gcvt(3) | Library Functions Manual | gcvt(3) |
gcvt - convert a floating-point number to a string
Standard C library (libc, -lc)
#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
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.
The gcvt() function returns buf.
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value |
gcvt () | Thread safety | MT-Safe |
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).
2023-02-05 | Linux man-pages 6.03 |