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ilogbf(3)

NAME

     ilogb, ilogbf, ilogbl -- extract exponent

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     int
     ilogb(double x);

     int
     ilogbf(float x);

     int
     ilogbl(long double x);

DESCRIPTION

     ilogb(), ilogbf() and ilogbl() return x's exponent, in integer format.
     ilogb(+-infinity) returns INT_MAX, ilogb(+-NaN) returns FP_ILOGBNAN and
     ilogb(0) returns FP_ILOGB0.

SEE ALSO

     frexp(3), ieee(3), math(3), scalbn(3)

STANDARDS

     The ilogb(), ilogbf(), and ilogbl() routines conform to ISO/IEC 9899:1999
     (``ISO C99'').  They provide functionality similar to the Logb function
     recommended by IEEE Std 754-1985.

HISTORY

     The ilogb() and ilogbf() functions appeared in 4.3BSD and FreeBSD 2.0,
     respectively.

FreeBSD 5.4		       January 26, 2005 		   FreeBSD 5.4

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