Function fib_classic_iteration_for_c

cpp/fib.c:14–25

}

size_t fib_classic_iteration_for_c(size_t n)
{
    if (0 == n) return 0;
    if (1 == n || 2 == n) return 1;
    size_t prev = 1, curr = 1;
    for (size_t i = 3; i <= n; i++) {
        size_t sum = prev + curr;
        prev = curr;
        curr = sum;
    }
    return curr;
}