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#### 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, double exp);
long double scalbl(long double x, double exp);

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

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

```

#### DESCRIPTION

```       These  functions multiply their first argument x by FLT_RADIX (probably 2) to the power of
exp, that is:

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

```

#### RETURNVALUE

```       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 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

```       See 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.

```

#### CONFORMINGTO

```       scalb() 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.

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

```

#### SEEALSO

```       ldexp(3), scalbln(3)

```

#### COLOPHON

```       This  page  is  part of release 3.35 of the Linux man-pages project.  A description of the
project, and information about reporting bugs, can be found at  http://man7.org/linux/man-
pages/.

2010-09-20                                   SCALB(3)
```