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Returns next representable neighbor.

double _nextafter(
   double x,
   double y 


x, y
Double-precision floating-point values.

Return Value

If x=y, _nextafter returns x, with no exception triggered. If either x or y is a quiet NaN, then the return value is one or the other of the input NaNs.


The _nextafter function returns the closest representable neighbor of x in the direction toward y.


Routine Required header Compatibility
_nextafter <float.h> Win 98, Win Me, Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.


All versions of the C run-time libraries.

See Also

Floating-Point Support Routines | _isnan | Run-Time Routines and .NET Framework Equivalents

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