scalbn(3) [freebsd man page]

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

NAME

     scalbln, scalblnf, scalblnl, scalbn, scalbnf, scalbnl -- adjust exponent

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     double
     scalbln(double x, long n);

     float
     scalblnf(float x, long n);

     long double
     scalblnl(long double x, long n);

     double
     scalbn(double x, int n);

     float
     scalbnf(float x, int n);

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

DESCRIPTION

     These routines return x*(2**n) computed by exponent manipulation.

SEE ALSO

     ieee(3), math(3)

STANDARDS

     These routines conform to ISO/IEC 9899:1999 (``ISO C99''), and they implement the Scalb function recommended by IEEE Std 754-1985.

HISTORY

     The scalbn() and scalbnf() functions appeared in 4.3BSD and FreeBSD 2.0, respectively.  The scalbln() and scalblnf() functions first appeared
     in FreeBSD 5.3, and scalblnl() and scalbln() in FreeBSD 6.0.

BSD
								   March 4, 2005							       BSD

scalbln(3M)						  Mathematical Library Functions					       scalbln(3M)

NAME

       scalbln, scalblnf, scalblnl, scalbn, scalbnf, scalbnl - compute exponent using FLT_RADIX

SYNOPSIS

       cc [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double scalbln(double x, long n);

       float scalblnf(float x, long n);

       long double scalblnl(long double x, long n);

       double scalbn(double x, int n);

       float scalbnf(float x, int n);

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

DESCRIPTION

       These functions compute x * FLT_RADIX**n efficiently, not normally by computing FLT_RADIX**n explicitly.

RETURN VALUES

       Upon successful completion, these functions return x * FLT_RADIX**n.

       If  the result would cause overflow, a range error occurs and these functions return +-HUGE_VAL, +-HUGE_VALF, and +-HUGE_VALL (according to
       the sign of x) as appropriate for the return type of the function.

       If x is NaN, a NaN is returned.

       If x is +-0 or +-Inf, x is returned.

       If x is 0, x is returned.

ERRORS

       These functions will fail if:

       Range Error     The result overflows.

		       If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the overflow  floating-point  exception	is
		       raised.

USAGE

       An  application	wanting  to  check  for  exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if
       fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception  has  been  raised.  An  application  should
       either examine the return value or check the floating point exception flags to detect exceptions.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       feclearexcept(3M), fetestexcept(3M), math.h(3HEAD), scalb(3M), attributes(5), standards(5)

SunOS 5.10							    1 Sep 2002							       scalbln(3M)