|SCALB(3)||Linux Programmer's Manual||SCALB(3)|
NAMEscalb, scalbf, scalbl - multiply floating-point number by integral power of radix (OBSOLETE)
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
DESCRIPTIONThese functions multiply their first argument x by FLT_RADIX (probably 2) to the power of exp, that is:
x * FLT_RADIX ** exp
The definition of FLT_RADIX can be obtained by including <float.h>.
RETURN VALUEOn success, these functions return x * FLT_RADIX ** exp.
ERRORSSee math_error(7) for information on how to determine whether an error has occurred when calling these functions.
The following errors can occur:
- Domain error: x is 0, and exp is positive infinity, or x is positive infinity and exp is negative infinity and the other argument is not a NaN
- An invalid floating-point exception ( FE_INVALID) is raised.
- Range error, overflow
- An overflow floating-point exception ( FE_OVERFLOW) is raised.
- Range error, underflow
- An underflow floating-point exception ( FE_UNDERFLOW) is raised.
These functions do not set errno.
CONFORMING TOscalb() is specified in POSIX.1-2001, but marked obsolescent. POSIX.1-2008 removes the specification of scalb(), recommending the use of scalbln(3), scalblnf(3), or scalblnl(3) instead. The scalb() function is from 4.3BSD.
SEE ALSOldexp(3), scalbln(3)
COLOPHONThis page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.