/*************************************
**  proj2.c
**
**  Dennis L. Frey
**  November 11, 1998
**
**  This program reads positive integers from
** a file using Unix redirection.  It counts
** the number of positive integers, finds the
** largest value, the smallest value and the
** average of all the integers.
**   This program stops reading the file when
** -1 is found in the file.
**
**  Assumptions -- there are only positive integers
** except for the terminating -1.  there is at least
** one positive integer in the file
**
**  Algorithm
**	declare and initialize variables
**	read the first positive integer
**	while the value read is not -1
**	    increment the count of positive integers
**	    add the value to the total
**	    if this value is larger than the largest so far
**		make this value the largest
**	    else if this value is smaller than the smallest so far
**		make this the smallest
**	calculate the average
**	print out the statistics
****************************************************/

#include <stdio.h>

#define SENTINEL -1

main ( )
{
    int   count = 0;		/* number of integers */
    int   largest;
    int   smallest;
    int   value;
    long  sum = 0;		/* sum of all the integers entered */
    float average;

    printf ("Enter positive integers, one per line, -1 to quit\n");
    scanf ("%d", &value);

    /* assume first value is not -1, so it can
    ** can be considered the largest and smallest
    */
    largest = smallest = value;

	
    /* add each value to total
    ** increment count of positive ints
    ** check if its the largest
    ** check if its the smallest
    */
    while (value != SENTINEL)
    {
	sum += value;
	count++;
 	if (value > largest)
	{
	    largest = value;
	}
	else if (value < smallest)
	{
	    smallest = value;
	}

	/* now get the next value */
	scanf ("%d", &value);
    }

    /* assume count >= 1; calc average */
    average = (float)sum / count;

    /* print the statistics */
    printf ("\n");
    printf ("There were %d positive integers\n\n", count);
    printf ("The average is %0.2f\n", average);
    printf ("The maximum value is %d\n", largest);
    printf ("The minimum value is %d\n", smallest);
    printf ("The sum of the integers is %d\n", sum);
    printf ("\n");
}