rint

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

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.

real rint(real x)
pragma(inline, true) @safe pure nothrow @nogc
real
rint
(
real x
)
double rint(double x)
float rint(float x)

Examples

import std.math.traits : isNaN;

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

assert(rint(0.5) == 0);
assert(rint(0.6) == 1);
assert(rint(100.0) == 100);

assert(isNaN(rint(real.nan)));
assert(rint(real.infinity) == real.infinity);
assert(rint(-real.infinity) == -real.infinity);

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See Implementation

std math rounding functions