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[杞琞緇忓吀鏀惰棌涔?- C++鍐呭瓨綆$悊璇﹁Вhttp://www.shnenglu.com/hyjune/articles/50762.html璧墊搗鍐?/dc:creator>璧墊搗鍐?/author>Thu, 22 May 2008 06:54:00 GMThttp://www.shnenglu.com/hyjune/articles/50762.htmlhttp://www.shnenglu.com/hyjune/comments/50762.htmlhttp://www.shnenglu.com/hyjune/articles/50762.html#Feedback0http://www.shnenglu.com/hyjune/comments/commentRss/50762.htmlhttp://www.shnenglu.com/hyjune/services/trackbacks/50762.htmlfrom: http://dev.csdn.net/author/xpzhang/5f58e10eec1a4b76bd58ff37f05d30fb.html

浼熷ぇ鐨凚ill Gates 鏇劇粡澶辮█錛?br>
銆銆640K ought to be enough for everybody 鈥?Bill Gates 1981

銆銆紼嬪簭鍛樹滑緇忓父緙栧啓鍐呭瓨綆$悊紼嬪簭錛屽線寰鎻愬績鍚婅儐銆傚鏋滀笉鎯寵Е闆鳳紝鍞竴鐨勮В鍐沖姙娉曞氨鏄彂鐜版墍鏈夋綔浼忕殑鍦伴浄騫朵笖鎺掗櫎瀹冧滑錛岃翰鏄翰涓嶄簡鐨勩傛湰鏂囩殑鍐呭姣斾竴鑸暀縐戜功鐨勮娣卞叆寰楀錛岃鑰呴渶緇嗗績闃呰錛屽仛鍒扮湡姝e湴閫氭檽鍐呭瓨綆$悊銆?br>
銆銆1銆佸唴瀛樺垎閰嶆柟寮?/strong>

銆銆鍐呭瓨鍒嗛厤鏂瑰紡鏈変笁縐嶏細

銆銆錛?錛変粠闈欐佸瓨鍌ㄥ尯鍩熷垎閰嶃傚唴瀛樺湪紼嬪簭緙栬瘧鐨勬椂鍊欏氨宸茬粡鍒嗛厤濂斤紝榪欏潡鍐呭瓨鍦ㄧ▼搴忕殑鏁翠釜榪愯鏈熼棿閮藉瓨鍦ㄣ備緥濡傚叏灞鍙橀噺錛宻tatic鍙橀噺銆?br>
銆銆錛?錛夊湪鏍堜笂鍒涘緩銆傚湪鎵ц鍑芥暟鏃訛紝鍑芥暟鍐呭眬閮ㄥ彉閲忕殑瀛樺偍鍗曞厓閮藉彲浠ュ湪鏍堜笂鍒涘緩錛屽嚱鏁版墽琛岀粨鏉熸椂榪欎簺瀛樺偍鍗曞厓鑷姩琚噴鏀俱傛爤鍐呭瓨鍒嗛厤榪愮畻鍐呯疆浜庡鐞嗗櫒鐨勬寚浠ら泦涓紝鏁堢巼寰堥珮錛屼絾鏄垎閰嶇殑鍐呭瓨瀹歸噺鏈夐檺銆?br>
銆銆錛?錛?浠庡爢涓婂垎閰嶏紝浜︾О鍔ㄦ佸唴瀛樺垎閰嶃傜▼搴忓湪榪愯鐨勬椂鍊欑敤malloc鎴杗ew鐢寵浠繪剰澶氬皯鐨勫唴瀛橈紝紼嬪簭鍛樿嚜宸辮礋璐e湪浣曟椂鐢╢ree鎴杁elete閲婃斁鍐呭瓨銆傚姩鎬佸唴瀛樼殑鐢熷瓨鏈熺敱鎴戜滑鍐沖畾錛屼嬌鐢ㄩ潪甯哥伒媧伙紝浣嗛棶棰樹篃鏈澶氥?br>
銆銆2銆佸父瑙佺殑鍐呭瓨閿欒鍙婂叾瀵圭瓥

銆銆鍙戠敓鍐呭瓨閿欒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傛湁鏃剁敤鎴鋒掓皵鍐插啿鍦版妸浣犳壘鏉ワ紝紼嬪簭鍗存病鏈夊彂鐢熶換浣曢棶棰橈紝浣犱竴璧幫紝閿欒鍙堝彂浣滀簡銆?甯歌鐨勫唴瀛橀敊璇強鍏跺絳栧涓嬶細

銆銆* 鍐呭瓨鍒嗛厤鏈垚鍔燂紝鍗翠嬌鐢ㄤ簡瀹冦?br>
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

銆銆媯鏌ャ傚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?br>
銆銆* 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?br>
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? 涔熶笉鍙渷鐣ワ紝涓嶈瀚岄夯鐑︺?br>
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?br>
銆銆渚嬪鍦ㄤ嬌鐢ㄦ暟緇勬椂緇忓父鍙戠敓涓嬫爣“澶?”鎴栬?#8220;灝?”鐨勬搷浣溿傜壒鍒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?br>
銆銆* 蹇樿浜嗛噴鏀懼唴瀛橈紝閫犳垚鍐呭瓨娉勯湶銆?br>
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?br>
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?br>
銆銆* 閲婃斁浜嗗唴瀛樺嵈緇х畫浣跨敤瀹冦?br>銆
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€?br>
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“鏍堝唴瀛?#8221;鐨?#8220;鎸囬拡”鎴栬?#8220;寮曠敤”錛屽洜涓鴻鍐呭瓨鍦ㄥ嚱鏁頒綋緇撴潫鏃惰鑷姩閿姣併?br>
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?#8220;閲庢寚閽?#8221;銆?br>
銆銆銆愯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?br>
銆銆銆愯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?br>
銆銆銆愯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?#8220;澶?”鎴栬?#8220;灝?”鎿嶄綔銆?br>
銆銆銆愯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?br>
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?#8220;閲庢寚閽?#8221;銆?br>
銆銆3銆佹寚閽堜笌鏁扮粍鐨勫姣?/strong>

