compiler problems?thx

I. (25%) Consider the following syntax-directed translation scheme for signed binary numbers: Number Sign List Number.val -Sign.val *List.val Sign-+ Sign.val-1 List ? Bit { List.val = Bit.val } Bit- 0 Bit.val-0 ISign.val-1 Listi Bit List.val 2 Listi.val+Bit.val 1 (Bit.val 1 ) For the input string:"+101" (a) (5%) Is the attribute "val" a synthesized attribute or inherited attribute? (b) (10%) Draw the annotated parse tree. (c) (10%) Draw the dependence graph for the attributes of the grammar symbols