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1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
2 .\"
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25 .\" References consulted:
26 .\" Linux libc source code
27 .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
28 .\" 386BSD man pages
29 .\" Modified Sat Jul 24 19:32:25 1993 by Rik Faith (faith@cs.unc.edu)
30 .TH GCVT 3 2017-09-15 "" "Linux Programmer's Manual"
31 .SH NAME
32 gcvt \- convert a floating-point number to a string
33 .SH SYNOPSIS
34 .nf
35 .B #include <stdlib.h>
36 .PP
37 .BI "char *gcvt(double " number ", int " ndigit ", char *" buf );
38 .fi
39 .PP
40 .in -4n
41 Feature Test Macro Requirements for glibc (see
42 .BR feature_test_macros (7)):
43 .in
44 .PP
45 .BR gcvt ():
46 .ad l
47 .PD 0
48 .RS 4
49 .TP 4
50 Since glibc 2.12:
51 .nf
52 (_XOPEN_SOURCE\ >=\ 500) ! (_POSIX_C_SOURCE\ >=\ 200112L)
53 || /* Glibc since 2.19: */ _DEFAULT_SOURCE
54 || /* Glibc versions <= 2.19: */ _SVID_SOURCE
55 .fi
56 .TP 4
57 Before glibc 2.12:
58 _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500
59 .\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
60 .RE
61 .PD
62 .ad b
63 .SH DESCRIPTION
64 The
65 .BR gcvt ()
66 function converts \fInumber\fP to a minimal length null-terminated
67 ASCII string and stores the result in \fIbuf\fP.
68 It produces \fIndigit\fP significant digits in either
69 .BR printf (3)
70 F format or E format.
71 .SH RETURN VALUE
72 The
73 .BR gcvt ()
74 function returns
75 \fIbuf\fP.
76 .SH ATTRIBUTES
77 For an explanation of the terms used in this section, see
78 .BR attributes (7).
79 .TS
80 allbox;
81 lb lb lb
82 l l l.
83 Interface Attribute Value
84 T{
85 .BR gcvt ()
86 T} Thread safety MT-Safe
87 .TE
88 .sp 1
89 .SH CONFORMING TO
90 Marked as LEGACY in POSIX.1-2001.
91 POSIX.1-2008 removes the specification of
92 .BR gcvt (),
93 recommending the use of
94 .BR sprintf (3)
95 instead (though
96 .BR snprintf (3)
97 may be preferable).
98 .SH SEE ALSO
99 .BR ecvt (3),
100 .BR fcvt (3),
101 .BR sprintf (3)