2 lowbit - index of lowest nonzero bit in binary representation of integer
13 If x is a nonzero integer, lowbit(x) returns the index of the
14 lowest nonzero bit in the binary representation of abs(x). Equivalently,
15 lowbit(x) is the greatest integer for which x/2^n is an integer;
16 the binary representation of x then ends with n zero bits.
19 > print lowbit(2), lowbit(3), lowbit(4), lowbit(-15), lowbit(2^27)
26 long zlowbit(ZVALUE x);