gcvt(3) - f35

1GCVT(3)                    Linux Programmer's Manual                   GCVT(3)
2
3
4

NAME

6       gcvt - convert a floating-point number to a string
7

SYNOPSIS

9       #include <stdlib.h>
10
11       char *gcvt(double number, int ndigit, char *buf);
12
13   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
14
15       gcvt():
16           Since glibc 2.17
17               (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200809L))
18                   || /* Glibc >= 2.20 */ _DEFAULT_SOURCE
19                   || /* Glibc <= 2.19 */ _SVID_SOURCE
20           Glibc versions 2.12 to 2.16:
21               (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200112L))
22                   || _SVID_SOURCE
23           Before glibc 2.12:
24               _SVID_SOURCE || _XOPEN_SOURCE >= 500
25

DESCRIPTION

27       The gcvt() function converts number to a minimal length null-terminated
28       ASCII string and stores the result in buf.  It produces ndigit signifi‐
29       cant digits in either printf(3) F format or E format.
30

RETURN VALUE

32       The gcvt() function returns buf.
33

ATTRIBUTES

35       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
36       tributes(7).
37
38       ┌────────────────────────────────────────────┬───────────────┬─────────┐
39       │Interface                                   │ Attribute     │ Value   │
40       ├────────────────────────────────────────────┼───────────────┼─────────┤
41       │gcvt()                                      │ Thread safety │ MT-Safe │
42       └────────────────────────────────────────────┴───────────────┴─────────┘
43

CONFORMING TO

45       Marked as LEGACY in POSIX.1-2001.  POSIX.1-2008 removes the  specifica‐
46       tion  of  gcvt(),  recommending  the  use of sprintf(3) instead (though
47       snprintf(3) may be preferable).
48

COLOPHON

53       This page is part of release 5.12 of the Linux  man-pages  project.   A
54       description  of  the project, information about reporting bugs, and the
55       latest    version    of    this    page,    can     be     found     at
56       https://www.kernel.org/doc/man-pages/.
57
58
59
60                                  2021-03-22                           GCVT(3)