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鍔?鑳? 灝唖鎵鎸囧悜鐨勬煇涓鍧楀唴瀛樹腑鐨勬瘡涓瓧鑺傜殑鍐呭鍏ㄩ儴璁劇疆涓篶h鎸囧畾鐨凙SCII鍊?
鍧楃殑澶у皬鐢辯涓変釜鍙傛暟鎸囧畾,榪欎釜鍑芥暟閫氬父涓烘柊鐢寵鐨勫唴瀛樺仛鍒濆鍖栧伐浣?br />
鐢?娉? void *memset(void *s, char ch, unsigned n);
紼嬪簭渚?
#include <string.h>
#include <stdio.h>
#include <mem.h>
int main(void)
{
char buffer[] = "Hello world\n";
printf("Buffer before memset: %s\n", buffer);
memset(buffer, '*', strlen(buffer) );
printf("Buffer after memset: %s\n", buffer);
return 0;
}
杈撳嚭緇撴灉錛?br />
Buffer before memset: Hello world
Buffer after memset: ***********
緙栬瘧騫沖彴錛?br />
Microsoft Visual C++ 6.0
涔熶笉涓瀹氬氨鏄妸鍐呭鍏ㄩ儴璁劇疆涓篶h鎸囧畾鐨凙SCII鍊鹼紝鑰屼笖璇ュ鐨刢h鍙負(fù)int鎴栬呭叾浠栫被鍨嬶紝騫朵笉涓瀹氳鏄痗har綾誨瀷銆備緥濡備笅闈㈣繖鏍鳳細(xì)
int array[5] = {1,4,3,5,2};
for(int i = 0; i < 5; i++)
cout<<array<<" ";
cout<<endl;
memset(array,0,5*sizeof(int));
for(int k = 0; k < 5; k++)
cout<<array[k]<<" ";
cout<<endl;
杈撳嚭鐨勭粨鏋滃氨鏄細(xì)1 4 3 5 2
0 0 0 0 0
鍚庨潰鐨勮〃澶у皬鐨勫弬鏁版槸浠ュ瓧鑺備負(fù)鍗曚綅錛屾墍浠ワ紝瀵逛簬int鎴栧叾浠栫殑灝卞茍涓嶆槸閮戒箻榛樿鐨?錛堝瓧絎﹀瀷錛変簡(jiǎn)銆傝屼笖涓嶅悓鐨勬満鍣ㄤ笂int鐨勫ぇ灝忎篃鍙兘涓嶅悓錛屾墍浠ユ渶濂界敤sizeof錛堬級(jí)銆?
瑕佹敞鎰忕殑鏄紝memset鏄瀛楄妭榪涜鎿嶄綔錛屾墍浠ヤ笂榪扮▼搴忓鏋滄敼涓?br />
int array[5] = {1,4,3,5,2};
for(int i = 0; i < 5; i++)
cout<<array<<" ";
cout<<endl;
memset(array,1,5*sizeof(int));// 娉ㄦ剰 榪欓噷涓庝笂闈㈢殑紼嬪簭涓嶅悓
for(int k = 0; k < 5; k++)
cout<<array[k]<<" ";
cout<<endl;
杈撳嚭鐨勭粨鏋滃氨鏄細(xì)1 4 3 5 2
16843009 16843009 16843009 16843009 16843009
涓轟粈涔堝憿錛?br />
鍥犱負(fù)memset鏄互瀛楄妭涓哄崟浣嶅氨鏄array鎸囧悜鐨勫唴瀛樼殑5涓瓧鑺傝繘琛岃祴 鍊鹼紝姣忎釜閮界敤ASCII涓?鐨勫瓧絎﹀幓濉厖錛岃漿涓轟簩榪涘埗鍚庯紝1灝辨槸00000001,鍗犱竴涓瓧鑺傘備竴涓狪NT鍏冪礌鏄?瀛楄妭錛屽悎涓璧峰氨鏄?1000000010000000100000001錛屽氨絳変簬16843009錛屽氨瀹屾垚浜?jiǎn)瀵逛竴涓狪NT鍏冪礌鐨勮祴鍊間簡(jiǎn)銆?br />
