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GCVT

Section: Linux Programmer's Manual (3)
Updated: 2017-09-15
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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 2.12:

(_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

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