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'\" t
.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH qecvt 3 2025-05-17 "Linux man-pages (unreleased)"
.SH NAME
qecvt, qfcvt, qgcvt \- convert a floating-point number to a string
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.B #include <stdlib.h>
.P
.BI "[[deprecated]] char *qecvt(long double " number ", int " ndigits ,
.BI " int *restrict " decpt ", int *restrict " sign );
.BI "[[deprecated]] char *qfcvt(long double " number ", int " ndigits ,
.BI " int *restrict " decpt ", int *restrict " sign );
.BI "[[deprecated]] char *qgcvt(long double " number ", int " ndigit ", char *" buf );
.fi
.P
.RS -4
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.RE
.P
.BR qecvt (),
.BR qfcvt (),
.BR qgcvt ():
.nf
Since glibc 2.19:
_DEFAULT_SOURCE
In glibc up to and including 2.19:
_SVID_SOURCE
.fi
.\" FIXME . The full FTM picture looks to have been something like the
.\" following mess:
.\" glibc 2.20 onward
.\" _DEFAULT_SOURCE
.\" glibc 2.18 to glibc 2.19
.\" _BSD_SOURCE || _SVID_SOURCE
.\" glibc 2.10 to glibc 2.17
.\" _SVID_SOURCE || (_XOPEN_SOURCE >= 500 ||
.\" (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) &&
.\" ! (_POSIX_C_SOURCE >= 200809L))
.\" Before glibc 2.10:
.\" _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
.\" (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED)
.SH DESCRIPTION
The functions
.BR qecvt (),
.BR qfcvt (),
and
.BR qgcvt ()
are identical to
.BR ecvt (3),
.BR fcvt (3),
and
.BR gcvt (3)
respectively, except that they use a
.I "long double"
argument
.IR number .
See
.BR ecvt (3)
and
.BR gcvt (3).
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbx lb lb
l l l.
Interface Attribute Value
T{
.na
.nh
.BR qecvt ()
T} Thread safety MT-Unsafe race:qecvt
T{
.na
.nh
.BR qfcvt ()
T} Thread safety MT-Unsafe race:qfcvt
T{
.na
.nh
.BR qgcvt ()
T} Thread safety MT-Safe
.TE
.SH STANDARDS
None.
.SH HISTORY
SVr4, SunOS, GNU.
.\" Not supported by libc4 and libc5.
.P
These functions are obsolete.
Instead,
.BR snprintf (3)
is recommended.
.SH SEE ALSO
.BR ecvt (3),
.BR ecvt_r (3),
.BR gcvt (3),
.BR sprintf (3)
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