鎵浠ョ敤memset瀵歸潪瀛楃鍨嬫暟緇勮祴鍒濆兼槸涓嶅彲鍙栫殑錛?br />
妤間笂璇寸殑寰堝錛屽彧鏄▼搴忔墽琛岀粨鏋滄槸0 0 0 0錛涚▼搴忎笉鍚岀殑鍦版柟涓嶅湪閭i噷銆傜▼搴忓涓嬶細(xì)
int array[5] = {1,4,3,5,2};
for(int i = 0; i < 5; i++)
cout<<array<<" ";
cout<<endl;
memset(array,1,5*sizeof(int)); //榪欓噷鎵嶆槸涓嶅悓鐨勫湴鏂?br />
for(int k = 0; k < 5; k++) //涓嶅悓涓嶅湪榪欓噷錛宬=1鍙槸灝戝驚鐜簡(jiǎn)涓嬈¤屽凡
cout<<array[k]<<" ";
cout<<endl;
渚嬪鏈変竴涓粨鏋勪綋Some x錛屽彲浠ヨ繖鏍鋒竻闆訛細(xì)
memset( &x, 0, sizeof(Some) );
濡傛灉鏄竴涓粨鏋勪綋鐨勬暟緇凷ome x[10]錛屽彲浠ヨ繖鏍鳳細(xì)
menset( x, 0, sizeof(Some)*10 );
memset鍑芥暟璇︾粏璇存槑
1銆倂oid *memset(void *s,int c,size_t n)
鎬葷殑浣滅敤錛氬皢宸插紑杈熷唴瀛樼┖闂?s 鐨勯 n 涓瓧鑺傜殑鍊艱涓哄?c銆?br />
2銆備緥瀛?br />
main(){
char *s="Golden Global View";
clrscr();
memset(s,'G',6);//璨屼技榪欓噷鏈夌偣闂//
printf("%s",s);
getchar();
return 0;
}銆
銆愯繖涓棶棰樼浉褰撳ぇ錛岀▼搴忔牴鏈氨榪愯涓嶄笅鍘諱簡(jiǎn)錛屼綘榪欓噷鐨凷蹇楀悜鐨勬槸涓孌靛彧璇葷殑鍐呭瓨錛岃屼綘memset鍙堣瘯鍥句慨鏀瑰畠錛屾墍浠ヨ繍琛屾椂瑕佸嚭閿欙紝淇敼鍔炴硶char *s淇敼涓篶har s[]銆?br />
3銆俶emset() 鍑芥暟甯哥敤浜庡唴瀛樼┖闂村垵濮嬪寲銆傚錛?br />
char str[100];
memset(str,0,100);
4銆俶emset()鐨勬繁鍒誨唴娑碉細(xì)鐢ㄦ潵瀵逛竴孌靛唴瀛樼┖闂村叏閮ㄨ緗負(fù)鏌愪釜瀛楃錛屼竴鑸敤鍦ㄥ瀹氫箟鐨勫瓧絎︿覆榪涜鍒濆鍖栦負(fù)‘memset(a, '\0', sizeof(a));
memcpy鐢ㄦ潵鍋氬唴瀛樻嫹璐濓紝浣犲彲浠ユ嬁瀹冩嫹璐濅換浣曟暟鎹被鍨嬬殑瀵硅薄錛屽彲浠ユ寚瀹氭嫹璐濈殑鏁版嵁闀垮害錛涗緥錛歝har a[100],b[50]; memcpy(b, a, sizeof(b));娉ㄦ剰濡傜敤sizeof(a)錛屼細(xì)閫犳垚b鐨勫唴瀛樺湴鍧婧㈠嚭銆?br />
strcpy灝卞彧鑳芥嫹璐濆瓧絎︿覆浜?jiǎn)锛屽畠閬囧?\0'灝辯粨鏉熸嫹璐濓紱渚嬶細(xì)char a[100],b[50];strcpy(a,b);濡傜敤strcpy(b,a)錛岃娉ㄦ剰a涓殑瀛楃涓查暱搴︼紙絎竴涓?#8216;\0’涔嬪墠錛夋槸鍚﹁秴榪?0浣嶏紝濡傝秴榪囷紝鍒欎細(xì)閫犳垚b鐨勫唴瀛樺湴鍧婧㈠嚭銆?br />
5.琛ュ厖錛氭煇浜虹殑涓鐐瑰績(jī)寰?br />
