[fitsbits] 64-bit integers

[Thierry Forveille]

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.