Re: [HACKERS] Re: Trouble with float4 after upgrading from 6.5.3 to 7.0.2

At 11:35 7/08/00 -0400, Tom Lane wrote:
>
>Perhaps the old way of considering equality only to float accuracy
>is more useful, even though it opens us up to problems like overflow
>errors in "float4var = 1e100". Comments anyone?
>

The following frightened me a little:

pjw=# select float4(10.1);
float4
--------
10.1
(1 row)

pjw=# select float8(float4(10.1));
float8
------------------
10.1000003814697
(1 row)

I would have expected the latter to be at worst 10.10000000000000 +/-
.00000000000001.

Am I missing something?

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