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INTEGER; OPTIONAL; scalar; INTENT(IN).
Returns a uniform quasi-random number between 0 and 1.
If Flag is 0, the next number in sequence is returned; if
Flag is 1, the generator is restarted by calling `srand(0)';
if Flag has any other value, it is used as a new seed with
See section 22.214.171.124 SRand Intrinsic.
Note: As typically implemented (by the routine of the same name in the C library), this random number generator is a very poor one, though the BSD and GNU libraries provide a much better implementation than the `traditional' one. On a different system you almost certainly want to use something better.
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