single for-loop runtime explanation problem
- by owwyess
I am analyzing some running times of different for-loops, and as I'm getting more knowledge, I'm curious to understand this problem which I have still yet to find out.
I have this exercise called "How many stars are printed":
for (int i = N; i > 1; i = i/2) System.out.println("*");
The answers to pick from is
A: ~log N
B: ~N
C: ~N log N
D: ~0.5N^2
So the answer should be A and I agree to that, but on the other side.. Let's say N = 500 what would Log N then be? It would be 2.7. So what if we say that N=500 on our exercise above? That would most definitely print more han 2.7 stars? How is that related?
Because it makes sense to say that if the for-loop looked like this:
for (int i = 0; i < N; i++)
it would print N stars.
I hope to find an explanation for this here, maybe I'm interpreting all these things wrong and thinking about it in a bad way. Thanks in advance.
