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GCVT(3) Library Functions Manual 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 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

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)

2022-10-09 Linux man-pages 6.01