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Held: Wednesday, 20 September 2006
Summary: Today we continue to explore files, particularly how one recurses over files.
anythingyou can do on the computer.
(write value port)
(display value port)
readdo when there's nothing left in the file? It returns a special value (which DrScheme displays as
(define recursive-proc (lambda (val) (if (base-case-test) (base-case val) (combine (partof val) (recursive-proc (simplify val))))))
(eof-object? (peek-char input-port))
(define recursive-proc (lambda (input-port other-params) (if (eof-object? (peek-char input-port)) (close-and-return input-port (base-case other-params)) (combine (read input-port) (recursive-proc input-port other-params))))) (define close-and-return (lambda (input-port return-value) (close input-port) return-value))
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