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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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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#include
<stdio.h>
int
main()
{
int
i = 0;
int
name[10] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
......
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; ......