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char st[100];
1. ×Ö·û´®³¤¶È
   strlen(st);
2. ×Ö·û´®±È½Ï
   strcmp(st1,st2);
   strncmp(st1,st2,n);   °Ñst1,st2µÄǰn¸ö½øÐбȽϡ£
3. ¸½¼Ó
   strcat(st1,st2);
   strncat(st1,st2,n);   n±íʾÁ¬½ÓÉÏst2µÄǰn¸ö¸øst1£¬ÔÚ×îºó²»Òª¼Ó'\0'¡£
4. Ìæ»»
   strcpy(st1,st2);
   strncpy(st1,st2,n); n±íʾ¸´ÖÆst2µÄǰn¸ö¸øst1£¬ÔÚ×îºóÒª¼Ó'\0'¡£
5. ²éÕÒ
   where = strchr(st,ch)   chΪҪÕÒµÄ×Ö·û¡£
   where = strspn(st1,st2); ²éÕÒ×Ö·û´®¡£
C++£º
<string>
string str;
1. ×Ö·û´®³¤¶È
   len = str.length();
   len = str.size();
2. ×Ö·û´®±È½Ï
   ¿ÉÒÔÖ±½Ó±È½Ï
   Ò²¿ÉÒÔ:
   str1.compare(str2);
   str1.compare(pos1,len1,str2,pos2,len2); ֵΪ¸º£¬0 £¬Õý¡£
   nops ³¤¶Èµ½Íê¡£
3. ¸½¼Ó
   str1 += str2;
   »ò
   str1.append(str2);
   str1.append(str2.pos2,len2);
  
4. ×Ö·û´®ÌáÈ¡
   str2 = str1.substr();
   str2 = str1.substr(pos1);
   str2 = str1.substr(pos1,len1);
5. ×Ö·û´®ËÑË÷
   where = str1.find(str2);
   where = str1.find(str2,pos1); pos1ÊÇ´Óstr1µÄµÚ¼¸Î»¿ªÊ¼¡£
   where = str1.rfind(str2); ´ÓºóÍùǰËÑ¡£
6. ²åÈë×Ö·û´®
   ²»ÊǸ³ÖµÓï¾ä¡£
   str1.insert(pos1,str2);
   str1.insert(pos1,str2,pos2,len2);
   str1.insert(pos1,numchar,char);    numcharÊDzåÈë´ÎÊý£¬charÊÇÒª²åÈëµÄ×Ö·û¡£
7. Ìæ»»×Ö·û´®
   str1.replace(pos1,str2);
   str1.replace(pos1,str2,pos2,len2);
8. ɾ³ý×Ö·û´®
   str.erase(pos,len)
   str.clear();
9. ½»»»×Ö·û´®
   swap(str1,str2);
10. C --> C++
   char *cstr = "Hello";
   string str1;
   cstr = cstr;


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