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GNU C Library——×îÈ«µÄ£Ãº¯Êý˵Ã÷

ǰÌìдһ¸öС³ÌÐò, ͻȻ·¢ÏÖÆäʵżµÄCѧµÄ²»ÔõôÑù°¡£¬ºÃ¶àº¯Êý¶¼²»¼ÇµÃ£¬ÔÚÍøÉÏËѵ½µÄ¶¼ÊÇЩÂÒÆß°ËÔãµÄ£¬Ã»ÓÐÔ­ÐÍ£¬ÓÃÆðÀ´²»·ÅÐÄ£¬ÓãÅÎÄËÑ£¬Ëѵ½ÕæÕýµÄBible——
The GNU C Library Manual
ÕâÀïÃæÌ«È«ÁË£¬Ö»ÊÇÓÐÒ»µã²»Ì«ºÃ£¬£ÅÎĵ쬶ÁÆðÀ´ÓеãÂý£¬¸Ð¾õÓеãÀË·Ñʱ¼ä
ÓãÃдÁ˶ÎС³ÌÐò°ÑÒ»¸öÎå±ÊÂëÎı¾Îĵµ×ªÎªSQLite3¸ñʽµÄÊý¾Ý¿â
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <regex.h>
#include <sqlite3.h>
int main(int argc, char** argv)
{
sqlite3 *db = NULL;
char *zErrMsg = 0;
int rc = 0;

rc = sqlite3_open("wubi.db",&db);
if( rc )
{
fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
sqlite3_close(db);
exit(1);
}
char *sql, insert[256];
sql = "CREATE TABLE word (cn VARCHAR(3) NOT NULL, first VARCHAR(4) NOT NULL, sec VARCHAR(4), pri SMALLINT DEFAULT 0)";
sqlite3_exec( db, sql, 0, 0, &zErrMsg );
sql = "CREATE TABLE wordgroup (cn VARCHAR(12) NOT NULL, first VARCHAR(4) NOT NULL, ind ......

C++/CһЩÀàÐ͵Äȡֵ·¶Î§

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long longµÄ×îСֵ£º-9223372036854775808
unsigned long longµÄ×î´óÖµ£º1844674407370955161
__int64µÄ×î´óÖµ£º9223372036854775807
__int64µÄ×îСֵ£º-9223372036854775808
unsigned __int64µÄ×î´óÖµ£º18446744073709551615
ÎҵĵçÄÔ¶Ô__int128²»Ö§³Ö£¬Õâ¸ö¿ÉÄÜÊÇÔ¤Áô¸ø½«À´µÄ°É£º
view plaincopy to clipboardprint?
#if     _INTEGRAL_MAX_BITS >= 128   
  
#define _I128_MIN   (-170141183460469231731687303715884105727i128 - 1)   
  
#define _I128_MAX     170141183460469231731687303715884105727i128   
  
#define _UI128_MAX    0xffffffffffffffffffffffffffffffffui128   
#endif  
#if <wbr> <wbr> <wbr> <wbr> _INTEGRAL_MAX_BITS >= 128
#define _I128_MIN <wbr> <wbr> (-170141183460469231 ......

C++/CһЩÀàÐ͵Äȡֵ·¶Î§

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long longµÄ×îСֵ£º-9223372036854775808
unsigned long longµÄ×î´óÖµ£º1844674407370955161
__int64µÄ×î´óÖµ£º9223372036854775807
__int64µÄ×îСֵ£º-9223372036854775808
unsigned __int64µÄ×î´óÖµ£º18446744073709551615
ÎҵĵçÄÔ¶Ô__int128²»Ö§³Ö£¬Õâ¸ö¿ÉÄÜÊÇÔ¤Áô¸ø½«À´µÄ°É£º
view plaincopy to clipboardprint?
#if     _INTEGRAL_MAX_BITS >= 128   
  
#define _I128_MIN   (-170141183460469231731687303715884105727i128 - 1)   
  
#define _I128_MAX     170141183460469231731687303715884105727i128   
  
#define _UI128_MAX    0xffffffffffffffffffffffffffffffffui128   
#endif  
#if <wbr> <wbr> <wbr> <wbr> _INTEGRAL_MAX_BITS >= 128
#define _I128_MIN <wbr> <wbr> (-170141183460469231 ......

