ffs - seek first set bit

Syntax	#include <strings.h> int ffs(int i);
Description	ffs() searches for the first set bit in the transferred argument, beginning with the leastsignificant bit, and returns the position of this bit. The numbering of the bits begins with 1, starting with the least-significant bit.
Return val.	Position of the first set bit
		if i != 0.
	0	if i = 0.
See also	strings.h.