Index for Section 3

Alphabetical listing for F

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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

SYNOPSIS
  #include <math.h>

  double floor(
	  double x );

  float floorf(
	  float x );

  long double floorl(
	  long double x );

  double ceil(
	  double x );

  float ceilf(
	  float x );

  long double ceill(
	  long double x );

  double modf(
	  double x,
	  double *n );

  float modff(
	  float x,
	  float *n );

  long double modfl(
	  long double x,
	  long double *n );

  double nint(
	  double x );

  float nintf(
	  float x );

  long double nintl(
	  long double x );

  double rint(
	  double x );

  float rintf(
	  float x );

  long double rintl(
	  long double x );

  double trunc(
	  double x );

  float truncf(
	  float x );

  long double truncl(
	  long double x );

LIBRARY
  Math Library (libm)

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

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

  The modf(), modff(), and modfl() 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(), modff(), and
  modfl() functions return f and store i into the location pointed to by n.

  The nint(), nintf(), and nintl() 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(), rintf(),	and rintl() functions round x to an integral value
  according to the current IEEE rounding direction specified by the user.

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

Index for Section 3

Alphabetical listing for F

Top of page