11 lines
395 B
Text
11 lines
395 B
Text
(define (middle3 x)
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(if (even? (length x))
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(println "You entered " x ". I need an odd number of digits, not " (length x) ".")
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(if (< (length x) 3)
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(println "You entered " x ". Sorry, but I need 3 or more digits.")
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(println "The middle 3 digits of " x " are " ((- (/ (- (length x) 1) 2) 1) 3 (string (abs x))) ".")
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)
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)
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)
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(map middle3 lst)
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