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scalb(3) [osx man page]

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

scalbn, scalbln SYNOPSIS
#include <math.h> double scalbn(double x, int n); long double scalbnl(long double x, int n); float scalbnf(float x, int n); double scalbln(double x, long int n); long double scalblnl(long double x, long int n); float scalblnf(float x, long int n); DESCRIPTION
The scalbn() , and scalbln() functions return x*(2**n) computed by exponent manipulation. SPECIAL VALUES
scalbn(+-0, n) returns +-0. scalbn(x, 0) returns x. scalbn(+-infinity, n) returns +-infinity. scalbln() has the same special values. NOTE
The scalb() function is deprecated. scalbn() should be used instead. VECTOR OPERATIONS
If you need to apply the scalbn() functions to SIMD vectors or arrays, using the following function provided by the Accelerate.framework may give significantly better performance: #include <Accelerate/Accelerate.h> vFloat vscalbf(vFloat x, vSInt32); SEE ALSO
math(3), ldexp(3) STANDARDS
The scalbn() and scalbln() functions conform to ISO/IEC 9899:2011. BSD
July 02, 2008 BSD

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

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)
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