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

       gcvt - convert a floating-point number to a string

       #include <stdlib.h>

       char *gcvt(double number, int ndigit, char *buf);

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

           Since glibc 2.12:
               _SVID_SOURCE ||
                   (_XOPEN_SOURCE >= 500 ||
                       _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) &&
                   !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
           Before glibc 2.12:
               _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE &&

       The gcvt() function converts number to a minimal length null-terminated
       ASCII string and stores the result in buf.  It produces ndigit signifi-
       cant digits in either printf(3) F format or E format.

       The gcvt() function returns the address of the  string  pointed  to  by

       Marked  as LEGACY in POSIX.1-2001.  POSIX.1-2008 removes the specifica-
       tion of gcvt(), recommending the  use  of  sprintf(3)  instead  (though
       snprintf(3) may be preferable).

       ecvt(3), fcvt(3), sprintf(3)

       This  page  is  part of release 3.74 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

                                  2014-05-28                           GCVT(3)

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