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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 lim-its.h. limits.h.
     its.h.

SEE ALSO
     math(3)

STANDARDS
     The ilogb() functions conform to ISO/IEC 9899:1999(E).

BSD                              July 22, 2003                             BSD