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榪欐牱灝辮浜?鍦ㄩ噸鏂板惎鍔?鏄笉鏄潰鏉塊兘鎭㈠鎴愰粯璁ょ殑鍟︺?/p>
濡傛灉榪樹笉琛?閭e氨
rm -rf .gconfd
1銆佷笉灝忓績璇垹闈㈡澘鐨勬仮澶嶆柟寮?br>
Linux浠g爜 鏀惰棌浠g爜
gconftool --recursive-unset /apps/panel
rm -rf ~/.gconf/apps/panel
pkill gnome-panel
2銆佷笉灝忓績鏇存敼榛樿涓婚椋庢牸鐨勬仮澶嶆柟寮?br>Linux浠g爜 鏀惰棌浠g爜
rm -rf /home/浣犺嚜宸辯殑鐢ㄦ埛鐩綍/.gconf*
sudo reboot now
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鎺ㄨ崘絎簩縐嶆柟娉曪紝娌繪湰涔嬮夈?/p>
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int findOneinBin(int n) { if(n<2) return 1; else return n%2+findOneinBin(n/2); }
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#define POW(c) (1<<(c)) #define MASK(c) (((unsigned long)-1) / (POW(POW(c)) + 1)) #define ROUND(n, c) (((n) & MASK(c)) + ((n) >> POW(c) & MASK(c))) int bit_count(unsigned int n) { n = ROUND(n, 0); n = ROUND(n, 1); n = ROUND(n, 2); n = ROUND(n, 3); n = ROUND(n, 4); return n; }
涓涓嬪瓙鐪嬩笉鏄庣櫧錛屽厛鎶婂畯灞曞紑鏉ワ細
POW鏄綆?鐨勫箓
MASK寰堝鎬紝涓涓叏1鐨勬棤絎﹀彿鏁板瓧闄や互2鐨勫箓鐨勫箓鍔?錛?br>濂藉湪鎵撳嵃鍑烘潵榪樿兘鐪嬪緱鎳傦細
MASK(0) = 55555555 h = 01010101010101010101010101010101 b
MASK(1) = 33333333 h = 00110011001100110011001100110011 b
MASK(2) = 0f0f0f0f h = 00001111000011110000111100001111 b
MASK(3) = 00ff00ff h = 00000000111111110000000011111111 b
MASK(4) = 0000ffff h = 00000000000000001111111111111111 b
榪欎簺mask鍒嗗埆鎶?2浣嶆暟瀛楀垝鍒嗕負鍑犱釜閮ㄥ垎銆傛瘡涓儴鍒嗙殑鍓嶄竴鍗婂拰鍚庝竴鍗婂垎鍒槸鍏?0'鍜屽叏'1'銆?br>MASK(0)鍒嗕負16涓儴鍒嗭紝MASK(1)鍒嗕負8涓儴鍒嗭紝...
ROUND涓n鐨勫鐞嗭細(n & MASK) + (n >> POW & MASK)
POW鐨勫煎垰濂芥槸MASK涓繛緇?0'(鎴栬呰繛緇?1')鐨勯暱搴︺備篃灝辨槸璇碦OUND鎶婄敱MASK鍒嗗紑鐨刵鐨勫悇涓儴鍒嗕腑鐨勯珮POW浣嶅拰浣嶱OW浣嶇浉鍔犮?br>涓轟簡渚夸簬璇存槑錛屽彇涓涓畝鍗曠殑閮ㄥ垎錛歁ASK(1)鐨?011
鍋囪n鐨勫間負1001錛岄偅涔圧OUND鍚庣殑緇撴灉灝辨槸10 + 01 = 11 b錛屾妸榪欎釜緇撴灉璧嬪肩粰n錛岃繖鏃秐鐨勫惈涔夌敱鍘熸潵鐨勪簩榪涘埗浣嶄覆鍙樹負'1'浣嶇殑鏁伴噺銆傜壒鍒殑錛屽綋ROUND(n, 0)鏃訛紝鎶妌褰撲綔涓涓?2涓儴鍒嗗悇鑷?1'浣嶇殑鏁伴噺銆傦紙'0'琛ㄧず娌℃湁'1'錛岃?1'鍒欒〃紺烘湁1涓?1'錛?br>璁$畻瀹宯 = ROUND(n, 0)鍚庯紝n鏄竴涓?6涓儴鍒嗗悇鑷?1'浣嶆暟閲忕殑'鏁扮粍'錛岃繖涓?鏁扮粍'鐨勬瘡涓厓绱犲彧鏈?涓簩榪涘埗浣嶃傛渶澶у間負2錛岃凍澶熺敱2涓簩榪涘埗浣嶆潵琛ㄧず銆?br>鎺ヤ笅鏉ワ紝璁$畻瀹宯=ROUND(n,1)鍚庯紝n鏄竴涓?涓儴鍒嗗悇鑷?1'浣嶆暟閲忕殑'鏁扮粍'錛岃繖涓?鏁扮粍'鐨勬瘡涓厓绱犲彧鏈?涓簩榪涘埗浣嶃傛渶澶у間負4錛岃凍澶熺敱4涓簩榪涘埗浣嶆潵琛ㄧず銆傦紙瀹為檯鍙渶瑕?涓簩榪涘埗浣嶏級
...
鏈鍚庝竴姝ワ紝璁$畻n=ROUND(n,4)鍚庯紝n鏄竴涓?涓儴鍒嗗悇鑷?1'浣嶆暟閲忕殑'鏁扮粍'錛岃繖涓?鏁扮粍'鐨勬瘡涓厓绱犳湁32涓簩榪涘埗浣嶃傛渶澶у間負32錛岃凍澶熺敱32涓簩榪涘埗浣嶆潵琛ㄧず銆傦紙瀹為檯鍙渶瑕?涓簩榪涘埗浣嶏級
榪欎釜浠h〃32浣嶅唴'1'浣嶆暟閲忕殑32浣嶄簩榪涘埗鏁頒篃灝辨槸鎴戜滑瑕佹眰鐨勭粨鏋溿?
