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RINT(3M)                                                              RINT(3M)



NAME
       aint,  anint,  ceil, floor, rint, irint, nint - round to integral value
       in floating-point or integer format

SYNOPSIS
       #include <&lt;math.h>&gt;

       double aint(x)
       double x;

       double anint(x)
       double x;

       double ceil(x)
       double x;

       double floor(x)
       double x;

       double rint(x)
       double x;

       int irint(x)
       double x;

       int nint(x)
       double x;

DESCRIPTION
       aint(), anint(), ceil(), floor(), and rint()  convert  a  double  value
       into  an integral value in double format.  They vary in how they choose
       the result when the argument is not already an integral value.  Here an
       "integral value" means a value of a mathematical integer, which however
       might be too large to fit in a particular computer's int  format.   All
       sufficiently  large  values  in  a particular floating-point format are
       already integral; in IEEE double-precision format, that means all  val-
       ues  >=  2**52.  Zeros, infinities, and quiet NaNs are treated as inte-
       gral values by these functions, which always preserve their  argument's
       sign.

       aint()  returns  the  integral  value between x and 0, nearest x.  This
       corresponds to IEEE rounding toward zero and  to  the  Fortran  generic
       intrinsic function aint().

       anint()  returns  the nearest integral value to x, except halfway cases
       are rounded to the integral value larger  in  magnitude.   This  corre-
       sponds to the Fortran generic intrinsic function anint().

       ceil()  returns  the  least  integral value greater than or equal to x.
       This corresponds to IEEE rounding toward positive infinity.

       floor() returns the greatest integral value less than or  equal  to  x.
       This corresponds to IEEE rounding toward negative infinity.

       rint()  rounds  x  to  an  integral value according to the current IEEE
       rounding direction.

       irint() converts x into int format according to the current IEEE round-
       ing direction.

       nint()  converts  x  into int format rounding to the nearest int value,
       except halfway cases are rounded to the int value larger in  magnitude.
       This corresponds to the Fortran generic intrinsic function nint().



                                15 October 1987                       RINT(3M)