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ILOGB(3)		 BSD Library Functions Manual		      ILOGB(3)

NAME
     ilogb, ilogbf, ilogbl, logb, logbf, logbl — extract exponent

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     int
     ilogb(double x);

     int
     ilogbf(float x);

     int
     ilogbl(long double x);

     double
     logb(double x);

     float
     logbf(float x);

     long double
     logbl(long double x);

DESCRIPTION
     ilogb(), ilogbf() and ilogbl() return x's exponent in integer format.
     ilogb(±∞) returns INT_MAX, ilogb(±NaN) returns FP_ILOGBNAN, and ilogb(0)
     returns FP_ILOGB0.

     logb(x), logbf(x), and logbl(x) return x's exponent in floating-point
     format with the same precision as x.  logb(±∞) returns +∞, and logb(0)
     returns -∞ with a division by zero exception.

SEE ALSO
     frexp(3), ieee(3), math(3), scalbn(3)

STANDARDS
     The ilogb(), ilogbf(), ilogbl(), logb(), logbf(), and logbl() routines
     conform to ISO/IEC 9899:1999 (“ISO C99”).	The latter three implement the
     logb function recommended by IEEE Std 754-1985.

HISTORY
     Function	First Appeared In
     logb()	4.3BSD
     ilogb()	FreeBSD 1.1.5
     ilogbf()	FreeBSD 2.0
     logbf()	FreeBSD 2.0
     ilogbl()	FreeBSD 5.4
     logbl()	FreeBSD 8.0

BSD			       December 16, 2007			   BSD
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