ilogb(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
SPONSORED LINKS
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