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#### NAME

```       scalbn,  scalbnf, scalbnl, scalbln, scalblnf, scalblnl - multiply floating-point number by

```

#### 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);

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

scalbln(), scalblnf(), scalblnl():
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99
scalbn(), scalbnf(), scalbnl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or cc -std=c99

```

#### 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 is a NaN, a NaN is returned.

If x is positive infinity (negative infinity), positive infinity  (negative  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

```       See  math_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.

```

#### CONFORMINGTO

```       C99, POSIX.1-2001.

```

#### NOTES

```       These functions differ from the obsolete functions described in scalb(3) in  the  type  of
their  second argument.  The functions described on this page have a second argument of an
integral type, while those in scalb(3) have a second argument of type double.

If FLT_RADIX equals 2 (which is usual), then scalbn() is equivalent to ldexp(3).

```

#### SEEALSO

```       ldexp(3), scalb(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                                 SCALBLN(3)
```