銆銆C++/C紼嬪簭涓紝鎸囬拡鍜屾暟緇勫湪涓嶅皯鍦版柟鍙互鐩鎬簰鏇挎崲鐫鐢紝璁╀漢浜х敓涓縐嶉敊瑙夛紝浠ヤ負涓よ呮槸絳変環鐨勩?br>
銆銆鏁扮粍瑕佷箞鍦ㄩ潤鎬佸瓨鍌ㄥ尯琚垱寤猴紙濡傚叏灞鏁扮粍錛夛紝瑕佷箞鍦ㄦ爤涓婅鍒涘緩銆傛暟緇勫悕瀵瑰簲鐫錛堣屼笉鏄寚鍚戯級涓鍧楀唴瀛橈紝鍏跺湴鍧涓庡閲忓湪鐢熷懡鏈熷唴淇濇寔涓嶅彉錛屽彧鏈夋暟緇勭殑鍐呭鍙互鏀瑰彉銆?br>
銆銆鎸囬拡鍙互闅忔椂鎸囧悜浠繪剰綾誨瀷鐨勫唴瀛樺潡錛屽畠鐨勭壒寰佹槸“鍙彉”錛屾墍浠ユ垜浠父鐢ㄦ寚閽堟潵鎿嶄綔鍔ㄦ佸唴瀛樸傛寚閽堣繙姣旀暟緇勭伒媧伙紝浣嗕篃鏇村嵄闄┿?br>
銆銆涓嬮潰浠ュ瓧絎︿覆涓轟緥姣旇緝鎸囬拡涓庢暟緇勭殑鐗規с?br>
銆銆3.1 淇敼鍐呭

紺轟緥3-1涓紝瀛楃鏁扮粍a鐨勫閲忔槸6涓瓧絎︼紝鍏跺唴瀹逛負hello銆俛鐨勫唴瀹瑰彲浠ユ敼鍙橈紝濡俛[0]= ‘X’銆傛寚閽坧鎸囧悜甯擱噺瀛楃涓?#8220;world”錛堜綅浜庨潤鎬佸瓨鍌ㄥ尯錛屽唴瀹逛負world錛夛紝甯擱噺瀛楃涓茬殑鍐呭鏄笉鍙互琚慨鏀圭殑銆備粠璇硶涓婄湅錛岀紪璇戝櫒騫朵笉瑙夊緱璇彞 p[0]= ‘X’鏈変粈涔堜笉濡ワ紝浣嗘槸璇ヨ鍙ヤ紒鍥句慨鏀瑰父閲忓瓧絎︿覆鐨勫唴瀹硅屽鑷磋繍琛岄敊璇?br>

char a[] = “hello”;
a[0] = ‘X’;
cout << a << endl;
char *p = “world”; // 娉ㄦ剰p鎸囧悜甯擱噺瀛楃涓?br>p[0] = ‘X’; // 緙栬瘧鍣ㄤ笉鑳藉彂鐜拌閿欒
cout << p << endl;
紺轟緥3.1 淇敼鏁扮粍鍜屾寚閽堢殑鍐呭

銆銆3.2 鍐呭澶嶅埗涓庢瘮杈?br>
銆銆涓嶈兘瀵規暟緇勫悕榪涜鐩存帴 澶嶅埗涓庢瘮杈冦傜ず渚?-3-2涓紝鑻ユ兂鎶婃暟緇刟鐨勫唴瀹瑰鍒剁粰鏁扮粍b錛屼笉鑳界敤璇彞 b = a 錛屽惁鍒欏皢浜х敓緙栬瘧閿欒銆傚簲璇ョ敤鏍囧噯搴撳嚱鏁皊trcpy榪涜澶嶅埗銆傚悓鐞嗭紝姣旇緝b鍜宎鐨勫唴瀹規槸鍚︾浉鍚岋紝涓嶈兘鐢╥f(b==a) 鏉ュ垽鏂紝搴旇鐢ㄦ爣鍑嗗簱鍑芥暟strcmp榪涜姣旇緝銆?br>
銆銆璇彞p = a 騫朵笉鑳芥妸a鐨勫唴瀹瑰鍒舵寚閽坧錛岃屾槸鎶奱鐨勫湴鍧璧嬬粰浜唒銆傝鎯沖鍒禷鐨勫唴瀹癸紝鍙互鍏堢敤搴撳嚱鏁癿alloc涓簆鐢寵涓鍧楀閲忎負strlen(a)+1涓瓧絎︾殑 鍐呭瓨錛屽啀鐢╯trcpy榪涜瀛楃涓插鍒躲傚悓鐞嗭紝璇彞if(p==a) 姣旇緝鐨勪笉鏄唴瀹硅屾槸鍦板潃錛屽簲璇ョ敤搴撳嚱鏁皊trcmp鏉ユ瘮杈冦?br>
// 鏁扮粍…
char a[] = "hello";
char b[10];
strcpy(b, a); // 涓嶈兘鐢?b = a;
if(strcmp(b, a) == 0) // 涓嶈兘鐢?if (b == a)

