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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


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


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


Boost License 1.0.