/*
 * Recursive version of sum-while program, for comparison purposes.
 */
#include <stdio.h>

int sum(void);

int main(void) {
	printf("enter integer values, anything else to end\n");
	printf("sum is %d\n", sum());
	return 0;
}

/* sum integers read from stdin */
int sum(void) {
	int n;
	if (scanf("%d", &n) == 1) {
		return n + sum();
	}
	else {
		return 0;
	}
}