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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.


SEE ALSO

     math(3)


STANDARDS

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

BSD                            December 11, 2006                           BSD

Mac OS X 10.9.1 - Generated Wed Jan 8 07:28:20 CST 2014
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