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Hi,

You made this question a long time ago, but I used your code to understand what was wrong with mine. Finally, I got accepted and in the process I found your bug (well, at least one bug - and, of course you may have found it already, but this can help someone else):

In same cases, your angle ...

You have problems with rounding. Using floating point in this problem is kind of lottery.

Here's a rounding function which does not make use of any floats.
int round1(int p, int q) /* Rounds fraction p/q */
{
return (p / q) + (((2 * (p % q)) >= q) ? 1 : 0);
}

Hi,

first I had something like ...