| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | darcy(at)druid(dot)net (D'Arcy J(dot)M(dot) Cain) |
| Cc: | lockhart(at)alumni(dot)caltech(dot)edu (Thomas G(dot) Lockhart), pgsql-hackers(at)postgreSQL(dot)org |
| Subject: | Re: [HACKERS] Warning!! |
| Date: | 1998-11-04 21:19:15 |
| Message-ID: | 9291.910214355@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
darcy(at)druid(dot)net (D'Arcy J.M. Cain) writes:
>> ! *result = floor((*f) * (*c) + 0.5);
> Is this correct? What about "select cash_mul_flt8('$1', '123.99')?"
> Wouldn't that convert it to 124.00?
No, because the cash type is actually "int". Presumably it's scaled
up by a factor of 100 compared to what's printed --- otherwise you'd
never be able to represent pennies at all. So the "round to nearest
integer" logic depicted above is really rounding to nearest penny.
regards, tom lane
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