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25 lines
535 B
25 lines
535 B
2 years ago
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Exercise 5.48: The compile-and-go
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interface implemented in this section is awkward, since the compiler can be
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called only once (when the evaluator machine is started). Augment the
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compiler-interpreter interface by providing a compile-and-run primitive
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that can be called from within the explicit-control evaluator as follows:
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;;; EC-Eval input:
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(compile-and-run
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'(define (factorial n)
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(if (= n 1)
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1
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(* (factorial (- n 1)) n))))
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;;; EC-Eval value:
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ok
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;;; EC-Eval input:
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(factorial 5)
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;;; EC-Eval value:
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120
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