// 鎸囬拡…
int len = strlen(a);
char *p = (char *)malloc(sizeof(char)*(len+1));
strcpy(p,a); // 涓嶈鐢?p = a;
if(strcmp(p, a) == 0) // 涓嶈鐢?if (p == a)
紺轟緥3.2 鏁扮粍鍜屾寚閽堢殑鍐呭澶嶅埗涓庢瘮杈?br>
銆銆3.3 璁$畻鍐呭瓨瀹歸噺

銆銆鐢ㄨ繍綆楃 sizeof鍙互璁$畻鍑烘暟緇勭殑瀹歸噺錛堝瓧鑺傛暟錛夈傜ず渚?-3-3錛坅錛変腑錛宻izeof(a)鐨勫兼槸12錛堟敞鎰忓埆蹇樹簡’’錛夈傛寚閽坧鎸囧悜a錛屼絾鏄? sizeof(p)鐨勫煎嵈鏄?銆傝繖鏄洜涓簊izeof(p)寰楀埌鐨勬槸涓涓寚閽堝彉閲忕殑瀛楄妭鏁幫紝鐩稿綋浜巗izeof(char*)錛岃屼笉鏄痯鎵鎸囩殑鍐呭瓨瀹歸噺銆? C++/C璇█娌℃湁鍔炴硶鐭ラ亾鎸囬拡鎵鎸囩殑鍐呭瓨瀹歸噺錛岄櫎闈炲湪鐢寵鍐呭瓨鏃惰浣忓畠銆?br>
銆銆娉ㄦ剰褰撴暟緇勪綔涓哄嚱鏁扮殑鍙傛暟榪涜浼犻掓椂錛岃鏁扮粍鑷姩閫鍖栦負鍚岀被鍨嬬殑鎸囬拡銆傜ず渚?-3-3錛坆錛変腑錛屼笉璁烘暟緇刟鐨勫閲忔槸澶氬皯錛宻izeof(a)濮嬬粓絳変簬sizeof(char *)銆?br>
char a[] = "hello world";
char *p = a;
cout<< sizeof(a) << endl; // 12瀛楄妭
cout<< sizeof(p) << endl; // 4瀛楄妭
紺轟緥3.3錛坅錛?璁$畻鏁扮粍鍜屾寚閽堢殑鍐呭瓨瀹歸噺

void Func(char a[100])
{
銆cout<< sizeof(a) << endl; // 4瀛楄妭鑰屼笉鏄?00瀛楄妭
}

銆銆銆銆銆紺轟緥3.3錛坆錛?鏁扮粍閫鍖栦負鎸囬拡

銆銆4銆佹寚閽堝弬鏁版槸濡備綍浼犻掑唴瀛樼殑錛?br>
銆銆濡傛灉鍑芥暟鐨勫弬鏁版槸涓涓寚閽堬紝涓嶈鎸囨湜鐢ㄨ鎸囬拡鍘葷敵璇峰姩鎬佸唴瀛樸傜ず渚?-4-1涓紝Test鍑芥暟鐨勮鍙etMemory(str, 200)騫舵病鏈変嬌str鑾峰緱鏈熸湜鐨勫唴瀛橈紝str渚濇棫鏄疦ULL錛屼負浠涔堬紵