涓
絎竴鏈濂戒笉鐩歌錛屽姝や究鍙笉鐩告亱銆?br>絎簩鏈濂戒笉鐩哥煡錛屽姝や究鍙笉鐩告濄?br>絎笁鏈濂戒笉鐩鎬即錛屽姝や究鍙笉鐩告瑺銆?br>絎洓鏈濂戒笉鐩告儨錛屽姝や究鍙笉鐩稿繂銆?br>絎簲鏈濂戒笉鐩哥埍錛屽姝や究鍙笉鐩稿純銆?br>絎叚鏈濂戒笉鐩稿錛屽姝や究鍙笉鐩鎬細銆?br>絎竷鏈濂戒笉鐩歌錛屽姝や究鍙笉鐩歌礋銆?br>絎叓鏈濂戒笉鐩歌錛屽姝や究鍙笉鐩哥畫銆?br>絎節鏈濂戒笉鐩鎬緷錛屽姝や究鍙笉鐩稿亷銆?br>絎崄鏈濂戒笉鐩擱亣錛屽姝や究鍙笉鐩歌仛銆?br>浣嗘浘鐩歌渚跨浉鐭ワ紝鐩歌浣曞涓嶈鏃躲?br>瀹夊緱涓庡悰鐩歌瘈緇濓紝鍏嶆暀鐢熸浣滅浉鎬濄?/b>
浜?/strong>
浣犺錛屾垨鑰呬笉瑙佹垜
鎴戝氨鍦ㄩ偅閲?br>涓嶆偛涓嶅枩
浣犲康錛屾垨鑰呬笉蹇墊垜
鎯呭氨鍦ㄩ偅閲?br>涓嶆潵涓嶅幓
浣犵埍錛屾垨鑰呬笉鐖辨垜
鐖卞氨鍦ㄩ偅閲?br>涓嶅涓嶅噺
浣犺窡錛屾垨鑰呬笉璺熸垜
鎴戠殑鎵嬪氨鍦ㄤ綘鎵嬮噷
涓嶈垗涓嶅純
鏉ユ垜鐨勬閲?br>鎴栬?br>璁╂垜浣忚繘浣犵殑蹇冮噷
榛樼劧銆鐩哥埍
瀵傞潤銆嬈㈠枩
涓?/strong>
浣忚繘甯冭揪鎷夊錛?br>鎴戞槸闆煙鏈澶х殑鐜嬨?br>嫻佹氮鍦ㄦ媺钀ㄨ澶達紝
鎴戞槸涓栭棿鏈緹庣殑鎯呴儙銆?
鎴戦棶浣涳細涓轟綍涓嶇粰鎵鏈夊コ瀛愮緸鑺遍棴鏈堢殑瀹歸錛?br>浣涙洶錛氶偅鍙槸鏄欒姳鐨勪竴鐜幫紝鐢ㄦ潵钂欒斀涓栦織鐨勭溂
鎴戦棶浣涳細涓栭棿涓轟綍鏈夐偅涔堝閬楁喚錛?br>浣涙洶錛氳繖鏄竴涓﹩濞戜笘鐣岋紝濠嗗☉鍗抽仐鎲?br>鎴戦棶浣涳細濡備綍璁╀漢浠殑蹇冧笉鍐嶆劅鍒板鍗曪紵
浣涙洶錛氭瘡涓棰楀績鐢熸潵灝辨槸瀛ゅ崟鑰屾畫緙虹殑
鎴戦棶浣涳細濡傛灉閬囧埌浜嗗彲浠ョ埍鐨勪漢錛屽嵈鍙堟曚笉鑳芥妸鎻¤鎬庝箞鍔烇紵
浣涙洶錛氱暀浜洪棿澶氬皯鐖憋紝榪庢誕涓栧崈閲嶅彉
鎴戦棶浣涳細濡備綍鎵嶈兘濡備綘鑸澘鏅猴紵
浣涙洶錛氫經鏄繃鏉ヤ漢錛屼漢鏄湭鏉ヤ經
鎴戦棶浣涳細涓轟粈涔堟繪槸鍦ㄦ垜鎮蹭激鐨勬椂鍊欎笅闆?br>浣涜錛氬啲澶╁氨瑕佽繃鍘伙紝鐣欑偣璁板繂
鎴戦棶浣?涓轟粈涔堟瘡嬈′笅闆兘鏄垜涓嶅湪鎰忕殑澶滄櫄
浣涜:涓嶇粡鎰忕殑鏃跺欎漢浠諱細閿欒繃寰堝鐪熸鐨勭編涓?br>鎴戦棶浣?閭h繃鍑犲ぉ榪樹笅涓嶄笅闆?br>浣涜:涓嶈鍙洴鐫榪欎釜瀛h妭錛岄敊榪囦簡浠婂啲
緇撴瀯浣撹繕鏄湁寰堝鐨勫尯鍒?/p>
1.綾繪垚鍛橀粯璁よ闂潈闄愪負縐佹湁錛坧rivate錛夛紝緇撴瀯浣撴垚鍛橀粯璁よ闂潈闄愪負鍏叡錛坧ublic錛夛紱
2.浠巆lass緇ф壙榛樿鏄痯rivate緇ф壙錛岃屼粠struct緇ф壙榛樿鏄痯ublic緇ф壙銆?/p>
娉ㄦ剰錛欳涓殑struct璺烠++涓璼truct鍙槸涓嶄竴鏍風殑
*鍏辯敤浣?鏋勯犳暟鎹被鍨?涔熷彨鑱斿悎浣?
