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Function std.math.exponential.ilogb
Extracts the exponent of x as a signed integral value.
int ilogb(T)
(
const T x
) pure nothrow @nogc @trusted
if (isFloatingPoint!T);
int ilogb(T)
(
const T x
) pure nothrow @nogc @safe
if (isIntegral!T && isUnsigned!T);
int ilogb(T)
(
const T x
) pure nothrow @nogc @safe
if (isIntegral!T && isSigned!T);
If x is not a special value, the result is the same as
cast(int) logb(x)
.
x | ilogb(x) | Range error? |
---|---|---|
0 | FP_ILOGB0 | yes |
±∞ | int.max | no |
NAN | FP_ILOGBNAN | no |
Example
writeln(ilogb(1)); // 0
writeln(ilogb(3)); // 1
writeln(ilogb(3.0)); // 1
writeln(ilogb(100_000_000)); // 26
writeln(ilogb(0)); // FP_ILOGB0
writeln(ilogb(0.0)); // FP_ILOGB0
writeln(ilogb(double .nan)); // FP_ILOGBNAN
writeln(ilogb(double .infinity)); // int.max
Authors
Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw and David Nadlinger
License
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.