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1.涓嶈皟鐢ㄥ簱鍑芥暟錛屽疄鐜皊trcpy鍑芥暟銆?br> 2.瑙ｉ噴涓轟粈涔堣榪斿洖char *銆?br>
瑙ｈ錛?br> 1.strcpy鐨勫疄鐜頒唬鐮?br>
- char * strcpy(char * strDest,const char * strSrc)
- {
- if ((strDest==NULL)||(strSrc==NULL)) //[1]
- throw "Invalid argument(s)"; //[2]
- char * strDestCopy=strDest; //[3]
- while ((*strDest++=*strSrc++)!='\0'); //[4]
- return strDestCopy;
- }
閿欒鐨勫仛娉曪細(xì)
[1]
(A)涓嶆鏌ユ寚閽堢殑鏈夋晥鎬э紝璇存槑絳旈鑰呬笉娉ㄩ噸浠ｇ爜鐨勫仴澹с?br> (B)媯(gè)鏌ユ寚閽堢殑鏈夋晥鎬ф椂浣跨敤((!strDest)||(!strSrc))鎴?!(strDest&&strSrc))錛岃鏄庣瓟棰樿呭C璇█涓被鍨嬬殑闅愬紡杞崲娌℃湁娣卞埢璁よ瘑銆傚湪鏈緥涓璫har *杞崲涓篵ool鍗蟲(chóng)槸綾誨瀷闅愬紡杞崲錛岃繖縐嶅姛鑳借櫧鐒剁伒媧伙紝浣嗘洿澶氱殑鏄鑷村嚭閿欐鐜囧澶у拰緇存姢鎴愭湰鍗囬珮銆傛墍浠++涓撻棬澧炲姞浜?jiǎn)bool銆乼rue銆乫alse涓変釜鍏抽敭瀛椾互鎻愪緵鏇村畨鍏ㄧ殑鏉′歡琛ㄨ揪寮忋?br> (C)媯(gè)鏌ユ寚閽堢殑鏈夋晥鎬ф椂浣跨敤((strDest==0)||(strSrc==0))錛岃鏄庣瓟棰樿呬笉鐭ラ亾浣跨敤甯擱噺鐨勫ソ澶勩傜洿鎺ヤ嬌鐢ㄥ瓧闈㈠父閲忥紙濡傛湰渚嬩腑鐨?錛変細(xì)鍑忓皯紼嬪簭鐨勫彲緇存姢鎬с?铏界劧綆鍗曪紝浣嗙▼搴忎腑鍙兘鍑虹幇寰堝澶勫鎸囬拡鐨勬鏌ワ紝涓囦竴鍑虹幇絎旇錛岀紪璇戝櫒涓嶈兘鍙戠幇錛岀敓鎴愮殑紼嬪簭鍐呭惈閫昏緫閿欒錛屽緢闅炬帓闄ゃ傝屼嬌鐢∟ULL浠ｆ浛0錛屽鏋滃嚭鐜版嫾鍐欓敊璇紝緙栬瘧鍣ㄥ氨浼?xì)妫鏌ュ嚭鏉ャ?br> [2]
(A)return new string("Invalid argument(s)"
;錛岃鏄庣瓟棰樿呮牴鏈笉鐭ラ亾榪斿洖鍊肩殑鐢ㄩ旓紝騫朵笖浠栧鍐呭瓨娉勬紡涔熸病鏈夎鎯曞績(jī)銆備粠鍑芥暟涓繑鍥炲嚱鏁頒綋鍐呭垎閰嶇殑鍐呭瓨鏄崄鍒嗗嵄闄╃殑鍋氭硶錛屼粬鎶婇噴鏀懼唴瀛樼殑涔夊姟鎶涚粰涓嶇煡鎯呯殑璋冪敤鑰咃紝緇濆ぇ澶氭暟鎯呭喌涓嬶紝璋冪敤鑰呬笉浼?xì)閲婃攽謫呭瓨锛寴q欏鑷村唴瀛樻硠婕忋?br> (B)return 0;錛岃鏄庣瓟棰樿呮病鏈夋帉鎻″紓甯告満鍒躲傝皟鐢ㄨ呮湁鍙兘蹇樿媯(gè)鏌ヨ繑鍥炲鹼紝璋冪敤鑰呰繕鍙兘鏃犳硶媯(gè)鏌ヨ繑鍥炲鹼紙瑙佸悗闈㈢殑閾懼紡琛ㄨ揪寮忥級(jí)銆傚鎯寵榪斿洖鍊艱偐璐熻繑鍥炴紜煎拰寮傚父鍊肩殑鍙岄噸鍔熻兘錛屽叾緇撴灉寰(xiàn)寰(xiàn)鏄袱縐嶅姛鑳介兘澶辨晥銆傚簲璇ヤ互鎶涘嚭寮傚父鏉ヤ唬鏇胯繑鍥炲鹼紝榪欐牱鍙互鍑忚交璋冪敤鑰呯殑璐熸媴銆佷嬌閿欒涓嶄細(xì)琚拷鐣ャ佸寮虹▼搴忕殑鍙淮鎶ゆс?br> [3]
