Re: A BUG of 64-bit integer addition

[Aharon Robbins]

In article <address@hidden> you write:
>Steffen Schuler schrieb:
>
>> gawk uses internally the C-type double also for integer calculation with a
>> mantissa of 53 bit length.
>> (AMD Athlon, Linux, gcc 4.2.3, gawk-3.1.6a)
>> The result of your addition would need 54 bit.
>> 
>> As long as gawk uses the C-type double you have to live with this error.
>
>This is not an error, but a feature.
>As far as I know, it is intentional that gawk uses 
>a portable data type that produces the same result
>on every machine.

Double isn't necessarily portable (e.g., IBM S/390) but on most modern systems
it is. The reason for use of double is both historical practice and mandate
by POSIX.

Arnold
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