27鈥欙紝
浣嗕笉鑳藉寘鎷棩鏈熷悇鍏抽敭瀛楀惈涔夊涓嬶細(xì)


DELAY 鐢ㄦ潵璁懼畾絳夊緟鐨勬椂闂存渶澶氬彲杈?4 灝忔椂錛?
TIME 鐢ㄦ潵璁懼畾絳夊緟緇撴潫鐨勬椂闂寸偣錛?
ERROREXIT 鐩村埌澶勭悊闈炴甯鎬腑鏂紱
PROCESSEXIT 鐩村埌澶勭悊姝e父鎴栭潪姝e父涓柇錛?
MIRROREXIT 鐩村埌闀滃儚璁懼澶辮觸銆?
渚?-12 絳夊緟1 灝忔椂2 鍒嗛浂3 縐掑悗鎵嶆墽琛孲ELECT 璇彞
waitfor delay 鈥?1:02:03鈥?
select * from employee

渚?-13錛氱瓑鍒版櫄涓?1 鐐歸浂8 鍒嗗悗鎵嶆墽琛孲ELECT 璇彞
waitfor time 鈥?3:08:00鈥?
select * from employee

4.6.6 GOTO
璇硶濡備笅錛?
GOTO 鏍囪瘑絎?
GOTO 鍛戒護(hù)鐢ㄦ潵鏀瑰彉紼嬪簭鎵ц鐨勬祦紼嬶紝浣跨▼搴忚煩鍒版爣鏈夋爣璇嗙鐨勬寚瀹氱殑紼嬪簭琛屽啀緇х畫寰涓嬫墽琛屻備綔涓鴻煩杞洰鏍囩殑鏍囪瘑絎﹀彲涓烘暟瀛椾笌瀛楃鐨勭粍鍚堬紝浣嗗繀欏諱互鈥滐細(xì)鈥濈粨灝撅紝濡傗?2錛氣欐垨鈥榓_1錛氣欍傚湪GOTO 鍛戒護(hù)琛岋紝鏍囪瘑絎﹀悗涓嶅繀璺熲滐細(xì)鈥濄?
渚?-14 鍒嗚鎵撳嵃瀛楃鈥?鈥欍佲?鈥欍佲?鈥欍佲?鈥欍佲?鈥?
declare @x int
select @x = 1
label_1
print @x
select @x = @x + 1
while @x < 6
goto label_1

4.6.7 RETURN
璇硶濡備笅
RETURN [鏁存暟鍊糫
RETURN 鍛戒護(hù)鐢ㄤ簬緇撴潫褰撳墠紼嬪簭鐨勬墽琛岋紝榪斿洖鍒頒笂涓涓皟鐢ㄥ畠鐨勭▼搴忔垨鍏跺畠紼嬪簭銆傚湪鎷彿鍐呭彲鎸囧畾涓涓繑鍥炲箋?
渚?-15
declare @x int @y int
select @x = 1 @y = 2
if x>y
return 1
else
return 2
濡傛灉娌℃湁鎸囧畾榪斿洖鍊鹼紝SQL Server 緋葷粺浼?xì)鏍规嵁绋嬪簭鎵ц鐨劸l撴灉榪斿洖涓涓唴瀹氬鹼紝濡?
琛?-5 鎵紺恒?


濡傛灉榪愯榪囩▼浜х敓浜嗗涓敊璇紝SQL Server緋葷粺灝嗚繑鍥炵粷瀵瑰兼渶澶х殑鏁板鹼紱濡傛灉姝ゆ椂鐢ㄦ埛姝ゆ椂瀹氫箟浜嗚繑鍥炲鹼紝鍒欎互榪斿洖鐢ㄦ埛瀹氫箟鐨勫箋俁ETURN璇彞涓嶈兘榪斿洖NULL鍊箋?






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re: 鎴戠殑java瀛︿範(fàn)絎旇錛堢涓绔?鍥為【C/C++ 鍩烘湰姒傚康錛?/title><link>http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2678</link><dc:creator>鍣奸噷鍟暒鐨勪笘鐣?/dc:creator><author>鍣奸噷鍟暒鐨勪笘鐣?/author><pubDate>Thu, 31 Mar 2005 22:53:00 GMT</pubDate><guid>http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2678</guid><description><![CDATA[const涓昏鏄負(fù)浜嗙▼搴忕殑鍋ュ.鍨?鍑忓皯紼嬪簭鍑洪敊. <br>鏈鍩烘湰鐨勭敤娉? <br>const int a=100; b鐨勫唴瀹逛笉鍙?b鍙兘鏄?00涔熷氨鏄0鏄庝竴涓猧nt綾誨瀷鐨勫父閲?#define b =100) <br>int const b=100; //鍜屼笂闈綔鐢ㄤ竴鏍? <br> <br>const鎸囬拡鍜屽紩鐢ㄤ竴鑸敤鍦ㄥ嚱鏁扮殑鍙傛暟涓?<br>int* m = &a; //鍑洪敊,甯擱噺鍙兘鐢ㄥ父鎸囬拡 <br>int c= 1;const int*pc = &c;//甯告寚閽堝彲鎸囧悜甯擱噺 <br> <br>const int* pa = &a; //鎸囬拡鎸囧悜鐨勫唴瀹逛負(fù)甯擱噺(灝辨槸b鐨勫間笉鍙? <br>int const *a = &b; //鎸囬拡鎸囧悜鐨勫唴瀹逛負(fù)甯擱噺(灝辨槸b鐨勫間笉鍙?*p=3//error <br>int* const a = &b; //鎸囬拡涓哄父閲?涓嶈兘鏇存敼鎸囬拡浜嗗 a++浣嗗彲浠ユ敼鍊?p=3; <br> <br>浠庤繖鍙互鐪嬪嚭const鏀懼湪*宸︿晶淇グ鐨勬槸鎸囬拡鐨勫唴瀹?const鏀懼湪*鍙充晶淇グ鐨勬槸鎸囬拡 <br>鏈韓. <br> <br>const寮曠敤鐨勭敤娉曞拰鎸囬拡涓鏍?<br>int const & a=b; 鍜屾寚閽堜竴鏍?<br>const int& a=b; 鍜屾寚閽堜竴鏍?<br>浣嗘病鏈?int& const a=b 鐨勭敤娉曞洜涓哄紩鐢ㄤ笉鑳藉仛縐諱綅榪愮畻錛屼絾鍙槸鍑轟釜warning <br> <br>const int* const a = &b; //緇煎悎搴旂敤,涓鑸敤鏉ヤ紶閫掑緇寸殑鏁扮粍 <br>綾誨錛歝har* init[] = {"Paris","in the","Spring"}; <br>void fun(const int* const a){} <br>fun(init)//淇濇姢鍙傛暟涓嶈淇敼 <br> <br>int A(int)const; //鏄父鍑芥暟錛屽彧鑳界敤鍦ㄧ被涓紝璋冪敤瀹冪殑瀵硅薄涓嶈兘鏀規(guī)敼鍙樻垚鍛樺?<br>const int A(); //榪斿洖鐨勬槸甯擱噺,鎵浠ュ繀欏昏繖涔堣皟鐢?cosnt int a=A(); <br>int A(const int); //鍙傛暟涓嶈兘鏀瑰?鍙敤鍦ㄤ換鎰忓嚱鏁?<br>int A(const int*); <br>.... <br>int height() const;//甯稿嚱鏁板彧鑳界敱甯稿嚱鏁拌皟鐢?<br>int max(int,int) const; <br>int Max = max(height(),height()); <br> <br>const int* pHeap = new int; <br>delete pHeap; <br>p = NULL;//鍑洪敊 <br>鎴戠殑瑙e喅鍔炴硶鏄己鍒剁被鍨嬭漿鎹?