鐢ㄩ旓細浣垮嚑涓笉鍚岀被鍨嬬殑鍙橀噺鍏卞崰涓孌靛唴瀛?鐩鎬簰瑕嗙洊)
緇撴瀯浣撴槸涓縐嶆瀯閫犳暟鎹被鍨?
鐢ㄩ旓細鎶婁笉鍚岀被鍨嬬殑鏁版嵁緇勫悎鎴愪竴涓暣浣?------鑷畾涔夋暟鎹被鍨?
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緇撴瀯浣撳彉閲忔墍鍗犲唴瀛橀暱搴︽槸鍚勬垚鍛樺崰鐨勫唴瀛橀暱搴︾殑鎬誨拰銆?
鍏卞悓浣撳彉閲忔墍鍗犲唴瀛橀暱搴︽槸鍚勬渶闀跨殑鎴愬憳鍗犵殑鍐呭瓨闀垮害銆?
鍏卞悓浣撴瘡嬈″彧鑳藉瓨鏀懼摢涓殑涓縐嶏紒錛?
鍏卞悓浣撳彉閲忎腑璧蜂綔鐢ㄧ殑鎴愬憳鏄皧鍚庝竴嬈″瓨鏀劇殑鎴愬憳錛?
鍦ㄥ瓨鍏ユ柊鐨勬垚鍛樺悗鍘熸湁鐨勬垚鍛樺け鍘諱簡浣滅敤錛?
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struct 涓?union涓昏鏈変互涓嬪尯鍒?
1. struct鍜寀nion閮芥槸鐢卞涓笉鍚岀殑鏁版嵁綾誨瀷鎴愬憳緇勬垚, 浣嗗湪浠諱綍鍚屼竴鏃跺埢, union涓彧瀛樻斁浜嗕竴涓閫変腑鐨勬垚鍛? 鑰宻truct鐨勬墍鏈夋垚鍛橀兘瀛樺湪銆傚湪struct涓紝鍚勬垚鍛橀兘鍗犳湁鑷繁鐨勫唴瀛樼┖闂達紝瀹冧滑鏄悓鏃跺瓨鍦ㄧ殑銆備竴涓猻truct鍙橀噺鐨勬婚暱搴︾瓑浜庢墍鏈夋垚鍛橀暱搴︿箣鍜屻傚湪Union涓紝鎵鏈夋垚鍛樹笉鑳藉悓鏃跺崰鐢ㄥ畠鐨勫唴瀛樼┖闂達紝瀹冧滑涓嶈兘鍚屾椂瀛樺湪銆俇nion鍙橀噺鐨勯暱搴︾瓑浜庢渶闀跨殑鎴愬憳鐨勯暱搴︺?
2. 瀵逛簬union鐨勪笉鍚屾垚鍛樿祴鍊? 灝嗕細瀵瑰叾瀹冩垚鍛橀噸鍐? 鍘熸潵鎴愬憳鐨勫煎氨涓嶅瓨鍦ㄤ簡, 鑰屽浜巗truct鐨勪笉鍚屾垚鍛樿祴鍊兼槸浜掍笉褰卞搷鐨勩?
寮曠敤錛氬氨鏄彉閲忔垨瀵硅薄鐨勫埆鍚嶏紝瀹冧笉鏄鹼紝涓嶅崰瀛樺偍絀洪棿錛屽叾鍙湁澹版槑娌℃湁瀹氫箟錛屽叾涓昏鐢ㄤ簬鍑芥暟鐨勫艦鍙傚拰鍑芥暟鐨勮繑鍥炲箋?/p>
娉ㄦ剰錛氬紩鐢ㄤ綔涓哄嚱鏁扮殑榪斿洖鍊鹼紝澶у鏁版儏鍐典笅鍙互琚寚閽堜唬鏇匡紝浣嗘槸閬囧埌鏋勯犲嚱鏁板拰鎿嶄綔絎﹂噸杞藉嚱鏁扮殑鈥滃艦寮忚嚜鐒垛濈殑闂鏄紝鏄笉鑳借鏇夸唬鐨勩?/p>
寮曠敤鍜屾寚閽堝尯鍒細
鍐呭瓨鍖哄煙 | 璇存槑 |
鏍堝尯錛坰tack錛?/font> | 鐢辯紪璇戝櫒鑷姩鍒嗛厤閲婃斁錛屽瓨鏀句負榪愯鍑芥暟鑰屽垎閰嶇殑灞閮ㄥ彉閲忋佸嚱鏁板弬鏁般佽繑鍥炴暟鎹佽繑鍥炲湴鍧絳夈傚叾鎿嶄綔鏂瑰紡綾諱技浜庢暟鎹粨鏋勪腑鐨勬爤銆?/font> |
鍫嗗尯錛坔eap錛?/font> | 涓鑸湁紼嬪簭鍛樺垎閰嶉噴鏀撅紝鑻ョ▼搴忓憳涓嶉噴鏀撅紝紼嬪簭緇撴潫鏃跺彲鑳芥湁緋葷粺鍥炴敹銆傚垎閰嶆柟寮忕被浼間簬閾捐〃銆?/font> |
鍏ㄥ眬鍖猴紙static錛?/font> | 瀛樻斁鍏ㄥ眬鍙橀噺銆侀潤鎬佹暟鎹佸父閲忋傜▼搴忕粨鏉熷悗鏈夌郴緇熼噴鏀俱?/font> |
