gcvt(3)

NAME
gcvt - convert a floating-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 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 buf.

ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value
 | Thread safety | MT-Safe

STANDARDS
None.

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

SEE ALSO
ecvt(3), fcvt(3), sprintf(3)