Index for Section 3

Alphabetical listing for F

floor(3)
NAME
  floor, ceil, modf, nint,  rint, trunc - Round floating-point numbers to
  floating-point integers, return the nearest integral value, and truncate a
  floating-point number

LIBRARY
  Math Library (libm.a)

SYNOPSIS
  #include <math.h>

  double floor	 (double x);
  float	 floorf	 (float	 x);
  double ceil	 (double x);
  float	 ceilf	 (float	 x);
  double modf	 (double x, double *n);
  float	 modff	 (float	 x, float  *n);
  double nint	 (double x);
  float	 nintf	 (float	 x);
  double rint	 (double x);
  float	 rintf	 (float	 x);
  double trunc	 (double x);
  float	 truncf	 (float	 x);

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  floor():  XPG4

  ceil():  XPG4

  modf():  XPG4

  rint():  XPG4-UNIX

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

DESCRIPTION
  The floor() and floorf() functions return the largest floating-point
  integer value less than or equal to  x.

  The ceil() and ceilf() functions return the smallest floating-point integer
  value greater than or equal to  x.

  The modf() and modff() functions split a floating-point number x into a
  fractional part f and an integer part i such that |f| < 1.0 and (f + i) =
  x.  Both f and i have the same sign as x.  The modf() and modff() functions
  return f and store i into the location pointed to by n.

  The nint() and nintf() functions return the nearest integral value to x,
  except halfway cases are rounded to the integral value larger in magnitude.
  This corresponds to the FORTRAN generic intrinsic function nint().

  The rint() and rintf() functions round x to an integral value according to
  the current IEEE rounding direction specified by the user.

  The trunc() and truncf() functions truncate x to an integral value.