# scalbl(3m) [opensolaris man page]

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

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

c99 [ flag... ] file...[ 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);-lmDESCRIPTION

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, 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).-InfERRORS

These functions will fail if: Domain Error If x is 0 and n is +Inf, or x is Inf and n isIf 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.-Inf.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 5.1112 Jul 2006 scalb(3M)

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

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

cc [ flag... ] file...[ 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);-lmDESCRIPTION

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, 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).-InfERRORS

These functions will fail if: Domain Error If x is 0 and n is +Inf, or x is Inf and n isIf 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.-Inf.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 5.101 Nov 2003 scalb(3M)