<br>const int* pHeap = new int(1); <br>delete (int*)pHeap; <br>pHeap = NULL; <br> <br>涓銆乧onst 鍜屽紩鐢ㄨ仈鍚堜嬌鐢ㄧ殑鏃跺欒娉ㄦ剰 <br> <br>const int a = 1; <br>const int& ref1 = a; <br>const int& ref2 = 1; <br> <br>ref1 鍜?ref2 閮芥槸姝g‘鐨勶紝浣嗘槸浠栦滑寮曠敤鐨勫唴瀹瑰拰涓鑸殑寮曠敤涓嶅悓 <br>瀵?const int& ref1 = a; 鑰岃█錛屽叾瀹炶繖涓?ref1 宸茬粡鍜?a 娌℃湁浠諱綍鍏崇郴浜?<br>ref1 瀹為檯涓婃槸瀵逛竴涓復(fù)鏃墮噺鐨勫紩鐢ㄣ傚悓鐞?const int& ref2 = 1; 涔熸槸瀵?<br>涓涓復(fù)鏃墮噺鍋氱殑寮曠敤銆傚綋寮曠敤涓存椂閲忔槸 C++ 鐨勯殣寮忕被鍨嬭漿鎹㈠彲浠ヨ搗浣滅敤銆?<br>涓存椂閲忕殑鐢熷瓨鏈熷拰寮曠敤閲忕殑鐢熷瓨鏈熺浉鍚屻? <br> <br>浜屻佸己浼燾onst瀵硅薄鍙兘瀵艱嚧鏃犲畾涔夎涓? <br> <br>瀵逛簬浼樺寲鍋氱殑姣旇緝濂界殑緙栬瘧鍣紝浠g爜 const int i = 1; <br>褰撳悗闈㈢敤鍒板彉閲?i 鐨勬椂鍊欙紝緙栬瘧鍣ㄤ細(xì)浼樺寲鎺夊 i 鐨勫瓨鍙栵紝鑰岀洿鎺ヤ嬌鐢ㄧ珛鍗蟲暟 1 <br> <br>const int i = 1; <br> <br>*(const_cast<int*>(&i)) = 2; <br>cout << *(int*)&i << endl; <br>cout << i << endl; <br> <br>鎵浠ワ紝瀵?const 瀵硅薄鍋?const_cast 鍙兘瀵艱嚧鏃犲畾涔夎涓?<br>鐩墠鎴戝氨閬囧埌榪欎簺闂錛岄偅浣嶈繕鏈夎ˉ鍏呯殑鍚? <br> <br> <br> <br> <br> <br>鑳戒笉鑳芥妸鑷繁鐨勭粡楠屼篃璋堣皥銆傚ぇ瀹朵氦嫻佷氦嫻?<br>榪欎釜灝辨槸鎴戝湪璋冮敊鏃跺彂鐜扮殑 <br>int height() const;//甯稿嚱鏁板彧鑳界敱甯稿嚱鏁拌皟鐢?<br>int max(int,int) const; <br>int Max = max(height(),height()); <br> <br> <br> <br> <br> <br>Thinking again in C++錛堜竴錛夊父閲忔у師鐞?cphj錛堝師浣滐級 <br>鏈変簺鍦版柟寰堝彈鍚彂 <br> <br> <br>1.涓嶈兘灝哻onst淇グ鐨勪換浣曞璞°佸紩鐢ㄥ拰鎸囬拡浣滀負(fù)璧嬪艱〃杈懼紡鐨勫乏鍊箋?<br>const int cx=100; <br>const int & rcx=cx; <br>const int * pcx=&cx; <br>cx=200; //error <br>rcx=200; //error <br>*pcx=200; //error <br> <br>2.const綾誨瀷鐨勫璞′笉鑳界洿鎺ヨnon-const綾誨瀷鐨勫埆鍚嶆墍寮曠敤銆?<br>(1)涓嶈兘灝哻onst綾誨瀷鐨勫璞′紶閫掔粰non-const綾誨瀷鐨勫紩鐢ㄣ?<br>const int cx=100; <br>int & rx=cx; //error <br>(2)涓嶈兘灝哻onst綾誨瀷鐨勫疄鍙備紶閫掔粰褰㈠弬涓簄on-const綾誨瀷寮曠敤鐨勫嚱鏁般?<br>void f(int a) <br>{ <br>} <br>void g(int & ra) <br>{ <br>} <br>const int cx=100; <br>f(cx); //ok <br>g(cx); //error <br>(3)涓嶈兘灝哻onst綾誨瀷鐨勫璞′綔涓簄on-const綾誨瀷寮曠敤鐨勫嚱鏁拌繑鍥炲箋?<br>int & f(const int & rca) <br>{ <br>return rca; //error <br>} <br>int x=100; <br>f(x); <br> <br>3.鍙互浣跨敤const綾誨瀷鍒悕寮曠敤non-const瀵硅薄銆傛鏃墮氳繃const寮曠敤涓嶈兘淇敼瀵硅薄錛屼絾瀵硅薄鍙互閫氳繃non-const寮曠敤琚慨鏀廣?<br>int x=100; <br>int & rx=x; <br>const int & rcx=x; //ok <br>x=200; <br>rx=200; <br>rcx=200; //error <br> <br>4.鎸囬拡鐨勫睘鎬ф湁涓や釜錛氭寚閽堢殑綾誨瀷鍜屾寚閽堟湰韜殑甯擱噺鎬с傚叾涓紝鎸囧悜const瀵硅薄涓庢寚鍚憂on-const瀵硅薄錛屾槸涓嶅悓鐨勬寚閽堢被鍨嬨?<br>int x=100; <br>const int * pcx=&x; //[1] <br>int * px=&x; //[2] <br>int y=100; <br>int * const cpy=&y; //[3] <br>int * py=&y; //[4] <br>[1][2]涓や釜鎸囬拡鐨勭被鍨嬩笉鍚岋紱[3][4]涓や釜鎸囬拡鐨勫父閲忔т笉鍚屻?<br>瀵硅薄涓庢寚鍚戝璞$殑鎸囬拡鐨勮鍒欑被浼間簬瀵硅薄涓庡紩鐢ㄣ傚嵆錛宑onst綾誨瀷鐨勫璞′笉鑳界洿鎺ヨnon-const綾誨瀷鐨勬寚閽堟墍鎸囩ず錛堝悓2錛夛紱鍙互浣跨敤const綾誨瀷鐨勬寚閽堟寚鍚憂on-const瀵硅薄錛堝悓3錛夈? <br> <br>5.鍙互灝嗙浉鍚岀被鍨嬶紙鍖呮嫭甯擱噺鎬э級鐨刢onst鎸囬拡鍊艱祴緇檔on-const鎸囬拡銆?<br>int x=100; <br>int * px; <br>const int * pcx=&x; <br>px=pcx; //error <br>int * const cpx=&x; <br>px=cpx; //ok <br> <br>6.鑻ュ嚱鏁扮殑榪斿洖鍊間負(fù)鍐呭緩綾誨瀷鎴栨槸鎸囬拡錛屽垯璇ヨ繑鍥炲艱嚜鍔ㄦ垚涓篶onst鎬ц川銆備絾鑷畾涔夌被鍨嬪垯涓簄on-const鎬ц川銆?