SCALBLN(3)Linux Programmer's ManualSCALBLN(3)NAME scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl - multiply float- ing-point number by integral power of radix SYNOPSIS #include <math.h> double scalbln(double x, long int exp); float scalblnf(float x, long int exp); long double scalblnl(long double x, long int exp); double scalbn(double x, int exp); float scalbnf(float x, int exp); long double scalbnl(long double x, int exp); Link with -lm. Feature Test Macro Requirements for glibc (seefeature_test_macros(7)): scalbln(), scalblnf(), scalblnl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE scalbn(), scalbnf(), scalbnl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* 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 is a NaN, a NaN is returned. If x is positive infinity (negative infinity), positive infinity (nega- tive infinity) is returned. If x is +0 (-0), +0 (-0) 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 return 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: 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. VERSIONS These functions first appeared in glibc in version 2.1. ATTRIBUTES For an explanation of the terms used in this section, seeattributes(7). +----------------------------------+---------------+---------+ |Interface | Attribute | Value | +----------------------------------+---------------+---------+ |scalbn(), scalbnf(), scalbnl(), | Thread safety | MT-Safe | |scalbln(), scalblnf(), scalblnl() | | | +----------------------------------+---------------+---------+ CONFORMING TO C99, POSIX.1-2001, POSIX.1-2008. NOTES These functions differ from the obsolete functions described inscalb(3)in the type of their second argument. The functions described on this page have a second argument of an integral type, while those inscalb(3)have a second argument of type double. If FLT_RADIX equals 2 (which is usual), then scalbn() is equivalent toldexp(3). SEE ALSOldexp(3),scalb(3)COLOPHON This page is part of release 4.15 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/. 2017-09-15SCALBLN(3)