Re: Bug: random() can return 1.0 - Mailing list pgsql-hackers

Bruce Momjian <pgman@candle.pha.pa.us> writes:
> Because random returns a double, I think it is very possible that we
> could return 1 due to rounding,

Not unless your machine has a "double" type with less than 32 bits of
precision, which seems pretty unlikely.  It'd be sufficient to do
/* result 0.0 <= x < 1.0 */result = ((double) random()) / ((double) MAX_RANDOM_VALUE + 1.0);

        regards, tom lane