C/C++ÃæÊÔÌâÁù£¨¾­µä) ¡¾×ª¡¿

1.ÇóÏÂÃæº¯ÊýµÄ·µ»ØÖµ£¨Î¢Èí£©
int func(x)
{
    int countx = 0;
    while(x)
    {
          countx ++;
          x = x&(x-1);
     }
    return countx;
}
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3. ½«“ÒýÓÔ×÷Ϊº¯Êý²ÎÊýÓÐÄÄÐ©ÌØµã£¿
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C/C++ÃæÊÔÌâÁù£¨¾­µä) ¡¾×ª¡¿

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
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´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£¿
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CÖжÁÈ¡Êý×é

#include <stdio.h>
#include <stdlib.h>
#define MAXSIZE 100
main()
{
FILE *fp;
if ( (fp = fopen( "c:\\a.txt", "r" )) == NULL ) printf("ERROR!\n");
int tmp[MAXSIZE];
int i;
for ( i=0; i<MAXSIZE; i++ )
{
tmp[i] = 0;
}
char chtmp[10000];
i=0;
while ( !feof(fp) && i!=MAXSIZE )
{
fscanf( fp, "%d ", &tmp[i] );
//printf("tmp[%d]=%d",i,tmp[i]);
i++;
}
for ( i=0; i<MAXSIZE; i++ )
{
printf( "tmp[%3d]=%d\n", i, tmp[i] );
}
fclose( fp );
system("PAUSE");
}
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linux±àдc³ÌÐò·¢ÏÖ

Õ⼸ÌìÎÒ°²×°ÁËÒ»¸öLinuxϵͳ£¬ÏëÔÚÀïÃæÑ§Ò»ÏÂCÓïÑԵıàд£¬·¢ÏÖÔÚÀïÃæÔËÐÐÓÐÒ»¸öºÃÆæ¹ÖµÄÏÖÏó£ºÈçÏÂÃæ
#include<stdio.h>
void mian(){
printf("hello world!");
}
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#include<stdio.h>
void mian(){
printf("hello world!\n");
}
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linux±àдc³ÌÐò·¢ÏÖ

Õ⼸ÌìÎÒ°²×°ÁËÒ»¸öLinuxϵͳ£¬ÏëÔÚÀïÃæÑ§Ò»ÏÂCÓïÑԵıàд£¬·¢ÏÖÔÚÀïÃæÔËÐÐÓÐÒ»¸öºÃÆæ¹ÖµÄÏÖÏó£ºÈçÏÂÃæ
#include<stdio.h>
void mian(){
printf("hello world!");
}
Êä³öûÓнá¹û£¡¸ãµÄÎÒ¿´Á˰ëÌ죬³ÌÐòûÓдíÎó°¡£¡ÔõôÕâÑù£¡ºóÀ´ÎҰѳÌÐò¸ÄΪ
#include<stdio.h>
void mian(){
printf("hello world!\n");
}
±àÒ룬ÔËÐУ¬Êä³öhello world£¡
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    ¿ÉÊÓ±à³ÌÔÚ½éÉܵ¥Ôª²âÊÔµÄÐ§ÒæÊ±ÒѾ­½²¹ýÁË£¬ÕâÀï²»ÔÙÏêϸ½éÉÜ¡£ÎÒÃdzõѧCÓïÑÔ±à³Ìʱ£¬¶¼ÊÇдһЩСËã·¨£¬Ò»±ßдһ±ßÔÚ¿ØÖÆÌ¨´òӡһЩÊý¾Ý£¬¿´¿´³ÌÐò×öÁËЩʲô£¬ÕâÊǺܸßЧºÍÇáËɵıà³Ì·½Ê½£¬µ«ÔÚʵ¼ÊµÄÏîÄ¿ÖУ¬ÓÈÆäÊDz¢Ðпª·¢µÄ´óÏîÄ¿ÖУ¬ÕâÖÖ·½Ê½¾Í²»ÏÖʵÁË¡£¿ÉÊÓ±à³Ì¿ÉÒÔÈÃÎÒÃÇÖØ·µÐ¡Ëã·¨±à³Ì¡£
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    ¿ÉÊÓ±à³ÌÔÚ½éÉܵ¥Ôª²âÊÔµÄÐ§ÒæÊ±ÒѾ­½²¹ýÁË£¬ÕâÀï²»ÔÙÏêϸ½éÉÜ¡£ÎÒÃdzõѧCÓïÑÔ±à³Ìʱ£¬¶¼ÊÇдһЩСËã·¨£¬Ò»±ßдһ±ßÔÚ¿ØÖÆÌ¨´òӡһЩÊý¾Ý£¬¿´¿´³ÌÐò×öÁËЩʲô£¬ÕâÊǺܸßЧºÍÇáËɵıà³Ì·½Ê½£¬µ«ÔÚʵ¼ÊµÄÏîÄ¿ÖУ¬ÓÈÆäÊDz¢Ðпª·¢µÄ´óÏîÄ¿ÖУ¬ÕâÖÖ·½Ê½¾Í²»ÏÖʵÁË¡£¿ÉÊÓ±à³Ì¿ÉÒÔÈÃÎÒÃÇÖØ·µÐ¡Ëã·¨±à³Ì¡£
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