ilogb

Extracts the exponent of x as a signed integral value.

If x is not a special value, the result is the same as cast(int) logb(x).

Special Values
x	ilogb(x)	Range error?
0	FP_ILOGB0	yes
±∞	int.max	no
NaN	FP_ILOGBNAN	no

int ilogb(T x)
@trusted pure nothrow @nogc
int
ilogb
(
T
)
(
const T x
)
if (
isFloatingPoint!T
)
int ilogb(T x)
int ilogb(T x)

Examples

assert(ilogb(1) == 0);
assert(ilogb(3) == 1);
assert(ilogb(3.0) == 1);
assert(ilogb(100_000_000) == 26);

assert(ilogb(0) == FP_ILOGB0);
assert(ilogb(0.0) == FP_ILOGB0);
assert(ilogb(double.nan) == FP_ILOGBNAN);
assert(ilogb(double.infinity) == int.max);

Meta

Source

See Implementation

std math exponential aliases

functions