найти первый установленный бит (find first set bit)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
ffs — find first set bit
Синопсис (Synopsis)
#include <strings.h>
int ffs(int i);
Описание (Description)
The ffs() function shall find the first bit set (beginning with
the least significant bit) in i, and return the index of that
bit. Bits are numbered starting at one (the least significant
bit).
Возвращаемое значение (Return value)
The ffs() function shall return the index of the first bit set.
If i is 0, then ffs() shall return 0.
Ошибки (Error)
No errors are defined.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
The Base Definitions volume of POSIX.1‐2017, strings.h(0p)
