gcvt(3)

GCVT(3)

Linux Programmer's Manual

GCVT(3)

NAME

gcvt - convert a floating-point number to a string

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).

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).