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Function std.math.rounding.rint

Rounds x to the nearest integer value, using the current rounding mode.

real rint (
  real x
) pure nothrow @nogc @safe;

double rint (
  double x
) pure nothrow @nogc @safe;

float rint (
  float x
) pure nothrow @nogc @safe;

If the return value is not equal to x, the FE_INEXACT exception is raised.

nearbyint performs the same operation, but does not set the FE_INEXACT exception.


import std.math.traits : isNaN;

version (IeeeFlagsSupport) resetIeeeFlags();
writeln(rint(0.4)); // 0
version (IeeeFlagsSupport) assert(ieeeFlags.inexact);

writeln(rint(0.5)); // 0
writeln(rint(0.6)); // 1
writeln(rint(100.0)); // 100

writeln(rint(real.infinity)); // real.infinity
writeln(rint(-real.infinity)); // -real.infinity


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


Boost License 1.0.