鏂囧瓧甯擱噺鍖?/font> | 甯擱噺瀛楃涓插氨鏄斁鍦ㄨ繖閲岋紱紼嬪簭緇撴潫鍚庢湁緋葷粺閲婃斁銆?/font> |
紼嬪簭浠g爜鍖?/font> | 瀛樻斁鍑芥暟浣擄紙綾繪垚鍛樺嚱鏁板拰鍏ㄥ眬鍑芥暟錛夌殑浜岃繘鍒朵唬鐮併?/font> |
瀹炰緥鍒嗘瀽錛?/font>
int a=0; //鍏ㄥ眬鍖哄垵濮嬪寲鍖? char *p1; //鍏ㄥ眬鍖烘湭鍒濆鍖栧尯 static char b; //鍏ㄥ眬鍖烘湭鍒濆鍖栭潤鎬佸彉閲? int main() { int c; //鏍堝尯涓存椂鍙橀噺 char s[]="abc"; //鏍堝尯涓存椂鏁扮粍鍙橀噺 char *p2; //鏍堝尯涓存椂鎸囬拡鍙橀噺 char *p3="123"; //甯擱噺鍖哄父閲忥紝鏍堝尯鎸囬拡鍙橀噺 static int d=0; //鍏ㄥ眬鍒濆鍖栧尯闈欐佸彉閲? p1=new char[10]; //鍫嗗尯鍒嗛厤10涓瓧絎︾┖闂? p2=new char[20]; //鍫嗗尯鍒嗛厤20涓瓧絎︾┖闂? strcpy(p1,"123"); //"123"鏀懼湪甯擱噺鍖猴紝緙栬瘧鍣ㄦ湁鍙兘灝嗗畠涓巔3鎵鎸囧悜鐨勫尯鍩熺浉鍚?/span>
}
鍐呭瓨鍒嗛厤鏂瑰紡錛?/font>
鍫嗗拰鏍堢┒鍖哄埆錛?/font>
涓昏鐨勫尯鍒敱浠ヤ笅鍑犵偣錛?br> 1.綆$悊鏂瑰紡錛氬浜庢爤鏉ヨ錛屾槸鐢辯紪璇戝櫒鑷姩綆$悊錛屾棤闇鎴戜滑鎵嬪伐鎺у埗錛涘浜庡爢鏉ヨ錛岄噴鏀懼伐浣滅敱紼嬪簭鍛樻帶鍒訛紝瀹規槗浜х敓memory leak銆?br>
2.絀洪棿澶у皬錛氫竴鑸潵璁插湪32浣嶇郴緇熶笅錛屽爢鍐呭瓨鍙互杈懼埌4G鐨勭┖闂達紝浠庤繖涓搴︽潵鐪嬪爢鍐呭瓨鍑犱箮鏄病鏈変粈涔堥檺鍒剁殑銆備絾鏄浜庢爤鏉ヨ錛屼竴鑸兘鏄湁涓瀹氱殑絀洪棿澶у皬 鐨勶紝渚嬪錛屽湪VC6涓嬮潰錛岄粯璁ょ殑鏍堢┖闂村ぇ灝忔槸1M錛堝ソ鍍忔槸錛岃涓嶆竻妤氫簡錛夈傚綋鐒訛紝鎴戜滑鍙互淇敼錛?br>鎵撳紑宸ョ▼錛屼緷嬈℃搷浣滆彍鍗曞涓嬶細Project->Setting->Link錛屽湪Category 涓変腑Output錛岀劧鍚庡湪Reserve涓瀹氬爢鏍堢殑鏈澶у煎拰commit銆?br> 娉ㄦ剰錛歳eserve鏈灝忓間負4Byte錛沜ommit鏄繚鐣欏湪铏氭嫙鍐呭瓨鐨勯〉鏂囦歡閲岄潰錛屽畠璁劇疆鐨勮緝澶т細浣挎爤寮杈熻緝澶х殑鍊鹼紝鍙兘澧炲姞鍐呭瓨鐨勫紑閿鍜屽惎鍔ㄦ椂闂淬?br>
3.紕庣墖闂錛氬浜庡爢鏉ヨ錛岄綣佺殑new/delete鍔垮繀浼氶犳垚鍐呭瓨絀洪棿鐨勪笉榪炵畫錛屼粠鑰岄犳垚澶ч噺鐨勭鐗囷紝浣跨▼搴忔晥鐜囬檷浣庛傚浜庢爤鏉ヨ錛屽垯涓嶄細瀛樺湪榪欎釜闂錛?鍥犱負鏍堟槸鍏堣繘鍚庡嚭鐨勯槦鍒楋紝浠栦滑鏄姝ょ殑涓涓瀵瑰簲錛屼互鑷充簬姘歌繙閮戒笉鍙兘鏈変竴涓唴瀛樺潡浠庢爤涓棿寮瑰嚭錛屽湪浠栧脊鍑轟箣鍓嶏紝鍦ㄤ粬涓婇潰鐨勫悗榪涚殑鏍堝唴瀹瑰凡緇忚寮瑰嚭錛岃緇嗙殑 鍙互鍙傝冩暟鎹粨鏋勶紝榪欓噷鎴戜滑灝變笉鍐嶄竴涓璁ㄨ浜嗐?br>
