A sign bit is found in the left most position of the number and is know as most significant bit (MSB)which indicates the status of a number i.e. the number is positive or negative.
The signed __________ operator shifts a bit (or bits) to the right by the distance specified in the right operand and fills the left most bit by the sign bit.
The signed right shift (">>") operator shifts a bit (or bits) to the right by the distance specified in the right operand and fills the left most bit by the sign bit.
An unsigned shift operation of a negative number generally returns the result in a positive number, because any unsigned right shift operation replaces the leading sign bit with a zero which indicates a positive number.