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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

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.