<br>int f() //鐩稿綋浜庤繑鍥瀋onst int <br>{ <br>return 100; <br>} <br>int * g(int & ra) //鐩稿綋浜庤繑鍥瀒nt * const <br>{ <br>return &ra; <br>} <br>class CTest <br>{ <br>int n; <br>public: <br>CTest(int n){this->n=n;} <br>}; <br>CTest h() //榪斿洖鐨勫氨鏄疌Test <br>{ <br>return CTest(200); <br>} <br> <br>f()=200; //error <br> <br>int x=100; <br>int y=200; <br>int * px=&x; <br>g(y)=px; //error <br>*g(y)=x; //ok錛屼粠榪欑偣鍙互鐪嬪嚭g()榪斿洖鐨勪笉鏄痗onst int * <br> <br>CTest t(100); <br>h()=t; //ok錛屼絾鍗存槸瀹屽叏閿欒鐨勩佸嵄闄╃殑鍋氭硶 <br>//鎵浠()鐨勬紜啓娉曟槸榪斿洖const CTest <br> <br> <br> <br> <br> <br>const int b=100; b鐨勫唴瀹逛笉鍙?b鍙兘鏄?00 <br>int const b=100; b蹇呴』涓篿nt鍨?涓嶈兘涓哄叾浠栫被鍨? <br>榪?鍙ヨ瘽鐨勬剰鎬濆簲璇ユ槸涓鏍風(fēng)殑鍚?錛?THINKING IN C++鏄繖鏍瘋鐨?<br> <br> <br> <br> <br> <br>const int a=100; a鐨勫唴瀹逛笉鍙?a鍙兘鏄?00錛堝悓鏍蜂笉鑳界被鍨嬭漿鎹級銆?<br>int const b=100; b蹇呴』涓篿nt鍨?涓嶈兘涓哄叾浠栫被鍨?錛堝悓鏍峰湪浣跨敤涓笉鑳戒慨鏀癸級銆?<br>鎵浠鍜宐鏄竴鏍風(fēng)殑錛岀О涓烘暣鍨嬪父鏁幫紝鍦ㄤ嬌鐢ㄤ腑涓嶈兘琚慨鏀癸紝褰撶劧閮戒笉鑳借漿涓哄叾浠栫被鍨嬩簡銆? <br>#include <iostream> <br> <br>using namespace std; <br> <br>int main() <br>{ <br>銆銆const int a = 100; <br>銆銆int const b = 100; <br> <br>銆 a = 100; //榪欏洓鏉¤鍙ョ紪璇戞椂閮戒細(xì)鍑虹幇鈥淐annot modify a const object <br>b = 100; //in function main()鈥濈殑閿欒鎻愮ず錛屼篃灝辨槸璇達(dá)紝浠諱綍浼佸浘淇敼銆銆 a = 100.0;銆//a鍜宐錛堝叾瀹炴槸涓鏍風(fēng)殑錛夌殑琛屼負(fù)閮戒細(xì)鍑虹幇鈥滅伨闅鋸濓紝鍦ㄨ娉曚笂璁插氨銆銆b = 100.0; //鏄痑鍜宐閮戒笉鑳藉嚭鐜板湪璧嬪艱鍙ョ殑宸﹁竟錛? <br> <br>銆銆cout<<'\n'<<a<<'\n'<<b<<endl; <br> <br>銆銆return 0; <br>} <br> <br> <br> <br> <br> <br>甯稿嚱鏁扮殑璋冪敤鏄繖鏍風(fēng)殑錛氬父閲忓璞″彧鑳借皟鐢ㄥ父鎴愬憳鍑芥暟錛岄潪甯擱噺瀵硅薄鍗沖彲浠ヨ皟甯告垚鍛樺嚱鏁幫紝涔熷彲浠ヨ皟涓鑸垚鍛樺嚱鏁幫紝浣嗗綋鏌愪釜鍑芥暟鏈塩onst鍜岄潪const涓や釜鐗堟湰鏃訛紝const瀵硅薄璋僣onst鐗堟湰錛岄潪const瀵硅薄璋冮潪const鐗堟湰 <br>渚嬶細(xì) <br>class A <br>{ <br>public: <br>int & GetData(){return data;} <br>const int & GetData()const {return data;} <br>private: <br>int data; <br>} <br>A a; <br>a.GetData();//璋冪敤int & GetData(){return data;} <br>//浣嗗鏋滄病鏈夎繖涓嚱鏁幫紝涔熷彲浠ヨ皟鐢╟onst int & GetData()const <br>const A const_a; <br>const_a.GetData();//璋冪敤const int & GetData()const {return data;} <br>甯稿嚱鏁板彧鑳借皟甯稿嚱鏁幫紝涔熸槸鐢變簬榪欎釜鍘熷洜 <br> <br> <br> <br> <br> <br>綆椾綘鐙狅紒鍔犱袱鐐?<br> <br>涓銆乧onst 鍜屽紩鐢ㄨ仈鍚堜嬌鐢ㄧ殑鏃跺欒娉ㄦ剰 <br> <br>const int a = 1; <br>const int& ref1 = a; <br>const int& ref2 = 1; <br> <br>ref1 鍜?ref2 閮芥槸姝g‘鐨勶紝浣嗘槸浠栦滑寮曠敤鐨勫唴瀹瑰拰涓鑸殑寮曠敤涓嶅悓 <br>瀵?const int& ref1 = a; 鑰岃█錛屽叾瀹炶繖涓?ref1 宸茬粡鍜?a 娌℃湁浠諱綍鍏崇郴浜?<br>ref1 瀹為檯涓婃槸瀵逛竴涓復(fù)鏃墮噺鐨勫紩鐢ㄣ傚悓鐞?const int& ref2 = 1; 涔熸槸瀵?<br>涓涓復(fù)鏃墮噺鍋氱殑寮曠敤銆傚綋寮曠敤涓存椂閲忔槸 C++ 鐨勯殣寮忕被鍨嬭漿鎹㈠彲浠ヨ搗浣滅敤銆?<br>涓存椂閲忕殑鐢熷瓨鏈熷拰寮曠敤閲忕殑鐢熷瓨鏈熺浉鍚屻? <br> <br>浜屻佸己浼燾onst瀵硅薄鍙兘瀵艱嚧鏃犲畾涔夎涓? <br> <br>瀵逛簬浼樺寲鍋氱殑姣旇緝濂界殑緙栬瘧鍣紝浠g爜 const int i = 1; <br>褰撳悗闈㈢敤鍒板彉閲?i 鐨勬椂鍊欙紝緙栬瘧鍣ㄤ細(xì)浼樺寲鎺夊 i 鐨勫瓨鍙栵紝鑰岀洿鎺ヤ嬌鐢ㄧ珛鍗蟲暟 1 <br> <br>const int i = 1; <br> <br>*(const_cast<int*>(&i)) = 2; <br>cout << *(int*)&i << endl; <br>cout << i << endl; <br> <br>鎵浠ワ紝瀵?const 瀵硅薄鍋?const_cast 鍙兘瀵艱嚧鏃犲畾涔夎涓?<br> <br> <br> <br> <br> <br>#include <iostream.h> <br>void fun(char b){cout <<"void"<<endl;} <br>int fun(int const b){cout <<"int"<<endl;} <br>int main() <br>{ <br>fun(1.0);//璇︾粏鐪嬬湅閲嶈澆鍑芥暟鍚? <br>fun(4); //鎯充竴鎯寵皟鐢ㄥ摢涓涓? <br> <br>return 0; <br>} <br>鎴戣瘯浜嗕竴涓嬶紝浼?xì)鍑洪? vc璇達(dá)細(xì)'fun':ambiguous call to overloaded function <br> <br> <br> <br> <br> <br>琛ュ厖鐨勫ソ鍟婏紝榪欎釜涓鑸笉浼?xì)娉ㄦ剰鐨?