Show how a 16-bit signed integer adder/subtracter can be used to add two signed operands, a, with 3 pre-binary-point and 9 post-binarypoint bits, and b, with 7 pre-binary-point and 5 post-binary-point bits, to produce a result with 7 pre-binary-point and 9 post-binary-point bits and no carry or overflow outputs.