Mathematical Library Functions                        scalbln(3M)



NAME
     scalbln, scalblnf, scalblnl, scalbn, scalbnf, scalbnl - com-
     pute exponent using FLTRADIX

SYNOPSIS
     c99 [ flag... ] file... -lm [ library... ]
     #include 

     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  *  FLTRADIX^n  efficiently,  not
     normally by computing FLTRADIX^n explicitly.

RETURN VALUES
     Upon successful  completion,  these  functions  return  x  *
     FLTRADIX^n>.


     If the result would cause overflow, a range error occurs and
     these functions return ]HUGEVAL, ]HUGEVALF, and ]HUGEVAL
     (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.

ERORS
     These functions will fail if:




SunOS 5.11          Last change: 12 Jul 2006                    1






Mathematical Library Functions                        scalbln(3M)



     Range Error    The result overflows.

                    If the integer expression (matherrhandling &
                    MATHEREXCEPT)  is  non-zero, then the over-
                    flow floating-point exception is raised.


USAGE
     An application wanting to check for exceptions  should  call
     feclearexcept(FEALEXCEPT) before calling these functions.
     On  return,  if  fetestexcept(FEINVALID    FEDIVBYZERO  
     FEOVERFLOW    FEUNDERFLOW)  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.

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE 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          Last change: 12 Jul 2006                    2