osx man page for ilogbf

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

NAME
     ilogb -- return exponent as an integer value

SYNOPSIS
     #include <math.h>

     int
     ilogb(double x);

     int
     ilogbl(long double x);

     int
     ilogbf(float x);

DESCRIPTION
     The ilogb() functions return the exponent of x as a signed integer value.

SPECIAL VALUES
     ilogb(+-0) returns FP_ILOGB0.

     ilogb(+-infinity) returns INT_MAX.

     ilogb(x) returns FP_ILOGBNAN if x is a NaN.

     A range error may occur if x is 0, +-infinity, or a nan.

     The special return values FP_ILOGB0 and FP_ILOGBNAN are defined in math.h, and may differ between platforms.  INT_MAX is defined in limits.h.

SEE ALSO
     math(3)

STANDARDS
     The ilogb() functions conform to ISO/IEC 9899:2011.

BSD
								 December 11, 2006							       BSD