gcvt(3) — Linux manual pages

Linux manual pages	Section 3

Name

gcvt — convert a floating-point number to a string

Synopsis

        #include <stdlib.h>

`char *gcvt(`	double `number`,
	int `ndigit`,
	char *`buf)`;

Note

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
`gcvt`():
Since glibc 2.12:
(`_XOPEN_SOURCE` >= 500) ! (`_POSIX_C_SOURCE` >= 200112L) \|\| /* Glibc since 2.19:
/ `_DEFAULT_SOURCE` \|\| / Glibc versions <= 2.19:
*/ `_SVID_SOURCE`
Before glibc 2.12:
`_SVID_SOURCE` \|\| `_XOPEN_SOURCE` >= 500

DESCRIPTION

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

RETURN VALUE

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

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
`gcvt`()	Thread safety	MT-Safe

CONFORMING TO

Marked as LEGACY in POSIX.1-2001. POSIX.1-2008 removes the specification of gcvt(), recommending the use of sprintf(3) instead (though snprintf(3) may be preferable).

COLOPHON

This page is part of release 4.07 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man−pages/.

  Copyright 1993 David Metcalfe (davidprism.demon.co.uk)

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References consulted:
    Linux libc source code
    Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
    386BSD man pages
Modified Sat Jul 24 19:32:25 1993 by Rik Faith (faithcs.unc.edu)