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Converting decimal to/from IEEE hex format

Can anyone tell me how to convert a number to/from the corresponding
IEEE hex floating-point representation in either 32 or 64 bits in
Mathematica?  For
example, I would want to convert 1.0 into 3F800000 (32-bit) or
3FF0000000000000 (64-bit), and vice-versa.  (When converting from
decimal to hex, if the number is not exactly representable, I would
want the nearest floating-point number.)  Thanks, Robert

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