View source code
Display the source code in std/math/exponential.d from which this page was generated on github.
Report a bug
If you spot a problem with this page, click here to create a Bugzilla issue.
Improve this page
Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone.

Function std.math.exponential.scalbn

Efficiently calculates x * 2n.

real scalbn (
  real x,
  int n
) pure nothrow @nogc @safe;

double scalbn (
  double x,
  int n
) pure nothrow @nogc @safe;

float scalbn (
  float x,
  int n
) pure nothrow @nogc @safe;

scalbn handles underflow and overflow in the same fashion as the basic arithmetic operators.

Special Values
x scalb(x)
±∞ ±∞
±0.0 ±0.0

Example

writeln(scalbn(0x1.2345678abcdefp0L, 999)); // 0x1.2345678abcdefp999L
writeln(scalbn(-real.infinity, 5)); // -real.infinity
writeln(scalbn(2.0, 10)); // 2048.0
writeln(scalbn(2048.0f, -10)); // 2.0f

Authors

Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw and David Nadlinger

License

Boost License 1.0.