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Function std.math.operations.nextDown
Calculate the next smallest floating point value before x.
real nextDown
(
real x
) pure nothrow @nogc @safe;
double nextDown
(
double x
) pure nothrow @nogc @safe;
float nextDown
(
float x
) pure nothrow @nogc @safe;
Return the greatest number less than x that is representable as a real; thus, it gives the previous point on the IEEE number line.
x | nextDown(x) |
---|---|
∞ | real.max |
±0.0 | -real.min_normal*real.epsilon |
-real.max | -∞ |
-∞ | -∞ |
NAN | NAN |
Example
writeln(nextDown(1.0 + real .epsilon)); // 1.0
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.