Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

¡¾×ª¡¿C/C++ ±ÊÊÔ¡¢ÃæÊÔÌâÄ¿´ó»ã×Ü


1.ÇóÏÂÃæº¯ÊýµÄ·µ»ØÖµ£¨Î¢Èí£©
int func(x)
{
    int countx = 0;
    while(x)
    {
          countx ++;
          x = x&(x-1);
     }
    return countx;

¼Ù¶¨x = 9999¡£ ´ð°¸£º8
˼·£º½«xת»¯Îª2½øÖÆ£¬¿´º¬ÓеÄ1µÄ¸öÊý¡£
2. ʲôÊÇ“ÒýÓÔ£¿ÉêÃ÷ºÍʹÓÓÒýÓÔҪעÒâÄÄЩÎÊÌ⣿
´ð£ºÒýÓþÍÊÇij¸öÄ¿±ê±äÁ¿µÄ“±ðÃû”(alias)£¬¶ÔÓ¦ÓõIJÙ×÷Óë¶Ô±äÁ¿Ö±½Ó²Ù×÷Ч¹ûÍêÈ«Ïàͬ¡£ÉêÃ÷Ò»¸öÒýÓõÄʱºò£¬ÇмÇÒª¶ÔÆä½øÐгõʼ»¯¡£ÒýÓÃÉùÃ÷Íê±Ïºó£¬Ï൱ÓÚÄ¿±ê±äÁ¿ÃûÓÐÁ½¸öÃû³Æ£¬¼´¸ÃÄ¿±êÔ­Ãû³ÆºÍÒýÓÃÃû£¬²»ÄÜÔٰѸÃÒýÓÃÃû×÷ΪÆäËû±äÁ¿ÃûµÄ±ðÃû¡£ÉùÃ÷Ò»¸öÒýÓ㬲»ÊÇж¨ÒåÁËÒ»¸ö±äÁ¿£¬ËüÖ»±íʾ¸ÃÒýÓÃÃûÊÇÄ¿±ê±äÁ¿ÃûµÄÒ»¸ö±ðÃû£¬Ëü±¾Éí²»ÊÇÒ»ÖÖÊý¾ÝÀàÐÍ£¬Òò´ËÒýÓñ¾Éí²»Õ¼´æ´¢µ¥Ôª£¬ÏµÍ³Ò²²»¸øÒýÓ÷ÖÅä´æ´¢µ¥Ôª¡£²»Äܽ¨Á¢Êý×éµÄÒýÓá£
3. ½«“ÒýÓÔ×÷Ϊº¯Êý²ÎÊýÓÐÄÄÐ©ÌØµã£¿
£¨1£©´«µÝÒýÓøøº¯ÊýÓë´«µÝÖ¸ÕëµÄЧ¹ûÊÇÒ»ÑùµÄ¡£Õâʱ£¬±»µ÷º¯ÊýµÄÐβξͳÉΪԭÀ´Ö÷µ÷º¯ÊýÖеÄʵ²Î±äÁ¿»ò¶ÔÏóµÄÒ»¸ö±ðÃûÀ´Ê¹Óã¬ËùÒÔÔÚ±»µ÷º¯ÊýÖжÔÐβαäÁ¿µÄ²Ù×÷¾ÍÊÇ¶ÔÆäÏàÓ¦µÄÄ¿±ê¶ÔÏó£¨ÔÚÖ÷µ÷º¯ÊýÖУ©µÄ²Ù×÷¡£
£¨2£©Ê¹ÓÃÒýÓô«µÝº¯ÊýµÄ²ÎÊý£¬ÔÚÄÚ´æÖв¢Ã»ÓвúÉúʵ²ÎµÄ¸±±¾£¬ËüÊÇÖ±½Ó¶Ôʵ²Î²Ù×÷£»¶øÊ¹ÓÃÒ»°ã±äÁ¿´«µÝº¯ÊýµÄ²ÎÊý£¬µ±·¢Éúº¯Êýµ÷ÓÃʱ£¬ÐèÒª¸øÐβηÖÅä´æ´¢µ¥Ôª£¬ÐβαäÁ¿ÊÇʵ²Î±äÁ¿µÄ¸±±¾£»Èç¹û´«µÝµÄÊǶÔÏ󣬻¹½«µ÷Óÿ½±´¹¹Ô캯Êý¡£Òò´Ë£¬µ±²ÎÊý´«µÝµÄÊý¾Ý½Ï´óʱ£¬ÓÃÒýÓñÈÓÃÒ»°ã±äÁ¿´«µÝ²ÎÊýµÄЧÂʺÍËùÕ¼¿Õ¼ä¶¼ºÃ¡£
£¨3£©Ê¹ÓÃÖ¸Õë×÷Ϊº¯ÊýµÄ²ÎÊýËäȻҲÄÜ´ïµ½ÓëʹÓÃÒýÓõÄЧ¹û£¬µ«ÊÇ£¬ÔÚ±»µ÷º¯ÊýÖÐͬÑùÒª¸øÐβηÖÅä´æ´¢µ¥Ôª£¬ÇÒÐèÒªÖØ¸´Ê¹ÓÃ"*Ö¸Õë±äÁ¿Ãû"µÄÐÎʽ½øÐÐÔËË㣬ÕâºÜÈÝÒײúÉú´íÎóÇÒ³ÌÐòµÄÔĶÁÐԽϲÁíÒ»·½Ã棬ÔÚÖ÷µ÷º¯ÊýµÄµ÷Óõ㴦£¬±ØÐëÓñäÁ¿µÄµØÖ·×÷Ϊʵ²Î¡£¶øÒýÓøüÈÝÒ×ʹÓ㬸üÇåÎú¡£
4. ÔÚʲôʱºòÐèҪʹÓÓ³£ÒýÓÔ£¿¡¡
Èç¹û¼ÈÒªÀûÓÃÒýÓÃÌá¸ß³ÌÐòµÄЧÂÊ£¬ÓÖÒª±£»¤´«µÝ¸øº¯ÊýµÄÊý¾Ý²»ÔÚº¯ÊýÖб»¸Ä±ä£¬¾ÍӦʹÓó£ÒýÓᣳ£ÒýÓÃÉùÃ÷·½Ê½£ºconst ÀàÐͱêʶ·û &ÒýÓÃÃû=Ä¿±ê±äÁ¿Ãû£»
Àý1
int a ;
const int &ra=a;
ra=1; //´íÎó
a=1; //ÕýÈ·
Àý2
string f


