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

NAME
     ilogb -- return exponent as an integer value

SYNOPSIS
     ##include <>

     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 FPILOGB0.

     ilogb(]-infinity) returns INTMAX.

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

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

     The special return values FPILOGB0 and FPILOGBNAN are defined in
     math.h, and may differ between platforms.  INTMAX is defined in lim-
     its.h.

SEE ALSO
     math(3)

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

BSD                              July 22, 2003                             BSD