H.2 Byte Patterns

Table H.2 shows the types of IEEE floating point value, whether regular or special, corresponding to all double and single precision hexadecimal byte patterns.

 

+0 0000000000000000 00000000

denormalized 0000000000000001 00000001

to to

000FFFFFFFFFFFFF 007FFFFF

positive underflow 0010000000000000 00800000

positive numbers 0010000000000001 00800001

to to

7FEFFFFFFFFFFFFE 7F7FFFFE

positive overflow 7FEFFFFFFFFFFFFF 7F7FFFFF

$$+\infty$$ 7FF0000000000000 7F800000

NaN¹ 7FF0000000000001 7F800001

to to

7FFFFFFFFFFFFFFF 7FFFFFFF

-0 8000000000000000 80000000

negative 8000000000000001 80000001

denormalized to to

800FFFFFFFFFFFFF 807FFFFF

negative underflow 8010000000000000 80800000

negative numbers 8010000000000001 80800001

to to

FFEFFFFFFFFFFFFE FF7FFFFE

negative overflow FFEFFFFFFFFFFFFF FF7FFFFF

$$-\infty$$ FFF0000000000000 FF800000

NaN¹ FFF0000000000001 FF800001

to to

FFFFFFFFFFFFFFFF FFFFFFFF

¹ Certain values may be designated as quiet NaN (no diagnostic when used) or signaling (produces diagnostic when used) by particular implementations.