logb

Extracts the exponent of x as a signed integral value.

If x is subnormal, it is treated as if it were normalized. For a positive, finite x:

1 <= x * FLT_RADIX$(SUP -logb(x)) < FLT_RADIX

Special Values
xlogb(x)divide by 0?
±∞+∞no
±0.0-∞yes
real
logb
(
real x
)

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