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• Nat-to-oct-chars

Nat-to-oct-chars-aux

Signature

(nat-to-oct-chars-aux n acc) → *

Arguments

n — Guard (natp n).

Definitions and Theorems

Function: nat-to-oct-chars-aux

(defun nat-to-oct-chars-aux (n acc)
 (declare (xargs :guard (natp n)))
 (let ((acl2::__function__ 'nat-to-oct-chars-aux))
  (declare (ignorable acl2::__function__))
  (mbe
   :logic
   (revappend (basic-nat-to-oct-chars n)
              acc)
   :exec
   (if (zp n)
       acc
    (nat-to-oct-chars-aux
     (the unsigned-byte
          (ash (the unsigned-byte n) -3))
     (cons
        (octal-digit-to-char (the (unsigned-byte 3)
                                  (logand (the unsigned-byte n) 7)))
        acc))))))