scalb(3m) [opensolaris man page]

scalb(3M)						  Mathematical Library Functions						 scalb(3M)

NAME

       scalb, scalbf, scalbl - load exponent of a radix-independent floating-point number

SYNOPSIS

       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double scalb(double x, double n);

       float scalbf(float x, float n);

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

DESCRIPTION

       These  functions  compute  x  * r^n, where r is the radix of the machine's floating point arithmetic. When r is 2, scalb() is equivalent to
       ldexp(3M). The value of r is FLT_RADIX which is defined in <float.h>.

RETURN VALUES

       Upon successful completion, the scalb() function returns x * r^n.

       If x or n is NaN, a NaN is returned.

       If n is 0, x is returned.

       If x is +-Inf and n is not -Inf, x is returned.

       If x is +-0 and n is not +Inf, x is returned.

       If x is +-0 and n is +Inf, a domain error occurs and a NaN is returned.

       If x is +-Inf and n is -Inf, a domain error occurs and a NaN is returned.

       If the result would cause an overflow, a range error occurs and +-HUGE_VAL (according to the sign of x) is returned.

       For exceptional cases, matherr(3M) tabulates the values to be returned by scalb() as specified by SVID3 and XPG3. See standards(5).

ERRORS

       These functions will fail if:

       Domain Error    If x is 0 and n is +Inf, or x is Inf and n is -Inf.

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

       Range Error     The result would overflow.

		       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	     |See below.		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

       The scalb() function is Standard. The scalbf() and scalbl() functions are Stable.

SEE ALSO

       feclearexcept(3M), fetestexcept(3M), ilogb(3M), ldexp(3M), logb(3M), math.h(3HEAD), matherr(3M), scalbln(3M), attributes(5), standards(5)

SunOS 5.11							    12 Jul 2006 							 scalb(3M)

Check Out this Related Man Page

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

NAME

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

SYNOPSIS

       c99 [ 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 5.11							    12 Jul 2006 						       scalbln(3M)

Linux and UNIX Man Pages

scalb(3m) [opensolaris man page]

Check Out this Related Man Page