Ïà¹ØÎĵµ£º

memcached Óëc/c++ÔËÓÃ

ÐÞ¸Ämakefile£¬ÔÚLIBSÀïÃæ¼ÓÉÏ-lmemcached£¬±ÈÈçÔ­À´ gcc test.c£¬ÏÖÔÚ gcc test.c -lmemcached¡£Õâ¸ö¿â¾ÍÊÇlibmemcachedÌṩµÄ¡£
È»ºóÌí¼Ó#include<libmemcached/memcached.h>£¬Õâ¸öÎļþÒ²ÊÇlibmemcachedÌṩµÄ¡£
Ö÷º¯ÊýÀïÃæÐèÒªÌí¼Ó£º
    memcached_st *memc;
    uint32_t&nbs ......

mysql connect c++

ÏÈǰÔÚ²âÊÔmysql connect c++½Ó¿ÚµÄʱºòÔËÐÐÆä¹Ù·½ÌṩµÄÀý×Ó
21.5.5.6. MySQL Connector/C++ Complete Example 2
The following code shows a complete example of how to use MySQL Connector/C++:
/* Copyright 2008 Sun Microsystems, Inc.
This program is free software; you can redistribute it and/or modify ......

C++ ²Ù×÷XMLµÄÍêÕûÀý×Ó——MSXMLƪ

д±¾ÎĵÄÄ¿µÄÊÇΪÁË·½±ã´ó¼ÒÁ˽âC++ MSXML²Ù×÷·½·¨¡£
µ±È»£¬C++ÖжÔMSXMLµÄµ÷ÓÃÓжàÖÖ£¬±¾ÎIJÉÓõķ½·¨ÊÇÍêÈ«²ÎÕÕMSXML SDKÌṩµÄÎĵµ½øÐвÙ×÷¡£
Èç¹ûÓÐʲô´íÎ󣬻¶Ó­Ö¸Õý¡£
´úÂë¿ò¼ÜÊÇ»ùÓÚvs2008 MFC ¶Ô»°¿ò³ÌÐò£¨UNICODE£©¡£¶Ô»°¿ò³ÌÐòÐèÒª¶ÁÕß×Ô¼º´´½¨¡£
#include <msxml6.h>
#include <comutil.h>
# ......

C/C++ÏÂASCIIÓëEBCDICÂëÖ®¼äµÄÇáËÉת»»

EBCDIC (Extended Binary Coded Decimal Interchange Code) À©Ôö¶þ½øÊ½Ê®½ø½»»»Â룬ΪIBMÓÚ1963Ä꣭1964Äê¼äÍÆ³öµÄ×Ö·û±àÂë±í£¬¸ù¾ÝÔçÆÚ´ò¿×»úʽµÄ¶þ½ø»¯Ê®½øÊý(BCD, Bindary Coded Decimal)ÅÅÁжø³É¡£ÊÇIBMÃÔ¶û¼¶ÒÔÉϵçÄԵıê×¼Âë¡£
ASCII£¨American Standard Code for Information Interchange£¬ÃÀ¹úÐÅÏ¢»¥»»±ê×¼´úÂë£©Ê ......

C³ÌÐòʹÓò»Í¬º¯Êýµ÷ÓÃÔ¼¶¨µ÷Óûã±à×Ó¹ý³Ì

Èç×ªÔØ£¬Çë×¢Ã÷³ö´¦£ºhttp://blog.csdn.net/zhangyang0402/archive/2010/05/01/5549266.aspx
 
¿ª·¢¹¤¾ß£ºVC ++ 6.0  MASM32
 
Ò»¡¢__cdeclµ÷Ó÷½Ê½
 
1£®  ÔÚVCÖÐн¨Win32 Console Application, TestASM
 
2£®  н¨test.c
#include<stdio.h>
extern void swap(int * ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