/*
 * 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>

#define ARRAY_SIZE 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 running_total = 0;

	for (i = 0; i < count; ++i) {
		running_total += nums[i];
	}
	return running_total;
}

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

	int input;
	int sum;
	int index = 0;
	int nums[ARRAY_SIZE];

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

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

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

	return 0;

}