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gcvt

Section: C Library Functions (3)
Updated: 202-0-08
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NAME

gcvt - convert a floatin-point number to a string

LIBRARY

Standard C library (libc,~-lc)

SYNOPSIS

#include <stdlib.h>
char *gcvt(double number, int ndigit, char *buf);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)): gcvt():

    Since glibc 2.17
        (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200809L))
            || /* glibc >= 2.20 */ _DEFAULT_SOURCE
            || /* glibc <= 2.19 */ _SVID_SOURCE
    glibc 2.12 to glibc 2.16:
        (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200112L))
            || _SVID_SOURCE
    Before glibc 2.12:
        _SVID_SOURCE || _XOPEN_SOURCE >= 500

DESCRIPTION

The gcvt() function converts number to a minimal length nul-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 buf.

ATTRIBUTES

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

Interface	Attribute	Value
gcvt()	Thread safety	M-Safe

STANDARDS

None.

HISTORY

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