<br>const int i = 1; <br>*(const_cast<int*>(&i)) = 2; <br>cout << *(int*)&i << endl; <br>cout << i << endl; <br>榪欎釜鍙湡鏈夋剰鎬濓紝璋冭瘯鏃朵袱涓兘鏄?錛屽彲緙栬瘧灝辨槸2錛?浜?<br>const鐨勬案榪滈兘鏄痗onst,榪欐牱鑳芥洿鏀瑰氨涓嶉敊浜嗭紝涓嶇劧灝辮嚜鐩哥煕鐩句簡 <br>濂囨殑鏄?pi 鍜?&i鍦板潃涓鏍峰晩錛屽氨鍍忔ゼ涓婅鐨勮繖鏄紪璇戞椂鐨勪紭鍖?<br>澶勭悊 <br>const int i = 1; <br>int* pi=const_cast<int*>(&i); <br>*pi=2; <br>cout << *pi << endl; <br>cout << i << endl; <br> <br> <br> <br> <br> <br>閭d釜涓昏鏄殣寮忚漿鎹?<br>浣犲彲渚濇鎶婁袱涓嚱鏁版敞鎺夌湅鐪嬭皟鐢?<br>#include <iostream.h> <br>//void fun(char b){cout <<"void"<<endl;} <br>void fun(int b){cout <<"int"<<endl;} <br>int main() <br>{ <br>fun('a'); <br>fun(4); <br>return 0; <br>} <br> <br> <br><img src ="http://m.tkk7.com/plpa/aggbug/2678.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.tkk7.com/plpa/" target="_blank">鍣奸噷鍟暒鐨勪笘鐣?/a> 2005-04-01 06:53 <a href="http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2678#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>re: 鎴戠殑java瀛︿範(fàn)絎旇錛堢涓绔?鍥為【C/C++ 鍩烘湰姒傚康錛?/title><link>http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2677</link><dc:creator>鍣奸噷鍟暒鐨勪笘鐣?/dc:creator><author>鍣奸噷鍟暒鐨勪笘鐣?/author><pubDate>Thu, 31 Mar 2005 22:52:00 GMT</pubDate><guid>http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2677</guid><description><![CDATA[甯擱噺瀹氫箟瑙勫垯 <br>銆愯鍒?-3-1銆戦渶瑕佸澶栧叕寮鐨勫父閲忔斁鍦ㄥご鏂囦歡涓紝涓嶉渶瑕佸澶栧叕寮鐨勫父閲忔斁鍦ㄥ畾涔夋枃浠剁殑澶撮儴銆備負(fù)渚夸簬綆$悊錛屽彲浠ユ妸涓嶅悓妯″潡鐨勫父閲忛泦涓瓨鏀懼湪涓涓叕鍏辯殑澶存枃浠朵腑銆?<br>銆愯鍒?-3-2銆戝鏋滄煇涓甯擱噺涓庡叾瀹冨父閲忓瘑鍒囩浉鍏籌紝搴斿湪瀹氫箟涓寘鍚繖縐嶅叧緋伙紝鑰屼笉搴旂粰鍑轟竴浜涘绔嬬殑鍊箋?<br>渚嬪錛?<br>const float RADIUS = 100; <br>const float DIAMETER = RADIUS * 2; <br>綾諱腑鐨勫父閲?<br>鏈夋椂鎴戜滑甯屾湜鏌愪簺甯擱噺鍙湪綾諱腑鏈夋晥銆傜敱浜?define瀹氫箟鐨勫畯甯擱噺鏄叏灞鐨勶紝涓嶈兘杈懼埌鐩殑錛屼簬鏄兂褰撶劧鍦拌寰楀簲璇ョ敤const淇グ鏁版嵁鎴愬憳鏉ュ疄鐜般俢onst鏁版嵁鎴愬憳鐨勭‘鏄瓨鍦ㄧ殑錛屼絾鍏跺惈涔夊嵈涓嶆槸鎴戜滑鎵鏈熸湜鐨勩俢onst鏁版嵁鎴愬憳鍙湪鏌愪釜瀵硅薄鐢熷瓨鏈熷唴鏄父閲忥紝鑰屽浜庢暣涓被鑰岃█鍗存槸鍙彉鐨勶紝鍥犱負(fù)綾誨彲浠ュ垱寤哄涓璞★紝涓嶅悓鐨勫璞″叾const鏁版嵁鎴愬憳鐨勫煎彲浠ヤ笉鍚屻?<br> 涓嶈兘鍦ㄧ被澹版槑涓垵濮嬪寲const鏁版嵁鎴愬憳銆備互涓嬬敤娉曟槸閿欒鐨勶紝鍥犱負(fù)綾葷殑瀵硅薄鏈鍒涘緩鏃訛紝緙栬瘧鍣ㄤ笉鐭ラ亾SIZE鐨勫兼槸浠涔堛?<br> class A <br> {鈥?<br> const int SIZE = 100; // 閿欒錛屼紒鍥懼湪綾誨0鏄庝腑鍒濆鍖朿onst鏁版嵁鎴愬憳 <br> int array[SIZE]; // 閿欒錛屾湭鐭ョ殑SIZE <br> }; <br> <br>const鏁版嵁鎴愬憳鐨勫垵濮嬪寲鍙兘鍦ㄧ被鏋勯犲嚱鏁扮殑鍒濆鍖栬〃涓繘琛岋紝渚嬪 <br> class A <br> {鈥?<br> A(int size); // 鏋勯犲嚱鏁?<br> const int SIZE ; <br> }; <br> A::A(int size) : SIZE(size) // 鏋勯犲嚱鏁扮殑鍒濆鍖栬〃 <br> { <br> 鈥?<br> } <br> A a(100); // 瀵硅薄 a 鐨凷IZE鍊間負(fù)100 <br> A b(200); // 瀵硅薄 b 鐨凷IZE鍊間負(fù)200 <br> <br> 鎬庢牱鎵嶈兘寤虹珛鍦ㄦ暣涓被涓兘鎭掑畾鐨勫父閲忓憿錛熷埆鎸囨湜const鏁版嵁鎴愬憳浜嗭紝搴旇鐢ㄧ被涓殑鏋氫婦甯擱噺鏉ュ疄鐜般備緥濡?<br> class A <br> {鈥?<br> enum { SIZE1 = 100, SIZE2 = 200}; // 鏋氫婦甯擱噺 <br> int array1[SIZE1]; <br> int array2[SIZE2]; <br> }; <br> 鏋氫婦甯擱噺涓嶄細(xì)鍗犵敤瀵硅薄鐨勫瓨鍌ㄧ┖闂達(dá)紝瀹冧滑鍦ㄧ紪璇戞椂琚叏閮ㄦ眰鍊箋傛灇涓懼父閲忕殑緙虹偣鏄細(xì)瀹冪殑闅愬惈鏁版嵁綾誨瀷鏄暣鏁幫紝鍏舵渶澶у兼湁闄愶紝涓斾笉鑳借〃紺烘誕鐐規(guī)暟錛堝PI=3.14159錛夈?<br> <br><img src ="http://m.tkk7.com/plpa/aggbug/2677.