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);

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)