C --gettimeofday===获取某个程序经历的时间

#include <stdio.h>
#include <sys/time.h>
#include <time.h>
int gettimeofday(struct timeval*tv,struct timezone *tz);

int main(int argc, char* argv[])
{
   int timeuse;
   struct timeval starttime,endtime;
   gettimeofday(&starttime,);
     sleep();
   gettimeofday(&endtime,);
   timeuse=(endtime.tv_sec-starttime.tv_sec)*+endtime.tv_usec-starttime.tv_usec;
   timeuse/= ;
   printf("the programme run %d second/n the result of 1+2+3+....100 \n ",timeuse);
   printf("Hello World!\n");
    return ;
}

获取某个程序运行经历的时间差值.