CSV 形式ランダムデータの合成（C を使用）（Ubuntu 上）

#include<stdio.h>
#include<time.h>
#include<sys/time.h>
#include<stdlib.h>

int main(int argc, char** argv)
{
  struct timeval tv;
  struct tm *pnow = NULL;
  int i;
  srand((unsigned)time(NULL));

  for( i = 1; i < atoi(argv[1]); i++ ) {

    gettimeofday(&tv, NULL);
    pnow = localtime(&tv.tv_sec);

    int yy = pnow->tm_year+1900; 
    int mm = pnow->tm_mon + 1; 
    int dd = pnow->tm_mday; 

    int h = pnow->tm_hour;
    int m = pnow->tm_min;
    int s = pnow->tm_sec;
    int msec = tv.tv_usec; 

    /* K, NAME */
    printf( "%12.12d, A001, ", i ); 
    /* B1, B2 */ 
    printf( "%f, %f, ",     100.0 * ((double)rand())/RAND_MAX,     100.0 * ((double)rand())/RAND_MAX ); 
    /* created_at */ 
    printf( "%4.4d-%2.2d-%2.2d %2.2d:%2.2d:%2.2d.%6.6d\n", yy, mm, dd, h, m, s, msec ); 
  }

  return 0;
}