B: q_reg = _exec(aval, qval, inst1, inst2, ...);
C: int _exec(int aval, int qval, int inst1, ...);
_EXEC loads the A and Q registers with specified values, then executes a specified set of machine instructions. The result of _EXEC is the value that the Q register has after the instructions have been executed. You can obtain the value of the A register by executing
var = .null();
immediately after the call to _EXEC. This stores the A register value in "var".
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