void GetMemory(char *p, int num)
{
銆p = (char *)malloc(sizeof(char) * num);
}
void Test(void)
{
銆char *str = NULL;
銆GetMemory(str, 100); // str 浠嶇劧涓?NULL
銆strcpy(str, "hello"); // 榪愯閿欒
}
紺轟緥4.1 璇曞浘鐢ㄦ寚閽堝弬鏁扮敵璇峰姩鎬佸唴瀛?br>
銆銆姣涚梾鍑哄湪鍑芥暟GetMemory涓傜紪璇戝櫒鎬繪槸瑕佷負鍑芥暟鐨勬瘡 涓弬鏁板埗浣滀復鏃跺壇鏈紝鎸囬拡鍙傛暟p鐨勫壇鏈槸 _p錛岀紪璇戝櫒浣?_p = p銆傚鏋滃嚱鏁頒綋鍐呯殑紼嬪簭淇敼浜哶p鐨勫唴瀹癸紝灝卞鑷村弬鏁皃鐨勫唴瀹逛綔鐩稿簲鐨勪慨鏀廣傝繖灝辨槸鎸囬拡鍙互鐢ㄤ綔杈撳嚭鍙傛暟鐨勫師鍥犮傚湪鏈緥涓紝_p鐢寵浜嗘柊鐨勫唴瀛橈紝鍙槸鎶? _p鎵鎸囩殑鍐呭瓨鍦板潃鏀瑰彉浜嗭紝浣嗘槸p涓濇鏈彉銆傛墍浠ュ嚱鏁癎etMemory騫朵笉鑳借緭鍑轟換浣曚笢瑗褲備簨瀹炰笂錛屾瘡鎵ц涓嬈etMemory灝變細娉勯湶涓鍧楀唴瀛橈紝鍥? 涓烘病鏈夌敤free閲婃斁鍐呭瓨銆?br>
銆銆濡傛灉闈炲緱瑕佺敤鎸囬拡鍙傛暟鍘葷敵璇峰唴瀛橈紝閭d箞搴旇鏀圭敤“鎸囧悜鎸囬拡鐨勬寚閽?#8221;錛岃紺轟緥4.2銆?br>
void GetMemory2(char **p, int num)
{
銆*p = (char *)malloc(sizeof(char) * num);
}
void Test2(void)
{
銆char *str = NULL;
銆GetMemory2(&str, 100); // 娉ㄦ剰鍙傛暟鏄?&str錛岃屼笉鏄痵tr
銆strcpy(str, "hello");
銆cout<< str << endl;
銆free(str);
}
紺轟緥4.2鐢ㄦ寚鍚戞寚閽堢殑鎸囬拡鐢寵鍔ㄦ佸唴瀛?br>
銆銆鐢變簬“鎸囧悜鎸囬拡鐨勬寚閽?#8221;榪欎釜姒傚康涓嶅鏄撶悊瑙o紝鎴戜滑鍙互鐢ㄥ嚱鏁拌繑鍥炲兼潵浼犻掑姩鎬佸唴瀛樸傝繖縐嶆柟娉曟洿鍔犵畝鍗曪紝瑙佺ず渚?.3銆?br>
char *GetMemory3(int num)
{
銆char *p = (char *)malloc(sizeof(char) * num);
銆return p;
}
void Test3(void)
{
銆char *str = NULL;
銆str = GetMemory3(100);
銆strcpy(str, "hello");
銆cout<< str << endl;
銆free(str);
}
紺轟緥4.3 鐢ㄥ嚱鏁拌繑鍥炲兼潵浼犻掑姩鎬佸唴瀛?br>
銆銆鐢ㄥ嚱鏁拌繑鍥炲兼潵浼犻掑姩鎬佸唴瀛樿繖縐嶆柟娉曡櫧鐒跺ソ鐢紝浣嗘槸甯稿父鏈変漢鎶妑eturn璇彞鐢ㄩ敊浜嗐傝繖閲屽己璋冧笉瑕佺敤return璇彞榪斿洖鎸囧悜“鏍堝唴瀛?#8221;鐨勬寚閽堬紝鍥犱負璇ュ唴瀛樺湪鍑芥暟緇撴潫鏃惰嚜鍔ㄦ秷浜★紝瑙佺ず渚?.4銆?br>
char *GetString(void)
{
銆char p[] = "hello world";
銆return p; // 緙栬瘧鍣ㄥ皢鎻愬嚭璀﹀憡
}
void Test4(void)
{
銆char *str = NULL;
銆str = GetString(); // str 鐨勫唴瀹規槸鍨冨溇
銆cout<< str << endl;
}
紺轟緥4.4 return璇彞榪斿洖鎸囧悜“鏍堝唴瀛?#8221;鐨勬寚閽?br>
銆銆鐢ㄨ皟璇曞櫒閫愭璺熻釜Test4錛屽彂鐜版墽琛宻tr = GetString璇彞鍚巗tr涓嶅啀鏄疦ULL鎸囬拡錛屼絾鏄痵tr鐨勫唴瀹逛笉鏄?#8220;hello world”鑰屾槸鍨冨溇銆?br>濡傛灉鎶婄ず渚?.4鏀瑰啓鎴愮ず渚?.5錛屼細鎬庝箞鏍鳳紵

char *GetString2(void)
{
銆char *p = "hello world";
銆return p;
}
void Test5(void)
{
銆char *str = NULL;
銆str = GetString2();
銆cout<< str << endl;
}
紺轟緥4.5 return璇彞榪斿洖甯擱噺瀛楃涓?br>
銆銆鍑芥暟Test5榪愯铏界劧涓嶄細鍑洪敊錛屼絾鏄嚱鏁? GetString2鐨勮璁℃蹇靛嵈鏄敊璇殑銆傚洜涓篏etString2鍐呯殑“hello world”鏄父閲忓瓧絎︿覆錛屼綅浜庨潤鎬佸瓨鍌ㄥ尯錛屽畠鍦ㄧ▼搴忕敓鍛芥湡鍐呮亽瀹氫笉鍙樸傛棤璁轟粈涔堟椂鍊欒皟鐢℅etString2錛屽畠榪斿洖鐨勫緇堟槸鍚屼竴涓?#8220;鍙”鐨勫唴瀛樺潡銆?br>
銆銆5銆佹潨緇?#8220;閲庢寚閽?#8221;

銆銆“閲庢寚閽?#8221;涓嶆槸NULL鎸囬拡錛屾槸鎸囧悜“鍨冨溇”鍐呭瓨鐨勬寚閽堛備漢浠竴鑸笉浼氶敊鐢∟ULL鎸囬拡錛屽洜涓虹敤if璇彞寰堝鏄撳垽鏂備絾鏄?#8220;閲庢寚閽?#8221;鏄緢鍗遍櫓鐨勶紝if璇彞瀵瑰畠涓嶈搗浣滅敤銆?“閲庢寚閽?#8221;鐨勬垚鍥犱富瑕佹湁涓ょ錛?br>
銆銆錛?錛夋寚閽堝彉閲忔病鏈夎鍒濆鍖栥備換浣曟寚閽堝彉閲忓垰琚垱寤烘椂涓嶄細鑷姩鎴愪負NULL鎸囬拡錛屽畠鐨勭己鐪佸兼槸闅忔満鐨勶紝瀹冧細涔辨寚涓姘斻傛墍浠ワ紝鎸囬拡鍙橀噺鍦ㄥ垱寤虹殑鍚屾椂搴斿綋琚垵濮嬪寲錛岃涔堝皢鎸囬拡璁劇疆涓篘ULL錛岃涔堣瀹冩寚鍚戝悎娉曠殑鍐呭瓨銆備緥濡?br>
char *p = NULL;
char *str = (char *) malloc(100);

