gcvt(3) - f31

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 2.12:
17               (_XOPEN_SOURCE >= 500) ! (_POSIX_C_SOURCE >= 200112L)
18                   || /* Glibc since 2.19: */ _DEFAULT_SOURCE
19                   || /* Glibc versions <= 2.19: */ _SVID_SOURCE
20           Before glibc 2.12:
21               _SVID_SOURCE || _XOPEN_SOURCE >= 500
22

DESCRIPTION

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

RETURN VALUE

29       The  gcvt()  function  returns  the address of the string pointed to by
30       buf.
31

ATTRIBUTES

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

CONFORMING TO

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

COLOPHON

51       This  page  is  part of release 5.02 of the Linux man-pages project.  A
52       description of the project, information about reporting bugs,  and  the
53       latest     version     of     this    page,    can    be    found    at
54       https://www.kernel.org/doc/man-pages/.
55
56
57
58                                  2017-09-15                           GCVT(3)