gcvt - convert a floating-point number to a string
#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
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 the address of the string pointed to by
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).
ecvt(3),
fcvt(3),
sprintf(3)