Free Knowledge Resources


Linux Manual Pages


Free Software * Books

Source Code

Free Media

Linux

ecvt(3)


NAME

   ecvt, fcvt - convert a floating-point number to a string

SYNOPSIS

   #include <stdlib.h>

   char *ecvt(double number, int ndigits, int *decpt, int *sign);

   char *fcvt(double number, int ndigits, int *decpt, int *sign);

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

   ecvt(), fcvt():
       Since glibc 2.12:
           (_XOPEN_SOURCE >= 500) ! (_POSIX_C_SOURCE >= 200112L)
               || /* Glibc since 2.19: */ _DEFAULT_SOURCE
               || /* Glibc versions <= 2.19: */ _SVID_SOURCE
       Before glibc 2.12:
           _SVID_SOURCE || _XOPEN_SOURCE >= 500

DESCRIPTION

   The  ecvt()  function  converts  number  to a null-terminated string of
   ndigits digits (where ndigits is reduced  to  a  system-specific  limit
   determined  by the precision of a double), and returns a pointer to the
   string.  The high-order digit is nonzero, unless number is  zero.   The
   low  order  digit  is  rounded.   The  string itself does not contain a
   decimal point; however, the position of the decimal point  relative  to
   the  start  of  the  string  is stored in *decpt.  A negative value for
   *decpt means that the decimal point is to the left of the start of  the
   string.   If  the sign of number is negative, *sign is set to a nonzero
   value, otherwise it is set to 0.  If number is zero, it is  unspecified
   whether *decpt is 0 or 1.

   The  fcvt()  function  is  identical  to  ecvt(),  except  that ndigits
   specifies the number of digits after the decimal point.

RETURN VALUE

   Both the ecvt() and fcvt() functions  return  a  pointer  to  a  static
   string  containing  the  ASCII  representation  of  number.  The static
   string is overwritten by each call to ecvt() or fcvt().

ATTRIBUTES

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

   
   Interface  Attribute      Value               
   
   ecvt()     Thread safety  MT-Unsafe race:ecvt 
   
   fcvt()     Thread safety  MT-Unsafe race:fcvt

CONFORMING TO

   SVr2;  marked  as  LEGACY  in  POSIX.1-2001.   POSIX.1-2008 removes the
   specifications of ecvt() and fcvt(), recommending the use of sprintf(3)
   instead (though snprintf(3) may be preferable).

NOTES

   Not all locales use a point as the radix character ("decimal point").

SEE ALSO

   ecvt_r(3), gcvt(3), qecvt(3), setlocale(3), sprintf(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                           ECVT(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.


birds banner