4.鐢熼暱鏂瑰悜錛氬浜庡爢鏉ヨ錛岀敓闀挎柟鍚戞槸鍚戜笂鐨勶紝涔熷氨鏄悜鐫鍐呭瓨鍦板潃澧炲姞鐨勬柟鍚戯紱瀵逛簬鏍堟潵璁詫紝瀹冪殑鐢熼暱鏂瑰悜鏄悜涓嬬殑錛屾槸鍚戠潃鍐呭瓨鍦板潃鍑忓皬鐨勬柟鍚戝闀褲?br>鍒嗛厤鏂瑰紡錛氬爢閮芥槸鍔ㄦ佸垎閰嶇殑錛屾病鏈夐潤鎬佸垎閰嶇殑鍫嗐傛爤鏈?縐嶅垎閰嶆柟寮忥細闈欐佸垎閰嶅拰鍔ㄦ佸垎閰嶃傞潤鎬佸垎閰嶆槸緙栬瘧鍣ㄥ畬鎴愮殑錛屾瘮濡傚眬閮ㄥ彉閲忕殑鍒嗛厤銆傚姩鎬佸垎閰嶇敱 alloca鍑芥暟榪涜鍒嗛厤錛屼絾鏄爤鐨勫姩鎬佸垎閰嶅拰鍫嗘槸涓嶅悓鐨勶紝浠栫殑鍔ㄦ佸垎閰嶆槸鐢辯紪璇戝櫒榪涜閲婃斁錛屾棤闇鎴戜滑鎵嬪伐瀹炵幇銆?br>
5.鍒嗛厤鏁堢巼錛氭爤鏄満鍣ㄧ郴緇熸彁渚涚殑鏁版嵁緇撴瀯錛岃綆楁満浼氬湪搴曞眰瀵規爤鎻愪緵鏀寔錛氬垎閰嶄笓闂ㄧ殑瀵勫瓨鍣ㄥ瓨鏀炬爤鐨勫湴鍧錛屽帇鏍堝嚭鏍堥兘鏈変笓闂ㄧ殑鎸囦護鎵ц錛岃繖灝卞喅瀹氫簡鏍堢殑鏁堢巼姣?杈冮珮銆傚爢鍒欐槸C/C++鍑芥暟搴撴彁渚涚殑錛屽畠鐨勬満鍒舵槸寰堝鏉傜殑錛屼緥濡備負浜嗗垎閰嶄竴鍧楀唴瀛橈紝搴撳嚱鏁頒細鎸夌収涓瀹氱殑綆楁硶錛堝叿浣撶殑綆楁硶鍙互鍙傝冩暟鎹粨鏋?鎿嶄綔緋葷粺錛夊湪鍫嗗唴瀛樹腑鎼滅儲鍙敤鐨勮凍澶熷ぇ灝忕殑絀洪棿錛屽鏋滄病鏈夎凍澶熷ぇ灝忕殑絀洪棿錛堝彲鑳芥槸鐢變簬鍐呭瓨紕庣墖澶錛夛紝灝辨湁鍙兘璋冪敤緋葷粺鍔熻兘鍘誨鍔犵▼搴忔暟鎹鐨勫唴瀛樼┖闂達紝榪欐牱灝辨湁鏈轟細鍒?鍒拌凍澶熷ぇ灝忕殑鍐呭瓨錛岀劧鍚庤繘琛岃繑鍥炪傛樉鐒訛紝鍫嗙殑鏁堢巼姣旀爤瑕佷綆寰楀銆?/font>
甯歌鐨勫唴瀛橀敊璇強鍏跺絳栵細
鍙戠敓鍐呭瓨閿欒鏄歡闈炲父楹葷儲鐨勪簨鎯呫傜紪璇戝櫒涓嶈兘鑷姩鍙戠幇榪欎簺閿欒錛岄氬父鏄湪紼嬪簭榪愯鏃舵墠鑳芥崟鎹夊埌銆傝岃繖浜涢敊璇ぇ澶氭病鏈夋槑鏄劇殑鐥囩姸錛屾椂闅愭椂鐜幫紝澧炲姞浜嗘敼閿欑殑闅懼害銆傚父瑙佺殑鍐呭瓨閿欒鍙婂叾瀵圭瓥濡備笅錛?
銆銆* 鍐呭瓨鍒嗛厤鏈垚鍔燂紝鍗翠嬌鐢ㄤ簡瀹冦?/font>
銆銆緙栫▼鏂版墜甯哥姱榪欑閿欒錛屽洜涓轟粬浠病鏈夋剰璇嗗埌鍐呭瓨鍒嗛厤浼氫笉鎴愬姛銆傚父鐢ㄨВ鍐沖姙娉曟槸錛屽湪浣跨敤鍐呭瓨涔嬪墠媯鏌ユ寚閽堟槸鍚︿負NULL銆傚鏋滄寚閽坧鏄嚱鏁扮殑鍙傛暟錛岄偅涔堝湪鍑芥暟鐨勫叆鍙e鐢╝ssert(p!=NULL)榪涜媯鏌ャ傚鏋滄槸鐢╩alloc鎴杗ew鏉ョ敵璇峰唴瀛橈紝搴旇鐢╥f(p==NULL) 鎴杋f(p!=NULL)榪涜闃查敊澶勭悊銆?
* 鍐呭瓨鍒嗛厤铏界劧鎴愬姛錛屼絾鏄皻鏈垵濮嬪寲灝卞紩鐢ㄥ畠銆?/font>
銆銆鐘繖縐嶉敊璇富瑕佹湁涓や釜璧峰洜錛氫竴鏄病鏈夊垵濮嬪寲鐨勮蹇碉紱浜屾槸璇互涓哄唴瀛樼殑緙虹渷鍒濆煎叏涓洪浂錛屽鑷村紩鐢ㄥ垵鍊奸敊璇紙渚嬪鏁扮粍錛夈?鍐呭瓨鐨勭己鐪佸垵鍊肩┒绔熸槸浠涔堝茍娌℃湁緇熶竴鐨勬爣鍑嗭紝灝界鏈変簺鏃跺欎負闆跺鹼紝鎴戜滑瀹佸彲淇″叾鏃犱笉鍙俊鍏舵湁銆傛墍浠ユ棤璁虹敤浣曠鏂瑰紡鍒涘緩鏁扮粍錛岄兘鍒繕浜嗚祴鍒濆鹼紝鍗充究鏄祴闆跺間篃涓嶅彲鐪佺暐錛屼笉瑕佸珜楹葷儲銆?
