Implementation of HACK ALU
Details of block diagram of HACK ALU, and control signals are given in a
Test case 1: x and y are positive, and x > y
Test case 2: x is positive and y is negative, and |x| > |y|
Each test case: Generate the outputs of ALU, i.e., Out, zr and ng, for each of the
18 combinations of control signals, i.e., zx, nx, zy, ny, f, no.