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.tkk7.com/plpa/" target="_blank">鍣奸噷鍟暒鐨勪笘鐣?/a> 2005-04-01 06:52 <a href="http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2677#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>re: 鎴戠殑java瀛︿範(fàn)絎旇錛堢涓绔?鍥為【C/C++ 鍩烘湰姒傚康錛?/title><link>http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2676</link><dc:creator>鍣奸噷鍟暒鐨勪笘鐣?/dc:creator><author>鍣奸噷鍟暒鐨勪笘鐣?/author><pubDate>Thu, 31 Mar 2005 22:50:00 GMT</pubDate><guid>http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2676</guid><description><![CDATA[ <br>甯擱噺 <br> 甯擱噺鏄竴縐嶆爣璇嗙錛屽畠鐨勫煎湪榪愯鏈熼棿鎭掑畾涓嶅彉銆侰璇█鐢?#define鏉ュ畾涔夊父閲忥紙縐頒負(fù)瀹忓父閲忥級銆侰++ 璇█闄や簡 #define澶栬繕鍙互鐢╟onst鏉ュ畾涔夊父閲忥紙縐頒負(fù)const甯擱噺錛夈?<br>涓轟粈涔堥渶瑕佸父閲? <br>濡傛灉涓嶄嬌鐢ㄥ父閲忥紝鐩存帴鍦ㄧ▼搴忎腑濉啓鏁板瓧鎴栧瓧絎︿覆錛屽皢浼?xì)鏈変粈涔堥夯鐑?chǔ)锛?<br>錛?錛?紼嬪簭鐨勫彲璇繪э紙鍙悊瑙fэ級鍙樺樊銆傜▼搴忓憳鑷繁浼?xì)蹇樿閭d簺鏁板瓧鎴栧瓧绗︿覆鏄粈涔堟剰鎬濓紝鐢ㄦ埛鍒欐洿鍔犱笉鐭ュ畠浠粠浣曞鏉ャ佽〃紺轟粈涔堛?<br>錛?錛?鍦ㄧ▼搴忕殑寰堝鍦版柟杈撳叆鍚屾牱鐨勬暟瀛楁垨瀛楃涓詫紝闅句繚涓嶅彂鐢熶功鍐欓敊璇?<br>錛?錛?濡傛灉瑕佷慨鏀規(guī)暟瀛楁垨瀛楃涓詫紝鍒欎細(xì)鍦ㄥ緢澶氬湴鏂規(guī)敼鍔紝鏃㈤夯鐑?chǔ)鍙堝?guī)槗鍑洪敊銆?<br> <br>銆愯鍒?-1-1銆?灝介噺浣跨敤鍚箟鐩磋鐨勫父閲忔潵琛ㄧず閭d簺灝嗗湪紼嬪簭涓嬈″嚭鐜扮殑鏁板瓧鎴栧瓧絎︿覆銆?<br>渚嬪錛?<br> #define MAX 100 /* C璇█鐨勫畯甯擱噺 */ <br>const int MAX = 100; // C++ 璇█鐨刢onst甯擱噺 <br>const float PI = 3.14159; // C++ 璇█鐨刢onst甯擱噺 <br> const 涓?#define鐨勬瘮杈?<br> C++ 璇█鍙互鐢╟onst鏉ュ畾涔夊父閲忥紝涔熷彲浠ョ敤 #define鏉ュ畾涔夊父閲忋備絾鏄墠鑰呮瘮鍚庤呮湁鏇村鐨勪紭鐐癸細(xì) <br>錛?錛?const甯擱噺鏈夋暟鎹被鍨嬶紝鑰屽畯甯擱噺娌℃湁鏁版嵁綾誨瀷銆傜紪璇戝櫒鍙互瀵瑰墠鑰呰繘琛岀被鍨嬪畨鍏ㄦ鏌ャ傝屽鍚庤呭彧榪涜瀛楃鏇挎崲錛屾病鏈夌被鍨嬪畨鍏ㄦ鏌ワ紝騫朵笖鍦ㄥ瓧絎︽浛鎹㈠彲鑳戒細(xì)浜х敓鎰忔枡涓嶅埌鐨勯敊璇紙杈歸檯鏁堝簲錛夈?<br>錛?錛?鏈変簺闆嗘垚鍖栫殑璋冭瘯宸ュ叿鍙互瀵筩onst甯擱噺榪涜璋冭瘯錛屼絾鏄笉鑳藉瀹忓父閲忚繘琛岃皟璇曘?<br> <br>銆愯鍒?-2-1銆戝湪C++ 紼嬪簭涓彧浣跨敤const甯擱噺鑰屼笉浣跨敤瀹忓父閲忥紝鍗砪onst甯擱噺瀹屽叏鍙栦唬瀹忓父閲忋?<br> <br> <br> <br><img src ="http://m.tkk7.com/plpa/aggbug/2676.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.tkk7.com/plpa/" target="_blank">鍣奸噷鍟暒鐨勪笘鐣?/a> 2005-04-01 06:50 <a href="http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2676#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>re: 鎴戠殑java瀛︿範(fàn)絎旇錛堢涓绔?鍥為【C/C++ 鍩烘湰姒傚康錛?/title><link>http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2675</link><dc:creator>鍣奸噷鍟暒鐨勪笘鐣?/dc:creator><author>鍣奸噷鍟暒鐨勪笘鐣?/author><pubDate>Thu, 31 Mar 2005 22:49:00 GMT</pubDate><guid>http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2675</guid><description><![CDATA[涓銆乼ypedef鐨勭敤娉?<br> <br>____鍦–/C++璇█涓紝typedef甯哥敤鏉ュ畾涔変竴涓爣璇嗙鍙?qiáng)鍏抽敭瀛楃殑鍒悕锛屽畠鏄瑷緙栬瘧榪囩▼鐨勪竴閮ㄥ垎錛屼絾瀹冨茍涓嶅疄闄呭垎閰嶅唴瀛樼┖闂達(dá)紝瀹炰緥鍍忥細(xì) <br> <br>typedef int INT; <br>typedef int ARRAY[10]; <br>typedef (int*) pINT; <br> <br>____typedef鍙互澧炲己紼嬪簭鐨勫彲璇繪э紝浠ュ強(qiáng)鏍囪瘑絎︾殑鐏墊椿鎬э紝浣嗗畠涔熸湁鈥滈潪鐩磋鎬р濈瓑緙虹偣銆?<br> <br>浜屻?define鐨勭敤娉?<br> <br>____#define涓轟竴瀹忓畾涔夎鍙ワ紝閫氬父鐢ㄥ畠鏉ュ畾涔夊父閲?鍖呮嫭鏃犲弬閲忎笌甯﹀弬閲?錛屼互鍙?qiáng)鐢ㄦ潵瀹炵幇閭d簺鈥滆〃闈技鍜屽杽銆佽儗鍚庝竴闀夸覆鈥濈殑瀹忥紝瀹冩湰韜茍涓嶅湪緙栬瘧榪囩▼涓繘琛岋紝鑰屾槸鍦ㄨ繖涔嬪墠(棰勫鐞嗚繃紼?