Re: PrivInf

From: [at]} <Gérard>
Date: Tue, 14 Sep 2004 17:30:41 +0200

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Content-type: text/plain

> From the documentation (CP-Land.odc):

>
> "The operators +, -, *, and / apply to operands of numeric types. The type
of the result is REAL if the operation is a division (/) or one of the
operand types is a REAL. Otherwise the result type is SHORTREAL if one of
the operand types is SHORTREAL, LONGINT if one of the operand types is
LONGINT, or INTEGER in any other case. If the result of a real operation is
too large to be represented as a real number, it is changed to the
predeclared value INF with the same sign as the original result. Note that
this also applies to 1.0/0.0, ****but not to 0.0/0.0 which has no defined
result at all and leads to a run-time error.****"
>
> Since this is something that was changed with Rel 1.4, I can find no fault
with BB here.

Ren,

I think there is one. It seems that the compiler accepts INF as a SHORTREAL,
but not as a REAL. In:
    q := 3.402823466385288E38 / INF;
the constant is a SHORTREAL (<= MAX(SHORTREAL)), and the compiler handles
INF as a SHORTREAL too; there is no error and the result is 0., as expected.
But in:
    r := 3.402823466385289E38 / INF;
the constant is REAL, INF is considered as REAL and rejected as too big, at

compile time. I can't find any remark on this fact in the language
reference, so I think it's a compiler bug.

Regards.

Grard

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Received on Tue Sep 14 2004 - 17:30:41 UTC

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