gcvt(3) - Linux manual page (original) (raw)

gcvt(3) Library Functions Manual gcvt(3)

NAME top

   gcvt - convert a floating-point number to a string

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

   **#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 2.17
           (_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

DESCRIPTION top

   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)](../man3/printf.3.html) F format or E
   format.

RETURN VALUE top

   The **gcvt**() function returns _buf_.

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌──────────────────────────────────────┬───────────────┬─────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├──────────────────────────────────────┼───────────────┼─────────┤
   │ **gcvt**()                               │ Thread safety │ MT-Safe │
   └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

   None.

HISTORY top

   Marked as LEGACY in POSIX.1-2001.  POSIX.1-2008 removed it,
   recommending the use of [sprintf(3)](../man3/sprintf.3.html) instead (though [snprintf(3)](../man3/snprintf.3.html) may
   be preferable).

SEE ALSO top

   [ecvt(3)](../man3/ecvt.3.html), [fcvt(3)](../man3/fcvt.3.html), [sprintf(3)](../man3/sprintf.3.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 gcvt(3)

Pages that refer to this page:ecvt(3), qecvt(3)