# scalb(3)

#### NAME

```   scalb,  scalbf,  scalbl  -  multiply  floating-point number by integral

```

#### SYNOPSIS

```   #include <math.h>

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

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

scalb():
_XOPEN_SOURCE >= 500
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
scalbf(), scalbl():
_XOPEN_SOURCE >= 600
|| /* 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 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.

```

#### ATTRIBUTES

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

Interface                     Attribute      Value

scalb(), scalbf(), scalbl()   Thread safety  MT-Safe

```

#### 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 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                          SCALB(3)
```

## Opportunity

Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

## Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

## Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.

## Education

Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.