/*
 * Program to print numbers from input in reverse order and compute
 * their sum.  (Not a very sensible program, but an example of using
 * an array.)
 *
 * Input:  Zero or more integers, read from standard input, terminated
 *   by anything other than a number. 
 *
 * Output:  Input numbers in reverse order, then sum of input numbers 
 *   (zero if none).
 */
#include <stdio.h>
#include <stdlib.h>

#define MAXNUMS 100

/*
 * Compute sum of array elements:
 *   returns sum of nums[0] through nums[count-1].
 */
int sum_of_elements(int count, int nums[]) {
	int i;
	int sum = 0;
	for (i = 0; i < count ; ++i) {
		sum += nums[i];
	}
	return sum;
}

/* 
 * Main program 
 */
int main(void) {

	int nums[MAXNUMS];

	int input;
	int count = 0;
	int i;

	printf("enter numbers to add (no more than %d), non-number to end:\n",
		MAXNUMS);

	while ((scanf("%d", &input) == 1) && (count < MAXNUMS)) {
		nums[count] = input;
		count += 1;
	}

	printf("in reverse order, you entered:\n");
	
	for (i = count-1 ; i >= 0  ; --i) {
		printf("%d\n", nums[i]);
	}

	printf("sum of elements = %d\n", sum_of_elements(count, nums));	

	return EXIT_SUCCESS;
}