銆銆* 鍐呭瓨鍒嗛厤鎴愬姛騫朵笖宸茬粡鍒濆鍖栵紝浣嗘搷浣滆秺榪囦簡鍐呭瓨鐨勮竟鐣屻?/font>
銆銆渚嬪鍦ㄤ嬌鐢ㄦ暟緇勬椂緇忓父鍙戠敓涓嬫爣鈥滃1鈥濇垨鑰呪滃皯1鈥濈殑鎿嶄綔銆傜壒鍒槸鍦╢or寰幆璇彞涓紝寰幆嬈℃暟寰堝鏄撴悶閿欙紝瀵艱嚧鏁扮粍鎿嶄綔瓚婄晫銆?
銆銆* 蹇樿浜嗛噴鏀懼唴瀛橈紝閫犳垚鍐呭瓨娉勯湶銆?/font>
銆銆鍚湁榪欑閿欒鐨勫嚱鏁版瘡琚皟鐢ㄤ竴嬈″氨涓㈠け涓鍧楀唴瀛樸傚垰寮濮嬫椂緋葷粺鐨勫唴瀛樺厖瓚籌紝浣犵湅涓嶅埌閿欒銆傜粓鏈変竴嬈$▼搴忕獊鐒舵鎺夛紝緋葷粺鍑虹幇鎻愮ず錛氬唴瀛樿楀敖銆?
銆銆鍔ㄦ佸唴瀛樼殑鐢寵涓庨噴鏀懼繀欏婚厤瀵癸紝紼嬪簭涓璵alloc涓巉ree鐨勪嬌鐢ㄦ鏁頒竴瀹氳鐩稿悓錛屽惁鍒欒偗瀹氭湁閿欒錛坣ew/delete鍚岀悊錛夈?
銆銆* 閲婃斁浜嗗唴瀛樺嵈緇х畫浣跨敤瀹冦?/font>
銆銆鏈変笁縐嶆儏鍐碉細
銆銆錛?錛夌▼搴忎腑鐨勫璞¤皟鐢ㄥ叧緋昏繃浜庡鏉傦紝瀹炲湪闅句互鎼炴竻妤氭煇涓璞$┒绔熸槸鍚﹀凡緇忛噴鏀句簡鍐呭瓨錛屾鏃跺簲璇ラ噸鏂拌璁℃暟鎹粨鏋勶紝浠庢牴鏈笂瑙e喅瀵硅薄綆$悊鐨勬販涔卞眬闈€?
銆銆錛?錛夊嚱鏁扮殑return璇彞鍐欓敊浜嗭紝娉ㄦ剰涓嶈榪斿洖鎸囧悜鈥滄爤鍐呭瓨鈥濈殑鈥滄寚閽堚濇垨鑰呪滃紩鐢ㄢ濓紝鍥犱負璇ュ唴瀛樺湪鍑芥暟浣撶粨鏉熸椂琚嚜鍔ㄩ攢姣併?
銆銆錛?錛変嬌鐢╢ree鎴杁elete閲婃斁浜嗗唴瀛樺悗錛屾病鏈夊皢鎸囬拡璁劇疆涓篘ULL銆傚鑷翠駭鐢熲滈噹鎸囬拡鈥濄?
銆愯鍒?銆戠敤malloc鎴杗ew鐢寵鍐呭瓨涔嬪悗錛屽簲璇ョ珛鍗蟲鏌ユ寚閽堝兼槸鍚︿負NULL銆傞槻姝嬌鐢ㄦ寚閽堝間負NULL鐨勫唴瀛樸?
銆愯鍒?銆戜笉瑕佸繕璁頒負鏁扮粍鍜屽姩鎬佸唴瀛樿祴鍒濆箋傞槻姝㈠皢鏈鍒濆鍖栫殑鍐呭瓨浣滀負鍙沖間嬌鐢ㄣ?
銆愯鍒?銆戦伩鍏嶆暟緇勬垨鎸囬拡鐨勪笅鏍囪秺鐣岋紝鐗瑰埆瑕佸綋蹇冨彂鐢熲滃1鈥濇垨鑰呪滃皯1鈥濇搷浣溿?
銆愯鍒?銆戝姩鎬佸唴瀛樼殑鐢寵涓庨噴鏀懼繀欏婚厤瀵癸紝闃叉鍐呭瓨娉勬紡銆?
銆銆銆愯鍒?銆戠敤free鎴杁elete閲婃斁浜嗗唴瀛樹箣鍚庯紝绔嬪嵆灝嗘寚閽堣緗負NULL錛岄槻姝駭鐢熲滈噹鎸囬拡鈥濄?
鏉ヨ嚜錛氱櫨搴︾櫨縐?
