#include <stdio.h>
#include <stdint.h>
#include <time.h>
#include <unistd.h>

volatile uint64_t a,b;

int main()
{
  int i;
  clock_t start,end,ended;
  for (i=0;i<10000000;i++){
    a = b * a * i;
  }
  start = clock();
  for (i=0;i<10000000;i++){
    a = b * a * i;
  }
  end = clock();
  sleep(1);
  ended = clock();
  printf("start %ld end %ld diff %ld\n", start, end, end-start);
  printf("end %ld ended %ld diff %ld\n", end, ended, ended-end);
}