Increase the length of the signed number S-M: add o bit after the signed-bite Others: add signed-bit before msB; Examples: S-M:0101=>00000101 1100 0000100 OTHERS:0101=>00000101 1100=>11111100Increase the length of the signed number S-M: add 0 bit after the signed-bit; Others : add signed-bit before MSB; Examples: S-M : 0101 => 0000 0101 1100 => 1000 0100 OTHERS: 0101 => 0000 0101 1100 => 1111 1100