qecvt, qfcvt, qgcvt - convert a floating-point number to a string

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

       The  functions qecvt(), qfcvt(), and qgcvt() are identical to ecvt(3), fcvt(3), and gcvt(3) respectively,
       except that they use a longdouble argument number.  See ecvt(3) and gcvt(3).

       SVr4, SunOS, GNU.

       These functions are obsolete.  Instead, snprintf(3) is recommended.

       Standard C library (libc, -lc)

       qecvt, qfcvt, qgcvt - convert a floating-point number to a string

ecvt(3), ecvt_r(3), gcvt(3), sprintf(3)

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

       None.

#include<stdlib.h>[[deprecated]]char*qecvt(longdoublenumber,intndigits,int*restrictdecpt,int*restrictsign);[[deprecated]]char*qfcvt(longdoublenumber,intndigits,int*restrictdecpt,int*restrictsign);[[deprecated]]char*qgcvt(longdoublenumber,intndigit,char*buf);

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

       qecvt(), qfcvt(), qgcvt():
           Since glibc 2.19:
               _DEFAULT_SOURCE
           In glibc up to and including 2.19:
               _SVID_SOURCE