Index for Section 3

Alphabetical listing for I

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ilogb(3)
NAME
  ilogb - Returns an unbiased exponent

LIBRARY
  Math Library (libm.a)

SYNOPSIS
  #include <math.h>

  int ilogb  (double x);
  int ilogbf (float  x);
  int ilogbl  (long double x);

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

  ilogb():  XPG4-UNIX

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

DESCRIPTION
  The ilogb(), ilogbf(), and ilogbl() functions return the integral part of
  the base r  logarithm of (|x|) as a signed integral value for non-zero x,
  where r is the radix of the machine's floating point arithmetic.

  The following table describes function behavior in response to exceptional
  arguments:

  ____________________________________________________________________
  Function		       Exceptional Argument   Routine Behavior
  ____________________________________________________________________
  ilogb(), ilogbf() ilogbl()   |x| = infinity	      INT_MAX
  ilogb(), ilogbf() ilogbl()   x = 0, NaN	      INT_MIN
  ____________________________________________________________________

Index for Section 3

Alphabetical listing for I

Top of page