灝卞凡緇忓畬鎴愪簡錛屼絾涔熷洜姝ら毦浠ュ彂鐜版綔鍦ㄧ殑閿欒鍙?qiáng)鍏跺畠浠g爜缁存姢闂锛屽畠鐨勫疄渚嬪儚锛?xì) <br> <br>#define INT int <br>#define TRUE 1 <br>#define Add(a,b) ((a)+(b)); <br>#define Loop_10 for (int i=0; i<10; i++) <br> <br>____鍦⊿cott Meyer鐨凟ffective C++涓涔︾殑鏉℃1涓湁鍏充簬#define璇彞寮婄鐨勫垎鏋愶紝浠ュ強(qiáng)濂界殑鏇夸唬鏂規(guī)硶錛屽ぇ瀹跺彲鍙傜湅銆?<br> <br>涓夈乼ypedef涓?define鐨勫尯鍒?<br> <br>____浠庝互涓婄殑姒傚康渚夸篃鑳藉熀鏈竻妤氾紝typedef鍙槸涓轟簡澧炲姞鍙鎬ц屼負(fù)鏍囪瘑絎﹀彟璧風(fēng)殑鏂板悕縐?浠呬粎鍙槸涓埆鍚?錛岃?define鍘熸湰鍦–涓槸涓轟簡瀹氫箟甯擱噺錛屽埌浜咰++錛宑onst銆乪num銆乮nline鐨勫嚭鐜頒嬌瀹冧篃娓愭笎鎴愪負(fù)浜嗚搗鍒悕鐨勫伐鍏楓傛湁鏃跺緢瀹規(guī)槗鎼炰笉娓呮涓巘ypedef涓よ呭埌搴曡鐢ㄥ摢涓ソ錛屽#define INT int榪欐牱鐨勮鍙ワ紝鐢╰ypedef涓鏍峰彲浠ュ畬鎴愶紝鐢ㄥ摢涓ソ鍛紵鎴戜富寮犵敤typedef錛屽洜涓哄湪鏃╂湡鐨勮澶欳緙栬瘧鍣ㄤ腑榪欐潯璇彞鏄潪娉曠殑錛屽彧鏄幇浠婄殑緙栬瘧鍣ㄥ張鍋氫簡鎵╁厖銆備負(fù)浜嗗敖鍙兘鍦板吋瀹癸紝涓鑸兘閬靛驚#define瀹氫箟鈥滃彲璇燴濈殑甯擱噺浠ュ強(qiáng)涓浜涘畯璇彞鐨勪換鍔★紝鑰宼ypedef鍒欏父鐢ㄦ潵瀹氫箟鍏抽敭瀛椼佸啑闀跨殑綾誨瀷鐨勫埆鍚嶃?<br> <br>____瀹忓畾涔夊彧鏄畝鍗曠殑瀛楃涓蹭唬鎹?鍘熷湴鎵╁睍)錛岃宼ypedef鍒欎笉鏄師鍦版墿灞曪紝瀹冪殑鏂板悕瀛楀叿鏈変竴瀹氱殑灝佽鎬э紝浠ヨ嚧浜庢柊鍛藉悕鐨勬爣璇嗙鍏鋒湁鏇存槗瀹氫箟鍙橀噺鐨勫姛鑳姐傝鐪嬩笂闈㈢涓澶х偣浠g爜鐨勭涓夎錛?<br> <br>typedef (int*) pINT; <br>浠ュ強(qiáng)涓嬮潰榪欒: <br>#define pINT2 int* <br> <br>____鏁堟灉鐩稿悓錛熷疄鍒欎笉鍚岋紒瀹炶返涓宸埆錛歱INT a,b;鐨勬晥鏋滃悓int *a; int *b;琛ㄧず瀹氫箟浜嗕袱涓暣鍨嬫寚閽堝彉閲忋傝宲INT2 a,b;鐨勬晥鏋滃悓int *a, b;琛ㄧず瀹氫箟浜嗕竴涓暣鍨嬫寚閽堝彉閲廰鍜屾暣鍨嬪彉閲廱銆?<br> <br>____娉ㄦ剰錛氫袱鑰呰繕鏈変竴涓灝?鍙風(fēng)殑鍖哄埆鍝︼紒 <br><img src ="http://m.tkk7.com/plpa/aggbug/2675.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.tkk7.com/plpa/" target="_blank">鍣奸噷鍟暒鐨勪笘鐣?/a> 2005-04-01 06:49 <a href="http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2675#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>re: 鎴戠殑java瀛︿範(fàn)絎旇錛堢涓绔?鍥為【C/C++ 鍩烘湰姒傚康錛?/title><link>http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2674</link><dc:creator>鍣奸噷鍟暒鐨勪笘鐣?/dc:creator><author>鍣奸噷鍟暒鐨勪笘鐣?/author><pubDate>Thu, 31 Mar 2005 22:45:00 GMT</pubDate><guid>http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2674</guid><description><![CDATA[闂錛歝onst鍙橀噺 & 甯擱噺 <br> <br>銆銆涓轟粈涔堟垜璞′笅闈㈢殑渚嬪瓙涓鏍風(fēng)敤涓涓猚onst鍙橀噺鏉ュ垵濮嬪寲鏁扮粍錛孉NSI C鐨勭紪璇戝櫒浼?xì)鎶ュ憡涓涓敊璇憿錛?<br> <br>銆銆const int n = 5; <br> <br>銆銆int a[n]; <br> <br>銆銆絳旀涓庡垎鏋? <br> <br>銆銆1)銆佽繖涓棶棰樿璁虹殑鏄滃父閲忊濅笌鈥滃彧璇誨彉閲忊濈殑鍖哄埆銆傚父閲忚偗瀹氭槸鍙鐨勶紝渚嬪5錛?鈥渁bc鈥濓紝絳夛紝鑲畾鏄彧璇葷殑錛屽洜涓虹▼搴忎腑鏍規(guī)湰娌℃湁鍦版柟瀛樻斁瀹冪殑鍊鹼紝褰撶劧涔熷氨涓嶈兘澶熷幓淇敼瀹冦傝屸滃彧璇誨彉閲忊濆垯鏄湪鍐呭瓨涓紑杈熶竴涓湴鏂規(guī)潵瀛樻斁瀹冪殑鍊鹼紝鍙笉榪囪繖涓肩敱緙栬瘧鍣ㄩ檺瀹氫笉鍏佽琚慨鏀廣侰璇█鍏抽敭瀛梒onst灝辨槸鐢ㄦ潵闄愬畾涓涓彉閲忎笉鍏佽琚敼鍙樼殑淇グ絎?Qualifier)銆備笂榪頒唬鐮佷腑鍙橀噺n琚慨楗頒負(fù)鍙鍙橀噺錛屽彲鎯滃啀鎬庝箞淇グ涔熶笉鏄父閲忋傝孉NSI C瑙勫畾鏁扮粍瀹氫箟鏃剁淮搴﹀繀欏繪槸鈥滃父閲忊濓紝鈥滃彧璇誨彉閲忊濅篃鏄笉鍙互鐨勩?<br> <br>銆銆2)銆佹敞鎰忥細(xì)鍦ˋNSI C涓紝榪欑鍐欐硶鏄敊璇殑錛屽洜涓烘暟緇勭殑澶у皬搴旇鏄釜甯擱噺錛岃宑onst int n,n鍙槸涓涓彉閲?甯擱噺 != 涓嶅彲鍙樼殑鍙橀噺錛屼絾鍦ㄦ爣鍑咰++涓紝榪欐牱瀹氫箟鐨勬槸涓涓父閲忥紝榪欑鍐欐硶鏄鐨?錛屽疄闄呬笂錛屾牴鎹紪璇戣繃紼嬪強(qiáng)鍐呭瓨鍒嗛厤鏉ョ湅錛岃繖縐嶇敤娉曟湰鏉ュ氨搴旇鏄悎鐞嗙殑錛屽彧鏄疉NSI C瀵規(guī)暟緇勭殑瑙勫畾闄愬埗浜嗗畠銆?<br> <br>銆銆3)銆侀偅涔堬紝鍦ˋNSI C 璇█涓敤浠涔堟潵瀹氫箟甯擱噺鍛紵絳旀鏄痚num綾誨瀷鍜?define瀹忥紝榪欎袱涓兘鍙互鐢ㄦ潵瀹氫箟甯擱噺銆? <br> <br>銆銆闂錛歝onst鍙橀噺 & const 闄愬畾鐨勫唴瀹?<br> <br>銆銆涓嬮潰鐨勪唬鐮佺紪璇戝櫒浼?xì)鎶ヤ竴涓敊璇紝璇烽棶錛屽摢涓涓鍙ユ槸閿欒鐨勫憿錛?<br> <br>銆銆typedef char * pStr; <br> <br>銆銆char string[4] = "abc"; <br> <br>銆銆const char *p1 = string; <br> <br>銆銆const pStr p2 = string; <br> <br>銆銆p1++; <br> <br>銆銆p2++; <br> <br>銆銆絳旀涓庡垎鏋愶細(xì) <br> <br>銆銆闂鍑哄湪p2++涓娿?