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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(9)

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1.     harderrº¯Êý
harderrº¯ÊýµÄ¹¦ÄÜÊǽ¨Á¢Ò»¸öÓ²¼þ´íÎó´¦Àí³ÌÐò£¬ÆäÓ÷¨ÊÇ£ºvoid harderr(int (*fptr)());³ÌÐòÀý×ÓÈçÏ£º
#include <stdio.h>
......

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µ±È»ÈÝÄÉÒ»Çв¢²»Òâζ×ÅÊʺÏÓÚÒ»ÇС£ÏñC/C++ÕâÑùÔç¾Í´æÔڵIJ¢¹ã·ºÓ¦ÓõÄÓïÑÔ£¬Ôç¾ÍÓÐÒ»´óÅú¿ÉÓõÄIDE£¬Ò²ÓкܶàÈËϲ»¶ÓÃvi/emacs×÷Ϊ×Ô¼ºµÄ¿ ......

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#ifndef _PPC_BOOT_STRING_H_
#define _PPC_BOOT_STRING_H_
#include <stddef.h>
extern char *strcpy(char *dest, const char *src);
extern char *strncpy(char *dest, const char *src, size_t n);
extern char *strcat(char *dest, const char *src);
extern int strcmp(const char *s1, const cha ......

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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ÏÖÔڵĴúÂëÈçÏ£¬¿ÉÄÜ»¹Óв»ÍêÉƵĵط½£¬ÒÔºóÔٸĽø£º
#include <stdio.h>
#define CHARCOUNT 255
#define CON 6 /*µ¥ÐÐ×¢ÊÍ×îÉÙµÄʱºò*/
int realLength = 0;
/*
* function name: strCount
* function : count ......
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