# scalbn(3)

#### NAME

```   scalbn,  scalbnf,  scalbnl,  scalbln,  scalblnf,  scalblnl  -  multiply
floating-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);

Feature Test Macro Requirements for glibc (see feature_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:

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.

```

#### ATTRIBUTES

```   For  an  explanation  of  the  terms  used   in   this   section,   see
attributes(7).

┌──────────────────────────────────┬───────────────┬─────────┐
│Interface                         │ Attribute     │ Value   │
├──────────────────────────────────┼───────────────┼─────────┤
│scalbn(), scalbnf(), scalbnl(),   │ Thread safety │ MT-Safe │
│scalbln(), scalblnf(), scalblnl() │               │         │
└──────────────────────────────────┴───────────────┴─────────┘
```

#### CONFORMINGTO

```   C99, POSIX.1-2001, POSIX.1-2008.

```

#### 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 4.09 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/.

2016-03-15                        SCALBLN(3)
```

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