(A)蹇樿淇濆瓨鍘熷鐨剆trDest鍊鹼紝璇存槑絳旈鑰呴昏緫鎬濈淮涓嶄弗瀵嗐?br> [4]
(A)寰幆鍐欐垚while (*strDest++=*strSrc++);錛屽悓[1](B)銆?br> (B)寰幆鍐欐垚while (*strSrc!='\0') *strDest++=*strSrc++;錛岃鏄庣瓟棰樿呭杈圭晫鏉′歡鐨勬鏌ヤ笉鍔涖傚驚鐜綋緇撴潫鍚庯紝strDest瀛楃涓茬殑鏈熬娌℃湁姝ｇ‘鍦板姞涓?\0'銆?br>
2.榪斿洖strDest鐨勫師濮嬪間嬌鍑芥暟鑳藉鏀寔閾懼紡琛ㄨ揪寮忥紝澧炲姞浜?jiǎn)鍑芥暟鐨?#8220;闄勫姞鍊?#8221;銆傚悓鏍峰姛鑳界殑鍑芥暟錛屽鏋滆兘鍚堢悊鍦版彁楂樼殑鍙敤鎬э紝鑷劧灝辨洿鍔犵悊鎯熾?br> 閾懼紡琛ㄨ揪寮忕殑褰㈠紡濡傦細(xì)
int iLength=strlen(strcpy(strA,strB));
鍙堝錛?br> char * strA=strcpy(new char[10],strB);
榪斿洖strSrc鐨勫師濮嬪兼槸閿欒鐨勩傚叾涓錛屾簮瀛楃涓茶偗瀹氭槸宸茬煡鐨勶紝榪斿洖瀹冩病鏈夋剰涔夈傚叾浜岋紝涓嶈兘鏀寔褰㈠絎簩渚嬬殑琛ㄨ揪寮忋傚叾涓夛紝涓轟簡(jiǎn)淇濇姢婧愬瓧絎︿覆錛屽艦鍙傜敤const闄愬畾strSrc鎵鎸囩殑鍐呭錛屾妸const char *浣滀負(fù)char *榪斿洖錛岀被鍨嬩笉絎︼紝緙栬瘧鎶ラ敊銆?
涓婇潰鍐呭鏄漿鑷細(xì)http://bbs.chinaunix.net/viewthread.php?tid=25356
涓嬮潰鏄嚜宸辯殑涓浜涙濊冿細(xì)
鎴戞兂C/C++鎻愪緵鐨勫瓧絎︿覆鎷瘋礉鍑芥暟瀹炵幇鏂瑰紡搴旇鏄笅闈㈢殑鏂瑰紡涔嬩竴錛?br>method 1:
char * strcpy(char * strDest,const char * strSrc)
{char * strDestCopy=strDest;
while ((*strDest++=*strSrc++)!='\0'); //strDest=strDestCopy;//鎸囬拡閲嶇疆 涓嶅ソ鎰忔濓紝榪欓噷鐨勯噸緗槸澶氫綑鐨勶紝鍘熷洜鏄櫧鐒秙trDes鐨勪綅緗Щ鍔ㄤ簡(jiǎn)錛屼絾鏄繖鍙槸鍦ㄥ綋鍓嶅嚱鏁板唴鍙戠敓鍙樺寲錛?br> //鑰屽湪璋冪敤鍑芥暟鐨勫湴鏂癸紝鎸囬拡鐨勪綅緗繕鏄笉鍙樸?/span> return strDestCopy;
} char * strcpy(char * strDest,const char * strSrc) { int i=0; while ((strDest[i++]=*strSrc++)!='\0'); return strDest; } method 3:
char * strcpy(char * strDest,const char * strSrc) { int i=0; while ((strDest[i++]=strSrc[i])!='\0'); return strDest; }]]>