I'm surprised (and a bit pissed off) not to find a means to round a number to
the nearest integer.
I want to use the rand() function to randomly generate a rotation angle which is
a multiple of 90 degrees, which I would write in any programming language I know
as

  RotAngle = 90 * round(4 * rand(RandSeed))

How should I do this in POV-Ray?
TIA
Steven

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