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



NAME
       gcvt - convert a floating-point number to a string

SYNOPSIS
       #include <stdlib.h>

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

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

       gcvt():
           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 && _XOPEN_SOURCE_EXTENDED

DESCRIPTION
       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.

RETURN VALUE
       The gcvt() function returns the address of the string pointed to by buf.

CONFORMING TO
       Marked  as LEGACY in POSIX.1-2001.  POSIX.1-2008 removes the specification of gcvt(), rec‐
       ommending the use of sprintf(3) instead (though snprintf(3) may be preferable).

SEE ALSO
       ecvt(3), fcvt(3), sprintf(3)

COLOPHON
       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 http://www.kernel.org/doc/man-pages/.



                                            2014-05-28                                    GCVT(3)