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NetBSD 6.1.5 - man page for scalbnl (netbsd section 3)

SCALBN(3)			   BSD Library Functions Manual 			SCALBN(3)

NAME
     scalbn, scalbnf, scalbnl -- exponent using FLT_RADIX

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     scalbn(double x, int n);

     float
     scalbnf(float x, int n);

     long double
     scalbnl(long double x, int n);

DESCRIPTION
     The scalbn(), scalbnf(), and scalbnl() functions compute x * r^n, where r is the radix of
     the machine's floating point arithmetic, defined by the FLT_RADIX constant in <float.h>.
     The rationale is efficiency; r^n is not computed explicitly.

RETURN VALUES
     As described above, upon successful completion, the described functions return the exponent
     computed using FLT_RADIX.	Otherwise the following may occur:

	   1.	When the result would cause an overflow, a range error occurs and +-HUGE_VAL,
		+-HUGE_VALF, or +-HUGE_VALL is returned according to the sign of x and the return
		type of the corresponding function.

	   2.	When the correct value would cause an underflow and it is not representable, a
		range error occurs and either 0.0 or an implementation-defined value is returned.
		When an underflow occurs but the correct value is representable, a range error
		occurs but the correct value is returned.

	   3.	If x is +-0 or +-Inf, x is returned.  Likewise, if n is zero, x is returned.  If
		x is NaN, NaN is returned.

SEE ALSO
     exp(3), frexp(3), ldexp(3), math(3)

STANDARDS
     The described functions conform to ISO/IEC 9899:1999 (``ISO C99'').

BSD					September 18, 2011				      BSD


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