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I want if() to be true at a rate of 1/40.000, however, rand() is not precise enough and outputs 0 quite often
That's not the way random works. It doesn't guarantee 1/40000, if it did, it would not be "random".
It only guarantees that the ratio will tend towards 1/40000 over time.
Most times it will produce 1/40000; but sometimes it will be 0/40000; sometimes 2/40000; occasionally 3/40000; very occasionally even 4/40000; but over time they will tend to balance each other out and the ratio will tend to get closer and closer to 1/40000.
Try running this for a while to see how it works:
If you need to always get one true from every 40,000, then use:
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In reply to Re: rand() precision low, looking for a fast way to get high precision rand float?