銆銆錛?錛夋寚閽坧琚玣ree鎴栬卍elete涔嬪悗錛屾病鏈夌疆涓篘ULL錛岃浜鴻浠ヤ負p鏄釜鍚堟硶鐨勬寚閽堛?br>
銆銆錛?錛夋寚閽堟搷浣滆秴瓚婁簡鍙橀噺鐨勪綔鐢ㄨ寖鍥淬傝繖縐嶆儏鍐佃浜洪槻涓嶈儨闃詫紝紺轟緥紼嬪簭濡備笅錛?br>
class A
{
銆public:
銆銆void Func(void){ cout << “Func of class A” << endl; }
};
void Test(void)
{
銆A *p;
銆{
銆銆A a;
銆銆p = &a; // 娉ㄦ剰 a 鐨勭敓鍛芥湡
銆}
銆p->Func(); // p鏄?#8220;閲庢寚閽?#8221;
}


銆銆鍑芥暟Test鍦ㄦ墽琛岃鍙->Func()鏃訛紝瀵硅薄a宸茬粡娑堝け錛岃宲鏄寚鍚慳鐨勶紝鎵浠灝辨垚浜?#8220;閲庢寚閽?#8221;銆備絾濂囨殑鏄垜榪愯榪欎釜紼嬪簭鏃跺眳鐒舵病鏈夊嚭閿欙紝榪欏彲鑳戒笌緙栬瘧鍣ㄦ湁鍏熾?/p>

銆銆6銆佹湁浜唌alloc/free涓轟粈涔堣繕瑕乶ew/delete錛?br>
銆銆malloc涓巉ree鏄疌++/C璇█鐨勬爣鍑嗗簱鍑芥暟錛宯ew/delete鏄疌++鐨勮繍綆楃銆傚畠浠兘鍙敤浜庣敵璇峰姩鎬佸唴瀛樺拰閲婃斁鍐呭瓨銆?br>
瀵逛簬闈炲唴閮ㄦ暟鎹被鍨嬬殑瀵硅薄鑰岃█錛屽厜鐢╩aloc/free鏃犳硶婊¤凍鍔ㄦ佸璞$殑瑕佹眰銆傚璞″湪鍒涘緩鐨勫悓鏃惰鑷姩鎵ц鏋勯犲嚱鏁幫紝瀵硅薄鍦ㄦ秷浜′箣鍓嶈鑷姩鎵ц鏋愭瀯 鍑芥暟銆傜敱浜巑alloc/free鏄簱鍑芥暟鑰屼笉鏄繍綆楃錛屼笉鍦ㄧ紪璇戝櫒鎺у埗鏉冮檺涔嬪唴錛屼笉鑳藉鎶婃墽琛屾瀯閫犲嚱鏁板拰鏋愭瀯鍑芥暟鐨勪換鍔″己鍔犱簬malloc/free銆?br>
鍥犳C++璇█闇瑕佷竴涓兘瀹屾垚鍔ㄦ佸唴瀛樺垎閰嶅拰鍒濆鍖栧伐浣滅殑榪愮畻絎ew錛屼互鍙婁竴涓兘瀹屾垚娓呯悊涓庨噴鏀懼唴瀛樺伐浣滅殑榪愮畻絎elete銆傛敞鎰? new/delete涓嶆槸搴撳嚱鏁般傛垜浠厛鐪嬩竴鐪媘alloc/free鍜宯ew/delete濡備綍瀹炵幇瀵硅薄鐨勫姩鎬佸唴瀛樼鐞嗭紝瑙佺ず渚?銆?br>

