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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

** 2012-09-09 13:57 鍙戣〃璇勮
]]>
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