MirOS Manual: scalbn(3), scalbnf(3)

SCALBN(3)                  BSD Programmer's Manual                   SCALBN(3)


     scalbn, scalbnf - exponent using FLT_RADIX




     #include <math.h>

     scalbn(double x, int n);

     scalbnf(float x, int n);


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


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

           1.   When the result would cause an overflow, a range error occurs
                and +-HUGE_VAL, +-HUGE_VALF, or +-HUGE_VALL is returned ac-
                cording 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.


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


     The described functions conform to ISO/IEC 9899:1999 ("ISO C99").

MirOS BSD #10-current          February 9, 2014                              1

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