Finds the index of the first bit set in a string.

    Format

      #include  <strings.h>

      int ffs  (int iteger);

1 - Argument

 integer

    The integer to be examined for the first bit set.

2 - Description

    The ffs function finds the first bit set (beginning with the
    least significant bit) and returns the index of that bit. Bits
    are numbered starting at 1 (the least significant bit).

3 - Return Values

    x                  The index of the first bit set.
    0                  If index is 0.