std::scalbn, std::scalbln

 

C++

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Common mathematical functions

Functions
Basic operations
abs(int) labs llabs imaxabs (C++11) abs(float) fabs div ldiv lldiv imaxdiv (C++11) fmod	remainder (C++11) remquo (C++11) fma (C++11) fmax (C++11) fmin (C++11) fdim (C++11) nan nanf nanl (C++11) (C++11) (C++11)
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sqrt cbrt (C++11)	hypot (C++11) pow
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sin cos tan asin acos atan atan2	sinh cosh tanh asinh (C++11) acosh (C++11) atanh (C++11)
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erf (C++11) erfc (C++11)	lgamma (C++11) tgamma (C++11)
Nearest integer floating point operations
ceil floor round lround llround (C++11) (C++11) (C++11)	trunc (C++11) nearbyint (C++11) rint lrint llrint (C++11) (C++11) (C++11)
Floating point manipulation functions
ldexp scalbn scalbln (C++11) (C++11) ilogb (C++11) logb (C++11)	frexp modf nextafter nexttoward (C++11) (C++11) copysign (C++11)
Classification
fpclassify (C++11) isfinite (C++11) isinf (C++11)	isnan (C++11) isnormal (C++11) signbit (C++11)
Macro constants
HUGE_VALF HUGE_VAL HUGE_VALL (C++11) (C++11) INFINITY (C++11) NAN (C++11) math_errhandling MATH_ERRNO MATH_ERREXCEPT (C++11)	FP_NORMAL FP_SUBNORMAL FP_ZERO FP_INFINITE FP_NAN (C++11) (C++11) (C++11) (C++11) (C++11) FLT_EVAL_METHOD (C++11)

 

Defined in header <cmath>
float       scalbn( float x, int exp );		(since C++11)
double      scalbn( double x, int exp );		(since C++11)
long double scalbn( long double x, int exp );		(since C++11)
double      scalbn( Integral x, int exp );		(since C++11)
float       scalbln( float x, long exp );		(since C++11)
double      scalbln( double x, long exp );		(since C++11)
long double scalbln( long double x, long exp );		(since C++11)
double      scalbln( Integral x, long exp );		(since C++11)

Multiplies an floating point value x by FLT_RADIX raised to power exp. On binary system it is equivalent to ldexp()

Parameters

arg	-	floating point value
exp	-	integer value

Return value

returns x×FLT_RADIX^exp

If the result is too large for the underlying type, range error occurs and HUGE_VAL is returned.

See also

frexp	decomposes a number into significand and a power of 2 (function)
ldexp	multiplies a number by 2 raised to a power (function)