3.1.1. Local State Variables
Exercise 3.1

Creation of accumulators

An accumulator is a procedure that is called repeatedly with a single numeric argument and accumulates its arguments into a sum. Each time it is called, it returns the currently accumulated sum. Write a procedure make-accumulator that generates accumulators, each maintaining an independent sum. The input to make-accumulator should specify the initial value of the sum, for example:

(define A (make-accumulator 5))
(A 10)
15
(A 10)
25


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