class Obj
{
銆public :
銆銆Obj(void){ cout << “Initialization” << endl; }
銆銆~Obj(void){ cout << “Destroy” << endl; }
銆銆void Initialize(void){ cout << “Initialization” << endl; }
銆銆void Destroy(void){ cout << “Destroy” << endl; }
};
void UseMallocFree(void)
{
銆Obj *a = (obj *)malloc(sizeof(obj)); // 鐢寵鍔ㄦ佸唴瀛?br>銆a->Initialize(); // 鍒濆鍖?br>銆//…
銆a->Destroy(); // 娓呴櫎宸ヤ綔
銆free(a); // 閲婃斁鍐呭瓨
}
void UseNewDelete(void)
{
銆Obj *a = new Obj; // 鐢寵鍔ㄦ佸唴瀛樺茍涓斿垵濮嬪寲
銆//…
銆delete a; // 娓呴櫎騫朵笖閲婃斁鍐呭瓨
}
紺轟緥6 鐢╩alloc/free鍜宯ew/delete濡備綍瀹炵幇瀵硅薄鐨勫姩鎬佸唴瀛樼鐞?br>
銆銆綾籓bj鐨勫嚱鏁? Initialize妯℃嫙浜嗘瀯閫犲嚱鏁扮殑鍔熻兘錛屽嚱鏁癉estroy妯℃嫙浜嗘瀽鏋勫嚱鏁扮殑鍔熻兘銆傚嚱鏁癠seMallocFree涓紝鐢變簬malloc/free涓? 鑳芥墽琛屾瀯閫犲嚱鏁頒笌鏋愭瀯鍑芥暟錛屽繀欏昏皟鐢ㄦ垚鍛樺嚱鏁癐nitialize鍜孌estroy鏉ュ畬鎴愬垵濮嬪寲涓庢竻闄ゅ伐浣溿傚嚱鏁癠seNewDelete鍒欑畝鍗曞緱澶氥?br>
銆銆鎵浠ユ垜浠笉瑕佷紒鍥劇敤malloc/free鏉ュ畬鎴愬姩鎬佸璞$殑鍐呭瓨綆$悊錛屽簲璇ョ敤new/delete銆傜敱浜庡唴閮ㄦ暟鎹被鍨嬬殑“瀵硅薄”娌℃湁鏋勯犱笌鏋愭瀯鐨勮繃紼嬶紝瀵瑰畠浠岃█malloc/free鍜宯ew/delete鏄瓑浠風殑銆?br>
銆銆鏃㈢劧new/delete鐨勫姛鑳藉畬鍏ㄨ鐩栦簡malloc/free錛屼負浠涔圕++涓嶆妸malloc/free娣樻卑鍑哄眬鍛紵榪欐槸鍥犱負C++紼嬪簭緇忓父瑕佽皟鐢–鍑芥暟錛岃孋紼嬪簭鍙兘鐢╩alloc/free綆$悊鍔ㄦ佸唴瀛樸?br>
濡傛灉鐢╢ree閲婃斁“new鍒涘緩鐨勫姩鎬佸璞?#8221;錛岄偅涔堣瀵硅薄鍥犳棤娉曟墽琛屾瀽鏋勫嚱鏁拌屽彲鑳藉鑷寸▼搴忓嚭閿欍傚鏋滅敤delete閲婃斁“malloc鐢寵鐨勫姩鎬佸唴瀛? ”錛岀悊璁轟笂璁茬▼搴忎笉浼氬嚭閿欙紝浣嗘槸璇ョ▼搴忕殑鍙鎬у緢宸傛墍浠ew/delete蹇呴』閰嶅浣跨敤錛宮alloc/free涔熶竴鏍楓?br>
銆銆7銆佸唴瀛樿楀敖鎬庝箞鍔烇紵

銆銆濡傛灉鍦ㄧ敵璇峰姩鎬佸唴瀛樻椂鎵句笉鍒拌凍澶熷ぇ鐨勫唴瀛樺潡錛宮alloc鍜宯ew灝嗚繑鍥濶ULL鎸囬拡錛屽鍛婂唴瀛樼敵璇峰け璐ャ傞氬父鏈変笁縐嶆柟寮忓鐞?#8220;鍐呭瓨鑰楀敖”闂銆?br>
銆銆錛?錛夊垽鏂寚閽堟槸鍚︿負NULL錛屽鏋滄槸鍒欓┈涓婄敤return璇彞緇堟鏈嚱鏁般備緥濡傦細

void Func(void)
{
銆A *a = new A;
銆if(a == NULL)
銆{
銆銆return;
銆}
銆…
}

銆銆錛?錛夊垽鏂寚閽堟槸鍚︿負NULL錛屽鏋滄槸鍒欓┈涓婄敤exit(1)緇堟鏁翠釜紼嬪簭鐨勮繍琛屻備緥濡傦細

void Func(void)
{
銆A *a = new A;
銆if(a == NULL)
銆{
銆銆cout << “Memory Exhausted” << endl;
銆銆exit(1);
銆}
銆…
}

銆銆錛?錛変負new鍜宮alloc璁劇疆寮傚父澶勭悊鍑芥暟銆備緥濡俈isual C++鍙互鐢╛set_new_hander鍑芥暟涓簄ew璁劇疆鐢ㄦ埛鑷繁瀹氫箟鐨勫紓甯稿鐞嗗嚱鏁幫紝涔熷彲浠ヨmalloc浜敤涓巒ew鐩稿悓鐨勫紓甯稿鐞嗗嚱鏁般傝緇嗗唴瀹硅鍙傝僀++浣跨敤鎵嬪唽銆?br>
銆銆涓婅堪錛?錛夛紙2錛夋柟寮忎嬌鐢ㄦ渶鏅亶銆傚鏋滀竴涓嚱鏁板唴鏈夊澶勯渶瑕佺敵璇峰姩鎬佸唴瀛橈紝閭d箞鏂瑰紡錛?錛夊氨鏄懼緱鍔涗笉浠庡績錛堥噴鏀懼唴瀛樺緢楹葷儲錛夛紝搴旇鐢ㄦ柟寮忥紙2錛夋潵澶勭悊銆?br>
銆銆寰堝浜轟笉蹇嶅績鐢╡xit(1)錛岄棶錛?#8220;涓嶇紪鍐欏嚭閿欏鐞嗙▼搴忥紝璁╂搷浣滅郴緇熻嚜宸辮В鍐寵涓嶈錛?#8221;

