gcvt - convert a floating-point number to a string

NAME  LIBRARY  SYNOPSIS  DESCRIPTION  RETURN VALUE  ATTRIBUTES  STANDARDS  HISTORY  SEE ALSO 

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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).

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)

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