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    The following form allows you to view linux man pages.

    Command:

    logbl

    
    
    

    SYNOPSIS

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

    DESCRIPTION

           These functions extract the exponent from the  internal  floating-point
           representation of x and return it as a floating-point value.  The inte-
           ger constant FLT_RADIX, defined in <float.h>, indicates the radix  used
           for  the  system's  floating-point  representation.  If FLT_RADIX is 2,
           logb(x) is equal to floor(log2(x)), except that it is probably  faster.
    
           If  x is subnormal, logb() returns the exponent x would have if it were
           normalized.
    
    
    

    RETURN VALUE

           On success, these functions return the exponent of x.
    
           If x is a NaN, a NaN is returned.
    
           If x is zero, then a  pole  error  occurs,  and  the  functions  return
           -HUGE_VAL, -HUGE_VALF, or -HUGE_VALL, respectively.
    
           If  x is negative infinity or positive infinity, then positive infinity
           is returned.
    
    
    

    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:
    
           Pole error: x is 0
                  A  divide-by-zero  floating-point  exception  (FE_DIVBYZERO)  is
                  raised.
    
                                      2014-02-28                           LOGB(3)
    
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