銆銆涓嶈銆傚鏋滃彂鐢?#8220;鍐呭瓨鑰楀敖”榪欐牱鐨勪簨鎯咃紝涓鑸鏉ュ簲鐢ㄧ▼搴忓凡緇忔棤鑽彲鏁戙傚鏋滀笉鐢╡xit(1) 鎶婂潖紼嬪簭鏉姝伙紝瀹冨彲鑳戒細瀹蟲鎿嶄綔緋葷粺銆傞亾鐞嗗鍚岋細濡傛灉涓嶆妸姝瑰緬鍑繪瘷錛屾寰掑湪鑰佹涔嬪墠浼氱姱涓嬫洿澶氱殑緗?br>
鏈変竴涓緢閲嶈鐨勭幇璞¤鍛婅瘔澶у銆傚浜?2浣嶄互涓婄殑搴旂敤紼嬪簭鑰岃█錛屾棤璁烘庢牱浣跨敤malloc涓巒ew錛屽嚑涔庝笉鍙兘瀵艱嚧“鍐呭瓨鑰楀敖”銆傛垜鍦╓indows 98涓嬬敤Visual C++緙栧啓浜嗘祴璇曠▼搴忥紝瑙佺ず渚?銆傝繖涓▼搴忎細鏃犱紤姝㈠湴榪愯涓嬪幓錛屾牴鏈笉浼氱粓姝€傚洜涓?2浣嶆搷浣滅郴緇熸敮鎸?#8220;铏氬瓨”錛屽唴瀛樼敤瀹屼簡錛岃嚜鍔ㄧ敤紜洏絀洪棿欏舵浛銆傛垜鍙惉 鍒扮‖鐩樺槑鍚卞槑鍚卞湴鍝嶏紝Window 98宸茬粡绱緱瀵歸敭鐩樸侀紶鏍囨鏃犲弽搴斻?br>
銆銆鎴戝彲浠ュ緱鍑鴻繖涔堜竴涓粨璁猴細瀵逛簬32浣嶄互涓婄殑搴旂敤紼嬪簭錛?#8220;鍐呭瓨鑰楀敖”閿欒澶勭悊紼嬪簭姣棤鐢ㄥ銆傝繖涓嬪彲鎶奤nix鍜學indows紼嬪簭鍛樹滑涔愬潖浜嗭細鍙嶆閿欒澶勭悊紼嬪簭涓嶈搗浣滅敤錛屾垜灝變笉鍐欎簡錛岀渷浜嗗緢澶氶夯鐑︺?br>
銆銆鎴戜笉鎯寵瀵艱鑰咃紝蹇呴』寮鴻皟錛氫笉鍔犻敊璇鐞嗗皢瀵艱嚧紼嬪簭鐨勮川閲忓緢宸紝鍗冧竾涓嶅彲鍥犲皬澶卞ぇ銆?br>
void main(void)
{
銆float *p = NULL;
銆while(TRUE)
銆{
銆銆p = new float[1000000];
銆銆cout << “eat memory” << endl;
銆銆if(p==NULL)
銆銆銆exit(1);
銆}
}


銆銆紺轟緥7璇曞浘鑰楀敖鎿嶄綔緋葷粺鐨勫唴瀛?/p>

銆銆8銆乵alloc/free 鐨勪嬌鐢ㄨ鐐?br>
銆銆鍑芥暟malloc鐨勫師鍨嬪涓嬶細

void * malloc(size_t size);

銆銆鐢╩alloc鐢寵涓鍧楅暱搴︿負length鐨勬暣鏁扮被鍨嬬殑鍐呭瓨錛岀▼搴忓涓嬶細

int *p = (int *) malloc(sizeof(int) * length);

銆銆鎴戜滑搴斿綋鎶婃敞鎰忓姏闆嗕腑鍦ㄤ袱涓绱犱笂錛?#8220;綾誨瀷杞崲”鍜?#8220;sizeof”銆?br>
銆銆* malloc榪斿洖鍊肩殑綾誨瀷鏄痸oid *錛屾墍浠ュ湪璋冪敤malloc鏃惰鏄懼紡鍦拌繘琛岀被鍨嬭漿鎹紝灝唙oid * 杞崲鎴愭墍闇瑕佺殑鎸囬拡綾誨瀷銆?br>
* malloc鍑芥暟鏈韓騫朵笉璇嗗埆瑕佺敵璇風殑鍐呭瓨鏄粈涔堢被鍨嬶紝瀹冨彧鍏沖績鍐呭瓨鐨勬誨瓧鑺傛暟銆傛垜浠氬父璁頒笉浣廼nt, float絳夋暟鎹被鍨嬬殑鍙橀噺鐨勭‘鍒囧瓧鑺傛暟銆備緥濡俰nt鍙橀噺鍦?6浣嶇郴緇熶笅鏄?涓瓧鑺傦紝鍦?2浣嶄笅鏄?涓瓧鑺傦紱鑰宖loat鍙橀噺鍦?6浣嶇郴緇熶笅鏄?涓瓧鑺傦紝 鍦?2浣嶄笅涔熸槸4涓瓧鑺傘傛渶濂界敤浠ヤ笅紼嬪簭浣滀竴嬈℃祴璇曪細

cout << sizeof(char) << endl;
cout << sizeof(int) << endl;
cout << sizeof(unsigned int) << endl;
cout << sizeof(long) << endl;
cout << sizeof(unsigned long) << endl;
cout << sizeof(float) << endl;
cout << sizeof(double) << endl;
cout << sizeof(void *) << endl;

銆銆鍦╩alloc鐨?#8220;()”涓嬌鐢╯izeof榪愮畻絎︽槸鑹ソ鐨勯鏍鹼紝浣嗚褰撳績鏈夋椂鎴戜滑浼氭槒浜嗗ご錛屽啓鍑?p = malloc(sizeof(p))榪欐牱鐨勭▼搴忔潵銆?br>
銆銆* 鍑芥暟free鐨勫師鍨嬪涓嬶細

void free( void * memblock );

