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[fitsbits] 64-bit integers



 
 
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  #11  
Old May 5th 05, 12:33 AM
Thierry Forveille
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William Pence writes:
- some languages only support signed 64-bit integers, and do not natively
support unsigned 64-bit integers (e.g., Fortran and Java, I think). In
these systems integer values greater than 2**63 would appear as negative
values. Software applications that must support the full range of unsigned
64-bit integers could probably be written to test for any negative values,
and then reinterpret the value as the correct unsigned value.

In a sense that's not a new problem, since we already have that situation
for BITPIX=16 and 32. For Fortran at least, not sure about Java.
 




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