鍑芥暟鎸囬拡鏄寚鍚戝嚱鏁扮殑鎸囬拡鍙橀噺銆?鍥犺屸滃嚱鏁版寚閽堚濇湰韜鍏堝簲鏄?a >鎸囬拡鍙橀噺錛屽彧涓嶈繃璇ユ寚閽堝彉閲忔寚鍚戝嚱鏁般傝繖姝e鐢ㄦ寚閽堝彉閲忓彲鎸囧悜鏁村瀷鍙橀噺銆佸瓧絎﹀瀷銆?a >鏁扮粍涓鏍鳳紝榪欓噷鏄寚鍚戝嚱鏁般傚鍓嶆墍榪幫紝C鍦ㄧ紪璇戞椂錛屾瘡涓涓嚱鏁伴兘鏈変竴涓叆鍙e湴鍧錛岃鍏ュ彛鍦板潃灝辨槸鍑芥暟鎸囬拡鎵鎸囧悜鐨勫湴鍧銆傛湁浜嗘寚鍚戝嚱鏁扮殑鎸囬拡鍙橀噺鍚庯紝鍙敤璇ユ寚閽堝彉閲忚皟鐢ㄥ嚱鏁幫紝灝卞鍚岀敤鎸囬拡鍙橀噺鍙紩鐢ㄥ叾浠栫被鍨嬪彉閲忎竴鏍鳳紝鍦ㄨ繖浜涙蹇典笂鏄竴鑷寸殑銆傚嚱鏁版寚閽堟湁涓や釜鐢ㄩ旓細璋冪敤鍑芥暟鍜屽仛鍑芥暟鐨?a >鍙傛暟銆?
1. 鍑芥暟鎸囬拡澹版槑鏂規硶錛?/font>
銆愭暟鎹被鍨嬨戙?銆戙愭寚閽堝彉閲忓悕銆戯紙褰㈠弬鍒楄〃錛夛紱
娉?錛氣滃嚱鏁扮被鍨嬧濊鏄庡嚱鏁扮殑榪斿洖綾誨瀷錛岀敱浜庘?)鈥濈殑浼樺厛綰ч珮浜庘?鈥?鎵浠ユ寚閽堝彉閲忓悕澶栫殑鎷彿蹇呬笉鍙皯錛屽悗闈㈢殑鈥滃艦鍙傚垪琛ㄢ濊〃紺烘寚閽堝彉閲忔寚鍚戠殑鍑芥暟鎵甯︾殑鍙傛暟鍒楄〃銆備緥濡傦細
int func(int x); /* 澹版槑涓涓嚱鏁?*/
銆銆int (*f) (int x); /* 澹版槑涓涓嚱鏁版寚閽?*/
銆銆f=func; /* 灝唂unc鍑芥暟鐨勯鍦板潃璧嬬粰鎸囬拡f */
銆銆璧嬪兼椂鍑芥暟func涓嶅甫鎷彿錛屼篃涓嶅甫鍙傛暟錛岀敱浜巉unc浠h〃鍑芥暟鐨勯鍦板潃錛屽洜姝ょ粡榪囪祴鍊間互鍚庯紝鎸囬拡f灝辨寚鍚戝嚱鏁癴unc(x)鐨勪唬鐮佺殑棣栧湴鍧銆?
娉?錛氬嚱鏁版嫭鍙蜂腑鐨勫艦鍙傚彲鏈夊彲鏃狅紝瑙嗘儏鍐佃屽畾銆?
銆銆涓嬮潰鐨勭▼搴忚鏄庝簡鍑芥暟鎸囬拡璋冪敤鍑芥暟鐨勬柟娉曪細
#include <iostream> using namespace std; int max(int x,int y){return (x>y?x:y);} int main() { int (*ptr)(int,int ); int a,b,c; ptr=max; cin>>a>>b; c=(*ptr)(a,b); cout<<c<<endl; return 0; }
ptr鏄寚鍚戝嚱鏁扮殑鎸囬拡鍙橀噺錛屾墍浠ュ彲鎶婂嚱鏁癿ax()璧嬬粰ptr浣滀負ptr鐨勫鹼紝鍗蟲妸max()鐨勫叆鍙e湴鍧璧嬬粰ptr,浠ュ悗灝卞彲浠ョ敤ptr鏉ヨ皟鐢ㄨ鍑芥暟錛屽疄闄呬笂ptr鍜宮ax閮芥寚鍚戝悓涓涓叆鍙e湴鍧錛屼笉鍚屽氨鏄痯tr鏄竴涓寚閽堝彉閲忥紝涓嶅儚鍑芥暟鍚嶇О閭f牱鏄鐨勶紝瀹冨彲浠ユ寚鍚戜換浣曞嚱鏁幫紝灝辯湅浣犳兂鎬庝箞鍋氫簡銆傚湪紼嬪簭涓妸鍝釜鍑芥暟鐨勫湴鍧璧嬬粰瀹冿紝瀹冨氨鎸囧悜鍝釜鍑芥暟銆傝屽悗鐢ㄦ寚閽堝彉閲忚皟鐢ㄥ畠錛屽洜姝ゅ彲浠ュ厛鍚庢寚鍚戜笉鍚岀殑鍑芥暟銆?b>涓嶈繃娉ㄦ剰錛屾寚鍚戝嚱鏁扮殑鎸囬拡鍙橀噺娌℃湁++鍜?-榪愮畻錛岀敤鏃惰灝忓績銆?
2.鎸囬拡鍑芥暟鍜屽嚱鏁版寚閽堢殑鍖哄埆錛?/font>
1,榪欎袱涓蹇甸兘鏄畝縐幫紝鎸囬拡鍑芥暟鏄寚甯︽寚閽堢殑鍑芥暟錛屽嵆鏈川鏄竴涓嚱鏁般傛垜浠煡閬撳嚱鏁伴兘鍙堟湁榪斿洖綾誨瀷錛堝鏋滀笉榪斿洖鍊?/a>錛屽垯涓烘棤鍊煎瀷錛夛紝鍙笉榪囨寚閽堝嚱鏁拌繑鍥炵被鍨嬫槸鏌愪竴綾誨瀷鐨勬寚閽堛?