銆銆涓轟粈涔坒ree鍑芥暟涓嶈薄malloc鍑芥暟閭f牱澶嶆潅鍛紵榪欐槸鍥犱負鎸囬拡p鐨勭被鍨嬩互鍙婂畠鎵鎸囩殑鍐呭瓨鐨勫閲忎簨鍏堥兘鏄煡閬撶殑錛岃鍙ree(p)鑳芥紜? 鍦伴噴鏀懼唴瀛樸傚鏋減鏄疦ULL鎸囬拡錛岄偅涔坒ree瀵筽鏃犺鎿嶄綔澶氬皯嬈¢兘涓嶄細鍑洪棶棰樸傚鏋減涓嶆槸NULL鎸囬拡錛岄偅涔坒ree瀵筽榪炵畫鎿嶄綔涓ゆ灝變細瀵艱嚧紼嬪簭榪? 琛岄敊璇?br>
銆銆9銆乶ew/delete 鐨勪嬌鐢ㄨ鐐?/strong>

銆銆榪愮畻絎ew浣跨敤璧鋒潵瑕佹瘮鍑芥暟malloc綆鍗曞緱澶氾紝渚嬪錛?br>
int *p1 = (int *)malloc(sizeof(int) * length);
int *p2 = new int[length];

銆銆榪欐槸鍥犱負new鍐呯疆浜唖izeof銆佺被鍨嬭漿鎹㈠拰綾誨瀷瀹夊叏媯鏌ュ姛鑳姐傚浜庨潪鍐呴儴鏁版嵁綾誨瀷鐨勫璞¤岃█錛宯ew鍦ㄥ垱寤哄姩鎬佸璞$殑鍚屾椂瀹屾垚浜嗗垵濮嬪寲宸ヤ綔銆傚鏋滃璞℃湁澶氫釜鏋勯犲嚱鏁幫紝閭d箞new鐨勮鍙ヤ篃鍙互鏈夊縐嶅艦寮忋備緥濡?br>
class Obj
{
銆public :
銆銆Obj(void); // 鏃犲弬鏁扮殑鏋勯犲嚱鏁?br>銆銆Obj(int x); // 甯︿竴涓弬鏁扮殑鏋勯犲嚱鏁?br>銆銆…
}
void Test(void)
{
銆Obj *a = new Obj;
銆Obj *b = new Obj(1); // 鍒濆間負1
銆…
銆delete a;
銆delete b;
}

銆銆濡傛灉鐢╪ew鍒涘緩瀵硅薄鏁扮粍錛岄偅涔堝彧鑳戒嬌鐢ㄥ璞$殑鏃犲弬鏁版瀯閫犲嚱鏁般備緥濡?br>
Obj *objects = new Obj[100]; // 鍒涘緩100涓姩鎬佸璞?/td>

銆銆涓嶈兘鍐欐垚

Obj *objects = new Obj[100](1);// 鍒涘緩100涓姩鎬佸璞$殑鍚屾椂璧嬪垵鍊?

銆銆鍦ㄧ敤delete閲婃斁瀵硅薄鏁扮粍鏃訛紝鐣欐剰涓嶈涓簡絎﹀彿‘[]’銆備緥濡?br>
delete []objects; // 姝g‘鐨勭敤娉?br>delete objects; // 閿欒鐨勭敤娉?/td>

銆銆鍚庤呯浉褰撲簬delete objects[0]錛屾紡鎺変簡鍙﹀99涓璞°?br>
銆銆10銆佷竴浜涘績寰椾綋浼?/strong>

鎴戣璇嗕笉灝戞妧鏈笉閿欑殑C++/C紼嬪簭鍛橈紝寰堝皯鏈変漢鑳芥媿鎷嶈兏鑴閫氭檽鎸囬拡涓庡唴瀛樼鐞嗭紙鍖呮嫭鎴戣嚜宸憋級銆傛垜鏈鍒濆涔燙璇█鏃剁壒鍒曟寚閽堬紝瀵艱嚧鎴戝紑鍙戠涓涓簲鐢? 杞歡錛堢害1涓囪C浠g爜錛夋椂娌℃湁浣跨敤涓涓寚閽堬紝鍏ㄧ敤鏁扮粍鏉ラ《鏇挎寚閽堬紝瀹炲湪锠㈢寰楄繃鍒嗐傝翰閬挎寚閽堜笉鏄姙娉曪紝鍚庢潵鎴戞敼鍐欎簡榪欎釜杞歡錛屼唬鐮侀噺緙╁皬鍒板師鍏堢殑涓鍗娿?br>
銆銆鎴戠殑緇忛獙鏁欒鏄細

銆銆錛?錛夎秺鏄曟寚閽堬紝灝辮秺瑕佷嬌鐢ㄦ寚閽堛備笉浼氭紜嬌鐢ㄦ寚閽堬紝鑲畾綆椾笉涓婃槸鍚堟牸鐨勭▼搴忓憳銆?br>
銆銆錛?錛夊繀欏誨吇鎴?#8220;浣跨敤璋冭瘯鍣ㄩ愭璺熻釜紼嬪簭”鐨勪範鎯紝鍙湁榪欐牱鎵嶈兘鍙戠幇闂鐨勬湰璐ㄣ?img src ="http://www.shnenglu.com/hyjune/aggbug/50762.html" width = "1" height = "1" />

]]>
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