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    The following form allows you to view linux man pages.

    Command:

    ilogb

    
    
    

    SYNOPSIS

           #include <math.h>
    
           int ilogb(double x);
           int ilogbf(float x);
           int ilogbl(long double x);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           ilogb():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
               _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE ||
               _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
           ilogbf(), ilogbl():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           These functions return the exponent part of their argument as a  signed
           integer.   When  no error occurs, these functions are equivalent to the
           corresponding logb(3) functions, cast to int.
    
    
    

    RETURN VALUE

           On success, these functions return the exponent of x, as a signed inte-
           ger.
    
           If  x  is  zero,  then  a domain error occurs, and the functions return
           FP_ILOGB0.
    
           If x is a NaN, then a domain error occurs,  and  the  functions  return
           FP_ILOGBNAN.
    
           If  x  is  negative  infinity or positive infinity, then a domain error
           occurs, and the functions return INT_MAX.
    
    
    

    ERRORS

           See math_error(7) for information on how to determine whether an  error
           has occurred when calling these functions.
    
           The following errors can occur:
    
           Domain error: x is 0 or a NaN
                  An invalid floating-point exception (FE_INVALID) is raised.
    
                  These functions do not set errno for this case.
    
           Domain error: x is an infinity
    
    
                                      2013-08-06                          ILOGB(3)
    
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