phobos ~master (2024-10-03T07:50:27Z)

scalbn

std math exponential

Efficiently calculates x * 2n.

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

Special Values
xscalb(x)
$(PLUSMNINF)$(PLUSMNINF)
±0.0±0.0
  1. real scalbn(real x, int n)
  2. double scalbn(double x, int n)
  3. float scalbn(float x, int n)
    pragma(inline, true) @safe pure nothrow @nogc
    float
    scalbn
    (
    float x
    ,
    int n
    )

Examples

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

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std math exponential aliasesfunctions

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