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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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qecvt(3) Library Functions Manual qecvt(3)
qecvt, qfcvt, qgcvt - convert a floating-point number to a string
Standard C library (libc, -lc)
#include <stdlib.h>
[[deprecated]] char *qecvt(long double number, int ndigits,
int *restrict decpt, int *restrict sign);
[[deprecated]] char *qfcvt(long double number, int ndigits,
int *restrict decpt, int *restrict sign);
[[deprecated]] char *qgcvt(long double number, int ndigit, char *buf);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
qecvt(), qfcvt(), qgcvt():
Since glibc 2.19:
_DEFAULT_SOURCE
In glibc up to and including 2.19:
_SVID_SOURCE
The functions qecvt(), qfcvt(), and qgcvt() are identical to
ecvt(3), fcvt(3), and gcvt(3) respectively, except that they use a
long double argument number. See ecvt(3) and gcvt(3).
For an explanation of the terms used in this section, see
attributes(7).
┌─────────────────────────┬───────────────┬──────────────────────┐
│ Interface │ Attribute │ Value │
├─────────────────────────┼───────────────┼──────────────────────┤
│ qecvt() │ Thread safety │ MT-Unsafe race:qecvt │
├─────────────────────────┼───────────────┼──────────────────────┤
│ qfcvt() │ Thread safety │ MT-Unsafe race:qfcvt │
├─────────────────────────┼───────────────┼──────────────────────┤
│ qgcvt() │ Thread safety │ MT-Safe │
└─────────────────────────┴───────────────┴──────────────────────┘
None.
SVr4, SunOS, GNU.
These functions are obsolete. Instead, snprintf(3) is
recommended.
ecvt(3), ecvt_r(3), gcvt(3), sprintf(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 qecvt(3)
Pages that refer to this page: ecvt(3), ecvt_r(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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