(11C) Random Prime Number Generator
10-22-2018, 09:11 AM
Post: #19
 Thomas Klemm Senior Member Posts: 2,069 Joined: Dec 2013
RE: (11C) Random Prime Number Generator
(10-22-2018 01:02 AM)Albert Chan Wrote:  It seems about 50% of the time, N * RAN# = N rounding bug will not occur.

I wouldn't call this a bug. After all the result is rounded correctly.
It really depends on the mantissa $$m$$ of the number.
If $$1 < m \leqslant 5$$ then the result is rounded up.
Otherwise it's rounded down.

Obviously I wasn't aware of this fact when I wrote the program.
So, props to Dieter for pointing that out.

A similar thing happens with 0.9999999998.
Here the result is rounded up if $$1 < m \leqslant 2.5$$.

And then with 0.9999999997 the result is rounded up if $$1 < m \leqslant 1.666666666$$.
Finally with 0.9999999996 the result is rounded up if $$1 < m \leqslant 1.25$$.

Cheers
Thomas
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 Messages In This Thread (11C) Random Prime Number Generator - Gamo - 10-20-2018, 01:08 PM RE: (11C) Random Prime Number Generator - Dieter - 10-20-2018, 07:08 PM RE: (11C) Random Prime Number Generator - Gamo - 10-21-2018, 03:22 AM RE: (11C) Random Prime Number Generator - Dieter - 10-21-2018, 05:09 PM RE: (11C) Random Prime Number Generator - Thomas Klemm - 10-21-2018, 08:45 AM RE: (11C) Random Prime Number Generator - Dieter - 10-21-2018, 04:41 PM RE: (11C) Random Prime Number Generator - Albert Chan - 10-21-2018, 01:31 PM RE: (11C) Random Prime Number Generator - John Keith - 10-21-2018, 01:52 PM RE: (11C) Random Prime Number Generator - Dieter - 10-22-2018, 11:03 AM RE: (11C) Random Prime Number Generator - Dieter - 10-21-2018, 05:20 PM RE: (11C) Random Prime Number Generator - Albert Chan - 10-21-2018, 07:02 PM RE: (11C) Random Prime Number Generator - Albert Chan - 10-22-2018, 01:02 AM RE: (11C) Random Prime Number Generator - Gene - 10-21-2018, 07:47 PM RE: (11C) Random Prime Number Generator - Dieter - 10-21-2018, 09:09 PM RE: (11C) Random Prime Number Generator - Thomas Klemm - 10-21-2018, 08:47 PM RE: (11C) Random Prime Number Generator - Thomas Klemm - 10-21-2018, 09:03 PM RE: (11C) Random Prime Number Generator - Gene - 10-21-2018, 10:02 PM RE: (11C) Random Prime Number Generator - Thomas Klemm - 10-22-2018, 03:46 AM RE: (11C) Random Prime Number Generator - Thomas Klemm - 10-22-2018, 04:10 AM RE: (11C) Random Prime Number Generator - Thomas Klemm - 10-22-2018 09:11 AM RE: (11C) Random Prime Number Generator - Thomas Klemm - 10-22-2018, 09:22 AM RE: (11C) Random Prime Number Generator - Gamo - 10-22-2018, 10:32 AM RE: (11C) Random Prime Number Generator - Dieter - 10-22-2018, 11:23 AM RE: (11C) Random Prime Number Generator - Thomas Klemm - 10-22-2018, 12:28 PM RE: (11C) Random Prime Number Generator - Thomas Klemm - 10-22-2018, 12:31 PM RE: (11C) Random Prime Number Generator - Dieter - 10-22-2018, 06:43 PM

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