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I'm making n-bit ALU in scheme and I have a 1-bit ALU so far. Can someone tell me how to approach this problem? Here are the instructions for it:

The format of the procedure is 

  (ALUn selection x1 x2 n)

where the first parameter, selection can take any of the values: 'add, 'sub, 'and, 'or, or 'xor. The second and third parameters x1 and x2 are two n-bit binary numbers in list format.

Greg Hewgill
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Regina
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1 Answers1

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Here's the code for and, or xor:

(define (ALUn selection x1 x2 n)
  (cond
    [(or (not (= (length x1) n)) (not (= (length x2) n))) (error "Wrong register length!")]
    [(equal? selection 'and) (map bitwise-and x1 x2)]
    [(equal? selection  'or) (map bitwise-ior x1 x2)]
    [(equal? selection 'xor) (map bitwise-xor x1 x2)]))

You should figure how to do add and sub yourself!

Racket Noob
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