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ECVT(3)                    Linux Programmer's Manual                   ECVT(3)

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

       #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(): _SVID_SOURCE || _XOPEN_SOURCE >= 500

       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 deci-
       mal 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 speci-
       fies the number of digits after the decimal point.

       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().

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

       Linux libc4 and libc5 specified the type of ndigits as size_t.  Not all
       locales use a point as the radix character ("decimal point").

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

       This  page  is  part of release 3.25 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

                                  2009-03-15                           ECVT(3)

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