#include <stdio.h>
#include <stdlib.h>
int main ()
{
FILE * fp;
int i;
double dwert;
fp = fopen ("double.dat","wb");
if (fp == NULL)
  {
  fprintf(stderr,"\nKein Öffnen.\n");
  exit (3);
  }
dwert = 1.001;
for (i = 0; i < 200; i++)
  {
  if (fwrite(&dwert,sizeof(dwert),1,fp) !=1)
    {
    fprintf(stderr,"\nKein Schreiben\n");
    fclose (fp);
    exit (4);
    }
  dwert += 0.002;
  }
return (fclose (fp));
}