Interview Question for Software Engineer at Dell:

Assuming array size is known:

can be done in two ways
1) store size in the first element
2) End the last element with a sentinel value like (I feel this is more common)

For 2nd case

int64_t sum = 0;
uint32_t index = 0;
while (arr[i++] != -1)
{
   sum+= arr[i];
}

return sum;