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OpenDarwin 7.2.1 - man page for logb (opendarwin section 3)

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LOGB(3) 			   BSD Library Functions Manual 			  LOGB(3)

NAME
     logb -- return exponent as a floating-point number

SYNOPSIS
     #include <math.h>

     double
     logb(double x);

     float
     logbf(float x);

DESCRIPTION
     The logb() and logbf() functions return the exponent of x, represented as a floating-point
     number.

SPECIAL VALUES
     logb(+-0) returns -infinity and raises the "divide-by-zero" floating-point exception.

     logb(+-infinity) returns +infinity.

SEE ALSO
     ilogb(3)

STANDARDS
     The logb() and logbf() functions conform to ISO/IEC 9899:1999(E).

BSD					  July 24, 2003 				      BSD
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