Question: In LISP, code the macro, -=, which is passed a variable which it decrements by the decrementValue and assigns the new value. The function value
In LISP, code the macro, -=, which is passed a variable which it decrements by the decrementValue and assigns the new value. The function value returned by -= should be the new value of numericVariable.
(-= numericVariable decrementValue)
Example:
> (setf x 5)
5
> (-= x 1)
4
> x
4
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