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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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