memset鍙互鏂逛究鐨勬竻絀轟竴涓粨鏋勭被鍨嬬殑鍙橀噺鎴栨暟緇勩?br />
濡傦細(xì)
struct sample_struct
{
char csName[16];
int iSeq;
int iType;
};
瀵逛簬鍙橀噺
struct sample_strcut stTest;
涓鑸儏鍐典笅錛屾竻絀簊tTest鐨勬柟娉曪細(xì)
stTest.csName[0]='\0';
stTest.iSeq=0;
stTest.iType=0;
鐢╩emset灝遍潪甯告柟渚匡細(xì)
memset(&stTest,0,sizeof(struct sample_struct));
濡傛灉鏄暟緇勶細(xì)
struct sample_struct TEST[10];
鍒?br />
memset(TEST,0,sizeof(struct sample_struct)*10);
6銆俿trcpy
鍘熷瀷錛歟xtern char *strcpy(char *dest,char *src);
鐢ㄦ硶錛氾純i nclude
鍔熻兘錛氭妸src鎵鎸囩敱NULL緇撴潫鐨勫瓧絎︿覆澶嶅埗鍒癲est鎵鎸囩殑鏁扮粍涓?br />
璇存槑錛歴rc鍜宒est鎵鎸囧唴瀛樺尯鍩熶笉鍙互閲嶅彔涓攄est蹇呴』鏈夎凍澶熺殑絀洪棿鏉ュ綰硈rc鐨勫瓧絎︿覆銆?br />
榪斿洖鎸囧悜dest鐨勬寚閽堛?br />
memcpy
鍘熷瀷錛歟xtern void *memcpy(void *dest, void *src, unsigned int count);
鐢ㄦ硶錛氾純i nclude
鍔熻兘錛氱敱src鎵鎸囧唴瀛樺尯鍩熷鍒禼ount涓瓧鑺傚埌dest鎵鎸囧唴瀛樺尯鍩熴?br />
璇存槑錛歴rc鍜宒est鎵鎸囧唴瀛樺尯鍩熶笉鑳介噸鍙狅紝鍑芥暟榪斿洖鎸囧悜dest鐨勬寚閽堛?br />
memset
鍘熷瀷錛歟xtern void *memset(void *buffer, int c, int count);
鐢ㄦ硶錛氾純i nclude
鍔熻兘錛氭妸buffer鎵鎸囧唴瀛樺尯鍩熺殑鍓峜ount涓瓧鑺傝緗垚瀛楃c銆?br />
璇存槑錛氳繑鍥炴寚鍚慴uffer鐨勬寚閽堛?br />
鍘熸枃閾炬帴錛歨ttp://baike.baidu.com/view/982208.htm
<====================================================================================================>
1銆倂oid *memset(void *s,int c,size_t n)
鎬葷殑浣滅敤錛氬皢宸插紑杈熷唴瀛樼┖闂?s 鐨勯 n 涓瓧鑺傜殑鍊艱涓哄?c銆?br />
2銆備緥瀛?br />
main(){
char *s="Golden Global View";
clrscr();
memset(s,'G',6);//璨屼技榪欓噷鏈夌偣闂//
printf("%s",s);
getchar();
return 0;
}銆
3銆俶emset() 鍑芥暟甯哥敤浜庡唴瀛樼┖闂村垵濮嬪寲銆傚錛?br />
char str[100];
memset(str,0,100);
4銆俶emset()鐨勬繁鍒誨唴娑碉細(xì)鐢ㄦ潵瀵逛竴孌靛唴瀛樼┖闂村叏閮ㄨ緗負(fù)鏌愪釜瀛楃錛屼竴鑸敤鍦ㄥ瀹氫箟鐨勫瓧絎︿覆榪涜鍒濆鍖栦負(fù)‘memset(a, '\0', sizeof(a));