<br> <br>銆銆1)銆乧onst浣跨敤鐨勫熀鏈艦寮忥細(xì) const char m; <br> <br>銆銆闄愬畾m涓嶅彲鍙樸?<br> <br>銆銆2)銆佹浛鎹?寮忎腑鐨刴, const char *pm; <br> <br>銆銆闄愬畾*pm涓嶅彲鍙橈紝褰撶劧pm鏄彲鍙樼殑錛屽洜姝ら棶棰樹腑p1++鏄鐨勩?<br> <br>銆銆3)銆佹浛鎹?寮廲har, const newType m; <br> <br>銆銆闄愬畾m涓嶅彲鍙橈紝闂涓殑charptr灝辨槸涓縐嶆柊綾誨瀷錛屽洜姝ら棶棰樹腑p2涓嶅彲鍙橈紝p2++鏄敊璇殑銆?<br> <br>銆銆闂錛歝onst鍙橀噺 & 瀛楃涓插父閲?<br> <br>銆銆璇烽棶涓嬮潰鐨勪唬鐮佹湁浠涔堥棶棰橈紵 <br> <br>銆銆char *p = "i'm hungry!"; <br> <br>銆銆p[0]= 'I'; <br> <br>銆銆絳旀涓庡垎鏋愶細(xì) <br> <br>銆銆涓婇潰鐨勪唬鐮佸彲鑳戒細(xì)閫犳垚鍐呭瓨鐨勯潪娉曞啓鎿嶄綔銆傚垎鏋愬涓嬶紝 鈥渋'm hungry鈥濆疄璐ㄤ笂鏄瓧絎︿覆甯擱噺錛岃屽父閲忓線寰琚紪璇戝櫒鏀懼湪鍙鐨勫唴瀛樺尯錛屼笉鍙啓銆俻鍒濆鎸囧悜榪欎釜鍙鐨勫唴瀛樺尯錛岃宲[0] = 'I'鍒欎紒鍥懼幓鍐欒繖涓湴鏂癸紝緙栬瘧鍣ㄥ綋鐒朵笉浼?xì)绛斿簲銆?<br> <br>銆銆闂錛歝onst鍙橀噺 & 瀛楃涓插父閲? <br> <br>銆銆璇烽棶char a[3] = "abc" 鍚堟硶鍚楋紵浣跨敤瀹冩湁浠涔堥殣鎮(zhèn)o紵 <br> <br>銆銆絳旀涓庡垎鏋愶細(xì) <br> <br>銆銆鍦ㄦ爣鍑咰涓繖鏄悎娉曠殑錛屼絾鏄畠鐨勭敓瀛樼幆澧冮潪甯哥嫮灝忥紱瀹冨畾涔変竴涓ぇ灝忎負(fù)3鐨勬暟緇勶紝鍒濆鍖栦負(fù)鈥渁bc鈥濓紝錛屾敞鎰忥紝瀹冩病鏈夐氬父鐨勫瓧絎︿覆緇堟絎?\0'錛屽洜姝よ繖涓暟緇勫彧鏄湅璧鋒潵鍍廋璇█涓殑瀛楃涓詫紝瀹炶川涓婂嵈涓嶆槸錛屽洜姝ゆ墍鏈夊瀛楃涓茶繘琛屽鐞嗙殑鍑芥暟錛屾瘮濡俿trcpy銆乸rintf絳夛紝閮戒笉鑳藉琚嬌鐢ㄥ湪榪欎釜鍋囧瓧絎︿覆涓娿?<br> <br>銆銆闂錛歝onst & 鎸囬拡 <br> <br>銆銆綾誨瀷澹版槑涓璫onst鐢ㄦ潵淇グ涓涓父閲忥紝鏈夊涓嬩袱縐嶅啓娉曪紝閭d箞錛岃闂紝涓嬮潰鍒嗗埆鐢╟onst闄愬畾涓嶅彲鍙樼殑鍐呭鏄粈涔? <br> <br>銆銆1)銆乧onst鍦ㄥ墠闈?<br> <br>銆銆const int nValue錛?//nValue鏄痗onst <br> <br>銆銆const char *pContent; //*pContent鏄痗onst, pContent鍙彉 <br> <br>銆銆const (char *) pContent;//pContent鏄痗onst,*pContent鍙彉 <br> <br>銆銆char* const pContent; //pContent鏄痗onst,*pContent鍙彉 <br> <br>銆銆const char* const pContent; //pContent鍜?pContent閮芥槸const <br> <br>銆銆2)銆乧onst鍦ㄥ悗闈紝涓庝笂闈㈢殑澹版槑瀵圭瓑 <br> <br>銆銆int const nValue錛?// nValue鏄痗onst <br> <br>銆銆char const * pContent;// *pContent鏄痗onst, pContent鍙彉 <br> <br>銆銆(char *) const pContent;//pContent鏄痗onst,*pContent鍙彉 <br> <br>銆銆char* const pContent;// pContent鏄痗onst,*pContent鍙彉 <br> <br>銆銆char const* const pContent;// pContent鍜?pContent閮芥槸const <br> <br>銆銆絳旀涓庡垎鏋愶細(xì) <br> <br>銆銆const鍜屾寚閽堜竴璧蜂嬌鐢ㄦ槸C璇█涓竴涓緢甯歌鐨勫洶鎯戜箣澶勶紝鍦ㄥ疄闄呭紑鍙戜腑錛岀壒鍒槸鍦ㄧ湅鍒漢浠g爜鐨勬椂鍊欙紝甯稿父浼?xì)鍥犱给櫩欐牤個(gè)屼笉濂藉垽鏂綔鑰呯殑鎰忓浘錛屼笅闈㈣涓涓嬫垜鐨勫垽鏂師鍒欙細(xì) <br> <br>銆銆娌跨潃*鍙峰垝涓鏉$嚎錛宑onst鍜岃皝鍦ㄤ竴杈癸紝閭d箞璋佸氨鏄痗onst錛屽嵆const闄愬畾鐨勫厓绱犲氨鏄畠銆備綘鍙互鏍規(guī)嵁榪欎釜瑙勫垯鏉ョ湅涓婇潰澹版槑鐨勫疄闄呮剰涔夛紝鐩鎬俊瀹氫細(xì)涓鐩簡鐒躲?<br> <br>銆銆鍙﹀錛岄渶瑕佹敞鎰忥細(xì)瀵逛簬const (char *) ; 鍥犱負(fù)char *鏄竴涓暣浣擄紝鐩稿綋浜庝竴涓被鍨?濡?char)錛屽洜姝わ紝榪欐槸闄愬畾鎸囬拡鏄痗onst銆? <br> <br><img src ="http://m.tkk7.com/plpa/aggbug/2674.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.tkk7.com/plpa/" target="_blank">鍣奸噷鍟暒鐨勪笘鐣?/a> 2005-04-01 06:45 <a href="http://m.tkk7.com/plpa/archive/2005/04/01/2673.html#2674#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item></channel></rss> <footer> <div class="friendship-link"> <p>感谢您访问我们的网站,您可能还对以下资源感兴趣:</p> <a href="http://m.tkk7.com/" title="亚洲av成人片在线观看">亚洲av成人片在线观看</a> <div class="friend-links"> </div> </div> </footer> 主站蜘蛛池模板: <a href="http://www-777768.com" target="_blank">免费观看午夜在线欧差毛片</a>| <a href="http://quxx10.com" target="_blank">午夜免费啪视频在线观看</a>| <a