gcvt - convert a floating-point number to a string

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                                                                   │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │ gcvt()                                                                      │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

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

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

       Standard C library (libc, -lc)

       gcvt - convert a floating-point number to a string

       The gcvt() function returns buf.

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

Linux man-pages 6.9.1                              2024-05-02                                            gcvt(3)

       None.

#include<stdlib.h>char*gcvt(doublenumber,intndigit,char*buf);

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

       gcvt():
           Since glibc 2.17
               (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200809L))
                   || /* glibc >= 2.20 */ _DEFAULT_SOURCE
                   || /* glibc <= 2.19 */ _SVID_SOURCE
           glibc 2.12 to glibc 2.16:
               (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200112L))
                   || _SVID_SOURCE
           Before glibc 2.12:
               _SVID_SOURCE || _XOPEN_SOURCE >= 500