memcpy鐢ㄦ潵鍋氬唴瀛樻嫹璐濓紝浣犲彲浠ユ嬁瀹冩嫹璐濅換浣曟暟鎹被鍨嬬殑瀵硅薄錛屽彲浠ユ寚瀹氭嫹璐濈殑鏁版嵁闀垮害錛涗緥錛歝har a[100],b[50]; memcpy(b, a, sizeof(b));娉ㄦ剰濡傜敤sizeof(a)錛屼細(xì)閫犳垚b鐨勫唴瀛樺湴鍧婧㈠嚭銆?br />
strcpy灝卞彧鑳芥嫹璐濆瓧絎︿覆浜?jiǎn)锛屽畠閬囧?\0'灝辯粨鏉熸嫹璐濓紱渚嬶細(xì)char a[100],b[50];strcpy(a,b);濡傜敤strcpy(b,a)錛岃娉ㄦ剰a涓殑瀛楃涓查暱搴︼紙絎竴涓?#8216;\0’涔嬪墠錛夋槸鍚﹁秴榪?0浣嶏紝濡傝秴榪囷紝鍒欎細(xì)閫犳垚b鐨勫唴瀛樺湴鍧婧㈠嚭銆?br />
5.琛ュ厖錛氭煇浜虹殑涓鐐瑰績(jī)寰?br />
memset鍙互鏂逛究鐨勬竻絀轟竴涓粨鏋勭被鍨嬬殑鍙橀噺鎴栨暟緇勩?br />
濡傦細(xì)
struct sample_struct
{
char csName[16];
int iSeq;
int iType;
};
瀵逛簬鍙橀噺
struct sample_strcut stTest;
涓鑸儏鍐典笅錛屾竻絀簊tTest鐨勬柟娉曪細(xì)
stTest.csName[0]='\0';
stTest.iSeq=0;
stTest.iType=0;
鐢╩emset灝遍潪甯告柟渚匡細(xì)
memset(&stTest,0,sizeof(struct sample_struct));
濡傛灉鏄暟緇勶細(xì)
struct sample_struct TEST[10];
鍒?br />
memset(TEST,0,sizeof(struct sample_struct)*10);
6銆俿trcpy
鍘熷瀷錛歟xtern char *strcpy(char *dest,char *src);
鐢ㄦ硶錛氾純i nclude
鍔熻兘錛氭妸src鎵鎸囩敱NULL緇撴潫鐨勫瓧絎︿覆澶嶅埗鍒癲est鎵鎸囩殑鏁扮粍涓?br />
璇存槑錛歴rc鍜宒est鎵鎸囧唴瀛樺尯鍩熶笉鍙互閲嶅彔涓攄est蹇呴』鏈夎凍澶熺殑絀洪棿鏉ュ綰硈rc鐨勫瓧絎︿覆銆?br />
榪斿洖鎸囧悜dest鐨勬寚閽堛?br />
memcpy
鍘熷瀷錛歟xtern void *memcpy(void *dest, void *src, unsigned int count);
鐢ㄦ硶錛氾純i nclude
鍔熻兘錛氱敱src鎵鎸囧唴瀛樺尯鍩熷鍒禼ount涓瓧鑺傚埌dest鎵鎸囧唴瀛樺尯鍩熴?br />
璇存槑錛歴rc鍜宒est鎵鎸囧唴瀛樺尯鍩熶笉鑳介噸鍙狅紝鍑芥暟榪斿洖鎸囧悜dest鐨勬寚閽堛?br />
memset
鍘熷瀷錛歟xtern void *memset(void *buffer, int c, int count);
鐢ㄦ硶錛氾純i nclude
鍔熻兘錛氭妸buffer鎵鎸囧唴瀛樺尯鍩熺殑鍓峜ount涓瓧鑺傝緗垚瀛楃c銆?br />
璇存槑錛氳繑鍥炴寚鍚慴uffer鐨勬寚閽堛?br />
鍘熸枃閾炬帴錛歨ttp://www.azure.net.ru/read.php/137.htm

]]>
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