What are the differences between

int size = (int)((length * 200L) / 100L); // (1)

and

int size = length << 1; // (2)

(length is int in both cases)

I assume both code snippets want to double the length parameter.

I'd be tempted to use (2) ... so are there any advantages for using (1)? I looked at the edge cases when overflow occurs, and both versions seem to have the same behavior.

Please tell me what am I missing.