C/C++ ÅжÏ·¾¶ÎªÎļþ
	
    
    
	/***************************************************
* º¯Êý˵Ã÷: Åжϵ±Ç°path²ÎÊýÊÇ·ñΪһ¸ö¿É¶ÁµÄÎļþ
* º¯Êý·µ»Ø: 0 - Îļþ¿Ì¶È 1 - ȨÏ޾ܾø -1 -º¯Êý´íÎó
*   ²Î Êý : path Îļþ·¾¶.
***************************************************/
int isReadFile(const char *path)
{
        struct stat info;
        int euid,egid;
        if ( 0!= stat(path,&info) )
        {
                return -1;
        }
        //if it is a file
        if( S_IFREG != (info.st_mode & S_IFMT ) )
        {
                return 1;
        }
        euid=geteuid();//returns the real user ID of the 
current process
        egid=getegid();//returns the effective user ID of the 
current process
        //if effective user is root
        if(euid==0)
        {
                if(info.st_mode & S_IRUSR || info.st_mode & 
S_IRGRP ||info.st_mode & S_IROTH)
                {
                        return 0;
                }
         
    
     
	
	
    
    
	Ïà¹ØÎĵµ£º
        
    
    CRT (C run-time library)
Ò» ²úÉú
ÔËÐÐʱ¿âÊdzÌÐòÔÚÔËÐÐʱËùÐèÒªµÄ¿âÎļþ£¬Í¨³£ÒÔLIB»òDLLÐÎʽÌṩ¡£
CÔËÐÐʱ¿â¾ÍÊÇC run-time library£¬µ®ÉúÓÚ20ÊÀ¼Í70Äê´ú£¬ÊÇC¶ø·ÇC++ÓïÑÔÊÀ½çµÄ¸ÅÄC³ÌÐòÔËÐÐʱÐèÒªÕâЩ¿âÖеĺ¯Êý¡£
C ÓïÑÔÊÇËùνµÄ“СÄں˔ÓïÑÔ£¬¾ÍÆäÓïÑÔ±¾ÉíÀ´ËµºÜС£¨²»¶àµÄ¹Ø¼ü×Ö£¬³ÌÐòÁ÷³Ì¿ØÖÆ£ ......
	
    
        
    
    C++Á¬½ÓOracle
  
        ÔÚVisual C++Ï¿ª·¢Oracle¿â½Ó¿ÚÖ÷ÒªÓÐÁ½ÖÖ·½·¨¡£Ò»ÖÖ·½·¨ÊÇÀûÓÃVisual C++ÌṩµÄ¶àÖÖÊý¾Ý¿â·ÃÎʼ¼Êõ£¬È翪·ÅÊý¾Ý¿âÁ¬½ÓODBC¡¢Êý¾Ý´æÈ¡¶ÔÏóDAO¡¢¶ÔÏóÁ¬½ÓºÍǶÈëÊý¾Ý¿âOLE DBºÍActiveXÊý¾Ý¶ÔÏóADOµÈ¡£ÁíÒ»ÖÖ·½·¨ÊÇÔÚVisual C++ÖÐǶÈëSQLÓï¾ä£¬Õâ¾ÍÊÇËùÖ ......
	
    
        
    
    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&ldquo ......
	
    
        
    
    #include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
/****************************************************
* º¯Êý¹¦ÄÜ: ÅжϲÎÊý·¾¶ÊÇ·ñΪ(ÕýÈ·µÄ)Ŀ¼
* º¯Êý·µ»Ø: 0Ϊ±íʾ·¾¶ÎªÎļþ,1Ϊ·ÇĿ¼.ÆäËûΪ´íÎó
*    ²ÎÊý: pathÎļþÐèÒªÅжϵÄĿ¼µÄ·¾¶.
*  ......