#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <strings.h>    

#define DATEN "test2"
#define MAX 1.7

void main()
{
	FILE* fp;
	float x,y,out;
	if ((fp=(FILE*)fopen(DATEN,"r"))==NULL)
	{
		fprintf(stderr,"cannot open file\n");
		exit(1);
	}
	if (fscanf(fp,"%f",&x)==0)
	{
		fprintf(stderr,"no data\n");
		fclose(fp);
		exit(1);
	}
	while (fscanf(fp,"%f",&y)>0)
	{
		out=y-x; x=y;
		fprintf(stdout,"%f\n",out/MAX);
	}
	fclose(fp);
}