gcvt - Man Page

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 versions 2.12 to 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).

InterfaceAttributeValue
gcvt()Thread safetyMT-Safe

Standards

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).

See Also

ecvt(3), fcvt(3), sprintf(3)

Referenced By

ecvt(3), qecvt(3).

2022-10-09 Linux man-pages 6.01