href="http://fz166.com" target="_blank">亚洲av无码片在线播放</a>| <a href="http://367316.com" target="_blank">亚洲综合国产精品</a>| <a href="http://doctor5470.com" target="_blank">免费成人高清在线视频</a>| <a href="http://6266tv.com" target="_blank">我想看一级毛片免费的</a>| <a href="http://shadaiym.com" target="_blank">免费在线观看黄网</a>| <a href="http://sczxzt.com" target="_blank">日本中文字幕免费看</a>| <a href="http://wenfaka.com" target="_blank">亚洲国产黄在线观看</a>| <a href="http://3344by.com" target="_blank">草久免费在线观看网站</a>| <a href="http://baiyifuwu.com" target="_blank">99在线观看视频免费</a>| <a href="http://24aabb.com" target="_blank">亚洲精品成人在线</a>| <a href="http://fl6fe.com" target="_blank">亚洲免费二区三区</a>| <a href="http://dodxs.com" target="_blank">永久免费的网站在线观看</a>| <a href="http://qulu999.com" target="_blank">亚洲AV无码乱码在线观看裸奔</a>| <a href="http://taiyu18.com" target="_blank">久久久精品免费国产四虎</a>| <a href="http://438266.com" target="_blank">亚洲码一区二区三区</a>| <a href="http://gujingyuye.com" target="_blank">国产精品极品美女自在线观看免费</a>| <a href="http://qu41.com" target="_blank">国产麻豆视频免费观看</a>| <a href="http://bjhuicui.com" target="_blank">亚洲色偷偷综合亚洲AV伊人蜜桃 </a>| <a href="http://773311h.com" target="_blank">一级午夜免费视频</a>| <a href="http://henhenluc.com" target="_blank">aa级一级天堂片免费观看</a>| <a href="http://499k.com" target="_blank">亚洲制服丝袜第一页</a>| <a href="http://gdjiayou.com" target="_blank">无码精品人妻一区二区三区免费看</a>| <a href="http://wwwxue1888.com" target="_blank">亚洲男人天堂2017</a>| <a href="http://ynrygc.com" target="_blank">国产午夜成人免费看片无遮挡</a>| <a href="http://sflhb.com" target="_blank">亚洲国产精品免费视频</a>| <a href="http://9522952.com" target="_blank">久久精品免费全国观看国产</a>| <a href="http://pj9xx6.com" target="_blank">国产精品亚洲一区二区三区</a>| <a href="http://by6215.com" target="_blank">成视频年人黄网站免费视频</a>| <a href="http://023npxyy.com" target="_blank">亚洲大尺度无码无码专线一区</a>| <a href="http://dddd20.com" target="_blank">亚洲伊人久久综合影院</a>| <a href="http://51wdn.com" target="_blank">99ee6热久久免费精品6</a>| <a href="http://516698.com" target="_blank">亚洲精品国产综合久久久久紧</a>| <a href="http://www09191z.com" target="_blank">亚洲精品麻豆av</a>| <a href="http://bnb989.com" target="_blank">亚洲大片免费观看</a>| <a href="http://htsp777.com" target="_blank">亚洲精品国产成人专区</a>| <a href="http://fsdyzs.com" target="_blank">成年大片免费视频</a>| <a href="http://715686.com" target="_blank">国产真人无码作爱免费视频</a>| <a href="http://5tww.com" target="_blank">亚洲六月丁香六月婷婷蜜芽</a>| <a href="http://fuzhiwushu.com" target="_blank">亚洲国产小视频精品久久久三级</a>| <script> (function(){ var bp = document.createElement('script'); var curProtocol = window.location.protocol.split(':')[0]; if (curProtocol === 'https') { bp.src = 'https://zz.bdstatic.com/linksubmit/push.js'; } else { bp.src = 'http://push.zhanzhang.baidu.com/push.js'; } var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(bp, s); })(); </script> </body>