Data Representation (cont.)
	ä Signed Integers ä Need encoding for both positive and negative numbers ä Assume M bits in a register  word ä Use one bit (say the left most, most significant bit) to represent sign ä 0 => positive ä 1 => negative ä Encode magnitude with remaining M-1 bits ä Example for M=4 (+1)   0 001 (-1)   1 001       -------       1 010 =  -2 decimal??    Answer should be zero! ä Also, there are two representations of zero (+0)   0  000 (-0)    1  000