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C/C++——С±à̸CÓïÑÔº¯ÊýÄÇЩÊÂ(12)

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1.       ldexpº¯Êý
ldexpº¯ÊýµÄ¹¦ÄÜÊǼÆËãvalue*2µÄÃÝ£¬ÆäÓ÷¨Îª£ºdouble ldexp(double value, int exp);³ÌÐòʵÀýÈçÏ£º
    #include <stdio.h>
#include <math.h>
int main(void)
{
     double value;
     double x = 2;
     value = ldexp(x,3);
     printf("The ldexp value is: %lf\n",value);
     return 0;
}
2.       lfindº¯Êý
lfindº¯ÊýµÄ¹¦ÄÜÊÇÖ´ÐÐÏßÐÔËÑË÷£¬ÆäÓ÷¨Îª£ºvoid *lfind(void *key, void *base, int *nelem, int width,int (*fcmp)());   ³ÌÐòʵÀý´úÂëÈçÏ£º
#include <stdio.h>
#include <stdlib.h>
int compare(int *x, int *y)
{
     return( *x - *y );
}
int main(void)
{
   int array[5] = {35, 87, 46, 99, 12};
   size_t nelem = 5;
   int key;
   int *result;
   key = 99;
   result = lfind(&key, array, &nelem,
        sizeof(int), (int(*)(const void *,const void *))compare);
   if (result)
      printf("Number %d found\n",key);
   else
      printf("Number %d not found\n",key);
   return 0;
}
3.       lockº¯Êý
lockº¯ÊýµÄ¹¦ÄÜÊÇÉèÖÃÎļþ¹²ÏíËø£¬ÆäÓ÷¨Îª£ºint lock(int handle, long offset, long length);³ÌÐòʵÀý´úÂëÈçÏ£º
#include <io.h>
#include <fcntl.h>
#include <sys\stat.h>
#include <process.h>
#include <share.h>
#include <stdio.h>
int main(void)
{
   int handle, status;
   long length;
   handle = sopen("c:\\autoexec.bat",
      O_RDONLY,SH_DENYNO,S_IREAD);
   if (ha


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C/C++——С±à̸CÓïÑÔº¯ÊýÄÇЩÊÂ(8)

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1.       gcvtº¯Êý
 
gcvtº¯ÊýµÄ¹¦ÄÜÊǰѸ¡µãÊýת»»³É×Ö·û´®£¬ÆäÓ÷¨ÊÇ£ºchar *gcvt(double value, int ndigit, char *buf);³ÌÐò ......

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    ǰÁ½ÌìÔÚÍøÉÏ¿´µ½¡¶Cר¼Ò±à³Ì¡·Õâ±¾ÊéµÄÆÀ¼Û»¹²»´í£¬¾ÍÈ¥ÊéµêÂòÁËÒ»±¾»ØÀ´Åõ¶Á£¬Ã¿ÌìÍíÉÏ¿´Ò»Ð©¡£Ì½ÌÖµÄÎÊÌâȷʵ±È½ÏÉ¶¼ÔÚÌÖÂÛCÓïÑÔ±¾ÉíµÄÎÊÌâÁË¡£Ìáµ½ÁËCÓïÑÔÖеÄһЩ²»×ã¡£±¾À´ÈÏΪCÓïÑÔÊÇÎÞи¿É»÷µÄ£¬¿É´Ó×÷ÕߵĽǶȿ´À´£¬È·ÊµÓÐЩ²»Í׵ĵط½£¬ÏëÏëÒ²ÊÇ£¬ÄÄÓÐÍêÃÀÎÞȱ¶«Î÷ÄØ¡£Æäʵ×÷ÕßÒ²²¢·ÇÔڱᵠ......

Hidden Tricks (C)(091121)

 ÇëÔËÐÐÏÂÃæµÄ´úÂ룬¹Û²ì½á¹û£¬ÓÐÈË˵ÔõôÊÇËÀÑ­»·£¬ÄãͬÒâÂð£¿ÎªÊ²Ã´£¿
 
#include
 <stdio.h>
int
 main()
{
  int
 i = 0;
  int
 name[10] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; ......

C/C++Èí¼þ¹¤³Ìʦ¾ÍÒµÇóÖ°ÊÖ²á½ÚÑ¡¶þ

 5¡¢#defineºê¶¨Òå¡£ºêÖ»ÊǼòµ¥µÄÎı¾Ìæ»»£¬ºÜÈÝÒ×ÒýÆðÆçÒå¡£
#include <stdio.h>
#define CONS(a,b) (int)(a##e##b)
#define STR(s) #s
int main()
{
   printf(STR(vck));
   printf("\n");
   printf("%d\n",CONS(2,3));
   return 0; ......
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