SCALB(3)Linux Programmer's ManualSCALB(3)NAME scalb, scalbf, scalbl - multiply floating-point number by integral power of radix (OBSOLETE) SYNOPSIS #include <math.h> double scalb(double x, double exp); float scalbf(float x, float exp); long double scalbl(long double x, long double exp); Link with -lm. Feature Test Macro Requirements for glibc (seefeature_test_macros(7)): scalb(): _XOPEN_SOURCE >= 500 || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE scalbf(), scalbl(): _XOPEN_SOURCE >= 600 || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE DESCRIPTION These 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 VALUE On success, these functions return x * FLT_RADIX ** exp. If x or exp is a NaN, a NaN is returned. If x is positive infinity (negative infinity), and exp is not negative infinity, positive infinity (negative infinity) is returned. If x is +0 (-0), and exp is not positive infinity, +0 (-0) is returned. If x is zero, and exp is positive infinity, a domain error occurs, and a NaN is returned. If x is an infinity, and exp is negative infinity, a domain error oc- curs, and a NaN is returned. If the result overflows, a range error occurs, and the functions return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively, with a sign the same as x. If the result underflows, a range error occurs, and the functions re- turn zero, with a sign the same as x. ERRORS Seemath_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. ATTRIBUTES For an explanation of the terms used in this section, see at-tributes(7). +-----------------------------+---------------+---------+ |Interface | Attribute | Value | +-----------------------------+---------------+---------+ |scalb(), scalbf(), scalbl() | Thread safety | MT-Safe | +-----------------------------+---------------+---------+ CONFORMING TO scalb() is specified in POSIX.1-2001, but marked obsolescent. POSIX.1-2008 removes the specification of scalb(), recommending the use ofscalbln(3),scalblnf(3), orscalblnl(3)instead. The scalb() func- tion is from 4.3BSD. scalbf() and scalbl() are unstandardized; scalbf() is nevertheless present on several other systems SEE ALSOldexp(3),scalbln(3)COLOPHON This page is part of release 5.05 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2017-09-15SCALB(3)