преобразовать число с плавающей запятой в строку (convert a floating-point number to a string)
Имя (Name)
qecvt, qfcvt, qgcvt - convert a floating-point number to a string
Синопсис (Synopsis)
#include <stdlib.h>
char *qecvt(long double number, int ndigits, int *restrict decpt,
int *restrict sign);
char *qfcvt(long double number, int ndigits, int *restrict decpt,
int *restrict sign);
char *qgcvt(long double number, int ndigit, char *buf);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
qecvt(), qfcvt(), qgcvt():
Since glibc 2.19:
_DEFAULT_SOURCE
In glibc up to and including 2.19:
_SVID_SOURCE
Описание (Description)
The functions qecvt(), qfcvt(), and qgcvt() are identical to
ecvt(3), fcvt(3), and gcvt(3) respectively, except that they use
a long double argument number. See ecvt(3) and gcvt(3).
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌─────────────────────────┬───────────────┬──────────────────────┐
│Interface │ Attribute │ Value │
├─────────────────────────┼───────────────┼──────────────────────┤
│qecvt() │ Thread safety │ MT-Unsafe race:qecvt │
├─────────────────────────┼───────────────┼──────────────────────┤
│qfcvt() │ Thread safety │ MT-Unsafe race:qfcvt │
├─────────────────────────┼───────────────┼──────────────────────┤
│qgcvt() │ Thread safety │ MT-Safe │
└─────────────────────────┴───────────────┴──────────────────────┘
Стандарты (Conforming to)
SVr4. Not seen in most common UNIX implementations, but occurs
in SunOS. Supported by glibc.
Примечание (Note)
These functions are obsolete. Instead, snprintf(3) is
recommended.
Смотри также (See also)
ecvt(3), ecvt_r(3), gcvt(3), sprintf(3)
