/*
 * Program to compute sum of integers entered as input (any number of them), 
 * using a loop.
 */
#include <stdio.h>

int main(void) {
	printf("enter integers, anything else to stop\n");
	int sum = 0;
	int input;
	/* 
	 * somewhat cryptic but C-idiomatic:
	 * tries to read a value into input as part of evaluating condition 
         * if it succeeds, loop continues; otherwise it stops
	 */
	while (scanf("%d", &input) == 1) {
		sum += input;
	} 
	printf("sum is %d\n", sum);
	return 0;
}