銆銆鍏跺畾涔夋牸寮忓涓嬫墍紺猴細
銆銆銆愯繑鍥炵被鍨?a >鏍囪瘑絎?/a>銆戙?*銆戙愯繑鍥炲悕縐般戯紙褰㈠紡鍙傛暟琛級
銆銆鏍規嵁鍒嗘瀽錛氶鍏堣鏄庢槸涓涓暟緇勶細鏁扮粍鍚峓]
銆銆鍏舵錛岃璇存槑鍏跺厓绱犵殑鏁版嵁綾誨瀷鎸囬拡:*鏁扮粍鍚峓].
銆銆鍐嶆錛岃鏄庣‘榪欐瘡涓涓暟緇勫厓绱犳槸鎸囧悜鍑芥暟鍏ュ彛鍦板潃鐨勬寚閽堬細鍑芥暟榪斿洖鍊肩被鍨?(*鏁扮粍鍚峓])().璇鋒敞鎰忥紝榪欓噷涓轟粈涔堣鎶娾?鏁扮粍鍚峓]鈥濈敤鎷彿鎵╄搗鏉ュ憿錛熷洜涓哄渾鎷彿鍜屾暟緇勮鏄庣鐨勪紭鍏堢駭鏄瓑鍚岀殑錛屽鏋滀笉鐢ㄥ渾鎷彿鎶婃寚閽堟暟緇勮鏄?a >琛ㄨ揪寮?/a>鎵╄搗鏉ワ紝鏍規嵁鍦嗘嫭鍙峰拰鏂規嫭鍙風殑緇撳悎鏂瑰悜錛岄偅涔?*鏁扮粍鍚峓]() 璇存槑鐨勬槸浠涔堝憿錛熸槸鍏冪礌榪斿洖鍊肩被鍨嬩負鎸囬拡鐨勫嚱鏁版暟緇勩傛湁榪欐牱鐨勫嚱鏁版暟紲栧悧錛熶笉鐭ラ亾銆傛墍浠ュ繀欏繪嫭璧鋒潵錛屼互淇濊瘉鏁扮粍鐨勬瘡涓涓厓绱犳槸鎸囬拡銆?
銆銆絎簩縐嶏紝钂欓獥娉曪細
銆銆灝界鍑芥暟涓嶆槸鍙橀噺錛屼絾瀹冨湪鍐呭瓨涓粛鏈夊叾鐗╃悊鍦板潃錛岃鍦板潃鑳藉璧嬬粰鎸囬拡鍙橀噺銆傝幏鍙栧嚱鏁板湴鍧鐨勬柟娉曟槸錛氱敤涓嶅甫鏈夋嫭鍙峰拰鍙傛暟鐨勫嚱鏁板悕寰楀埌銆?
銆銆鍑芥暟鍚嶇浉褰撲簬涓涓寚鍚戝叾鍑芥暟鍏ュ彛鎸囬拡甯擱噺銆?閭d箞鏃㈢劧鍑芥暟鍚嶆槸涓涓寚閽堝父閲忥紝閭d箞灝卞彲浠ュ鍏惰繘琛屼竴浜涚浉搴旂殑澶勭悊錛屽寮哄埗綾誨瀷杞崲銆?
銆銆閭d箞鎴戜滑灝卞彲浠ユ妸榪欎釜鍦板潃鏀懼湪涓涓暣褰㈡寚閽堟暟緇勪腑錛岀劧鍚庝綔涓哄嚱鏁版寚閽堣皟鐢ㄥ嵆鍙?
銆銆瀹屾暣渚嬪瓙錛?#include <iostream>
int add1(int a1,int b1);
int add2(int a2,int b2);
int main()
{
int numa1=1,numb1=2;
int numa2=2,numb2=3;
int (*op[2])(int a,int b);
op[0]=add1;
op[1]=add2;
printf("%d ,%d\n",op[0](numa1,numb1),op[1](numa2,numb2));
system("PAUSE");
return 0;
}
int add1(int a1,int b1)
{
return a1+b1;
}
int add2(int a2,int b2)
{
return a2+b2;
}
]]>
#include<iostream> using namespace std; int main() { char str1[]="abc"; char str2[]="abc"; const char str3[]="abc"; const char str4[]="abc"; const char *str5="abc"; const char *str6="abc"; char *str7="abc"; char *str8="abc"; cout<<(str1==str2)<<endl; cout<<(str3==str4)<<endl; cout<<(str5==str6)<<endl; cout<<(str7==str8)<<endl; getchar(); }
緇撴灉鏄細
涓虹椹憿錛?/p>
鍐欎釜浠g爜鏉ョ湅鐪嬪唴瀛樺湴鍧錛?/p>
#include<iostream> using namespace std; int main() { char str1[]="abc"; char str2[]="abc"; const char str3[]="abc"; const char str4[]="abc"; const char *str5="abc"; const char *str6="abc"; char *str7="abc"; char *str8="abc"; printf("abc: %d\n",&("abc")); printf("str1: %d\n",str1); printf("str2: %d\n",str2); printf("str3: %d\n",str3); printf("str4: %d\n",str4); printf("str5: %d\n",str5); printf("str6: %d\n",str6); printf("str7: %d\n",str7); printf("str8: %d\n",str8); getchar(); return 0; }
緇撴灉鏄細
鍒嗘瀽錛?/p>
str1錛宻tr2錛宻tr3錛宻tr4鏄暟緇勫彉閲忥紝瀹冧滑鏈夊悇鑷殑絀洪棿錛岃屾暟緇勫悕灝辨槸鏁扮粍鐨勯鍦板潃銆?/p>
str5錛宻tr6錛宻tr7錛宻tr8鏄寚閽堬紝瀹冧滑鎸囧悜浜嗙浉鍚岀殑甯擱噺鍖哄煙銆?/p>