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#include 
time_t time(time_t *tloc);
char *ctime(const time_t *clock);
timeº¯Êý·µ»Ø´Ó1970Äê1ÔÂ1ÈÕ0µãÒÔÀ´µÄÃëÊý.´æ´¢ÔÚtime_t½á¹¹Ö®ÖÐ.²»¹ýÕâ¸öº¯ÊýµÄ·µ»ØÖµ¶ÔÓÚÎÒÃÇÀ´ËµÃ»ÓÐʲôʵ¼ÊÒâÒå.Õâ¸öʱºòÎÒÃÇʹÓõڶþ¸öº¯Êý½«ÃëÊýת»¯Îª×Ö·û´®. Õâ¸öº¯ÊýµÄ·µ»ØÀàÐÍÊǹ̶¨µÄ:Ò»¸ö¿ÉÄÜֵΪ. Thu Dec 7 14:58:59 2000 Õâ¸ö×Ö·û´®µÄ³¤¶ÈÊǹ̶¨µÄΪ26 
2¡£Ê±¼äµÄ²âÁ¿     ÓÐʱºòÎÒÃÇÒª¼ÆËã³ÌÐòÖ´ÐеÄʱ¼ä.±ÈÈçÎÒÃÇÒª¶ÔËã·¨½øÐÐʱ¼ä·ÖÎö.Õâ¸öʱºò¿ÉÒÔʹÓÃÏÂÃæÕâ¸öº¯Êý. 
#include 
int gettimeofday(struct timeval *tv,struct timezone *tz);
strut timeval {
long tv_sec; /* ÃëÊý */
long tv_usec; /* ΢ÃëÊý */
};
gettimeofday½«Ê±¼ä±£´æÔڽṹtvÖ®ÖÐ.tzÒ»°ãÎÒÃÇʹÓÃNULLÀ´´úÌæ. 
#include #include #include 
void function()
{
 unsigned int i,j;
 double y;
 for(i=0;i<1000;i++)
 for(j=0;j<1000;j++)
   y=sin((double)i);
}
main()
{
 struct timeval tpstart,tpend;
 float  timeuse;
 gettimeofday(&tpstart,NULL);
 function();
 gettimeofday(&tpend,NULL);
 timeuse=1000000*(tpend.tv_sec-tpstart.tv_sec)+
tpend.tv_usec-tpstart.tv_usec;
 timeuse/=1000000;
 printf("Used Time:%f\n",timeuse);
 exit(0);

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