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^-logb(x) < FLT_RADIX

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

real logb(real x)
pragma(inline, true) @trusted pure nothrow @nogc
real
logb
(
real x
)
double logb(double x)
float logb(float x)

Examples

assert(logb(1.0) == 0);
assert(logb(100.0) == 6);

assert(logb(0.0) == -real.infinity);
assert(logb(real.infinity) == real.infinity);
assert(logb(-real.infinity) == real.infinity);

logb

Examples

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