/*---------------------------------------------------*/

/*  Program chapter3_5                               */

/*                                                   */

/*  This program generates a summary report from     */

/*  a data file that has the number of data points   */

/*  in the first record.                             */



#include <stdio.h>

#define FILENAME "sensor1.dat"



int main(void)

{

   /*  Declare and initialize variables.  */

   int num_data_pts, k;

   double time, motion, sum=0, max, min;

   FILE *sensor1;



   /*  Open file and read the number of data points.  */

   sensor1 = fopen(FILENAME,"r");

   fscanf(sensor1,"%i",&num_data_pts);



   /*  Read data and compute summary information.  */

   for (k=1; k<=num_data_pts; k++)

   {

      fscanf(sensor1,"%lf %lf",&time,&motion);

      if (k == 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(sensor1);

   return 0;

}

/*---------------------------------------------------*/