/*---------------------------------------------------*/
/*  Program chapter3_7                               */
/*                                                   */
/*  This program generates a summary report from     */
/*  a data file that does not have a header record   */
/*  or a trailer record.                             */

#include <stdio.h>
#define FILENAME "sensor3.dat"

int main()
{
   /*  Declare and initialize variables.  */
   int num_data_pts=0, k;
   double time, motion, sum=0, max, min;
   FILE *sensor3;

   /*  Open file.  */
   sensor3 = fopen(FILENAME,"r");

   /*  While not at the end of the file,  */
   /*  read and accumulate information.   */
   while ((fscanf(sensor3,"%lf %lf",&time,&motion)) == 2)
   {
      num_data_pts++;
      if (num_data_pts == 1)
	 max = min = motion;
      sum += motion;
      if (motion > max)
	 max = motion;
      if (motion < min)
	 min = motion;
   }

   /*  Print summary information.  */
   printf("Number of sensor readings: %i \n",
	  num_data_pts);
   printf("Average reading:           %.2f \n",
	  sum/num_data_pts);
   printf("Maximum reading:           %.2f \n",max);
   printf("Minimum reading:           %.2f \n",min);

   /*  Close file and exit program.  */
   fclose(sensor3);
   return 0;
}
/*---------------------------------------------------*/