#include <stdio.h>
#include <assert.h>
#define LEN(x) (sizeof(x)/sizeof(*x))
#define NUM 0
int sum(int array[], int *end) {
assert(array && end && array < end);
int result = 0;
for (; array != end; array++)
result += *array;
return result;
}
int* find(int array[], int *end, int value) {
assert(array && end && array < end);
for (; array != end; array++)
if (*array == value)
return array;
return NULL;
}
int main() {
int a[] = { 7, 0, 3, 2, 5, 0, -7, 4 };
int *first = find(a, a + LEN(a), NUM) + 1,
*last = find(first, a + LEN(a), NUM),
result = sum(first, last);
printf("%d", result);
return 0;
}
