2 bit adder subtractor

hi to all !!i am given a project to make a 2 bit processor which does only addition and subtraction...i know half adder and sub tractor ,but making them together is kinda difficult 4 me,,because i have never made them. could u please help me how to make it in work bench..any circuit diagram if u have.,

Maybe this will help. It's a truth table for your adder. ib0 and ib1 are your two inputs. op=0 for addition and op=1 for subtraction. ob0 is the output and carry is, well the carry bit. You can use any method (ie karnaugh maps) to obtain the functions.

PS: In the future, ask your technical questions in the tech forums or the homework forum for better responses.