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NAME

scalb, scalbf, scalbl - multiply floating-point number
by integral power of radix (OBSOLETE)
 

SYNOPSIS

double scalb(double x, double exp);
float scalbf(float x, double exp);
long double scalbl(long double x, double exp);

Link with -lm.

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

scalb(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500
scalbf(), scalbl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600  

DESCRIPTION

    x * FLT_RADIX ** exp

The definition of FLT_RADIX can be obtained by including <float.h>.  

RETURN VALUE

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 occurs, 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 return zero, with a sign the same as x.  

ERRORS

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 TO

scalbf() and scalbl() are unstandardized; scalbf() is nevertheless present on several other systems  

SEE ALSO

COLOPHON

Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

ERRORS

CONFORMING TO

SEE ALSO

COLOPHON

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