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       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
       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.


       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
       specifications 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)


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