Compiler Library/XL Reference Manual (32650-90029)

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Infinity can also be encoded in the real number format as follows:
When all exponent bits are set to 1 and all of the fraction bits are
set to 0, there is an Infinity: (-1)Sign Infinity. For example:
Exponent = 255; fraction = 0
Longreal
Range:
[-1.797693134862316 x 10308 ,-4.940656458412465 x 10-324 ] and
0.0 and
[4.940656458412465 x 10-324 ,1.797693134862316 x 10308 ] in eight bytes
(concatenated)
Representation: