練習問題/解答例/Scheme/練習問題解答例
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開始行:
*ループ1 [#i29c71f8]
(for-each print
(map
(lambda (_) "Hello World!")
(iota 5)))
*ループ2 [#s4350f12]
(define (foo n)
(for-each print
(map
(lambda (i)
(format #f "~a ~d" "Hello World!" (+ i 1...
(iota n))))
(define (main args)
(foo (string->number (list-ref args 1))))
*FizzBuzz [#l501edf8]
(print
(string-join
(map
(lambda (x)
(cond
((zero? (modulo x 15)) "FizzBuzz")
((zero? (modulo x 5)) "Buzz")
((zero? (modulo x 3)) "Fizz")
(else (format #f "~d" x))))
(iota 100 1))))
*素数判定 [#jd32f6c4]
(define (check-prime n d)
(if (> d (sqrt n))
#t
(if (zero? (modulo n d))
#f
(check-prime n (+ d 1)))))
(define (is-prime? n)
(if (< n 2)
#f
(check-prime n 2)))
(define prime?
(lambda (n)
(if (is-prime? n)
(print (format #f "~dは素数です。" n))
(print (format #f "~dは素数ではありません。" n)))))
(prime? 1)
(prime? 2)
(prime? 3)
(prime? 4)
(prime? 5)
(prime? 997)
(prime? 998)
(prime? 15485863)
(prime? 122949823)
(prime? 674506081)
(prime? 982451653)
*うるう年判定 [#l746f1d2]
(define (is-leap-year? n)
(cond
((zero? (modulo n 400)) #t)
((zero? (modulo n 100)) #f)
((zero? (modulo n 4)) #t)
(else #f)))
(define (leap-year? n)
(if (is-leap-year? n)
(print (format #f "~d年はうるう年です。" n))
(print (format #f "~d年はうるう年ではありません。" n...
(leap-year? 1992)
(leap-year? 2000)
(leap-year? 2001)
*累乗1 [#ybfcac36]
(define pow
(lambda (a n)
(if (zero? n)
1
(* a (pow a (- n 1))))))
(print (pow 2 10))
*フィボナッチ数列 [#l1f0f136]
(define fib-kernel
(lambda (current next remaining)
(if (zero? remaining)
current
(fib-kernel next (+ current next) (- remaining 1))...
(define fib
(lambda (n)
(fib-kernel 1 1 (- n 1))))
(define (main args)
(print (fib (string->number (list-ref args 1)))))
終了行:
*ループ1 [#i29c71f8]
(for-each print
(map
(lambda (_) "Hello World!")
(iota 5)))
*ループ2 [#s4350f12]
(define (foo n)
(for-each print
(map
(lambda (i)
(format #f "~a ~d" "Hello World!" (+ i 1...
(iota n))))
(define (main args)
(foo (string->number (list-ref args 1))))
*FizzBuzz [#l501edf8]
(print
(string-join
(map
(lambda (x)
(cond
((zero? (modulo x 15)) "FizzBuzz")
((zero? (modulo x 5)) "Buzz")
((zero? (modulo x 3)) "Fizz")
(else (format #f "~d" x))))
(iota 100 1))))
*素数判定 [#jd32f6c4]
(define (check-prime n d)
(if (> d (sqrt n))
#t
(if (zero? (modulo n d))
#f
(check-prime n (+ d 1)))))
(define (is-prime? n)
(if (< n 2)
#f
(check-prime n 2)))
(define prime?
(lambda (n)
(if (is-prime? n)
(print (format #f "~dは素数です。" n))
(print (format #f "~dは素数ではありません。" n)))))
(prime? 1)
(prime? 2)
(prime? 3)
(prime? 4)
(prime? 5)
(prime? 997)
(prime? 998)
(prime? 15485863)
(prime? 122949823)
(prime? 674506081)
(prime? 982451653)
*うるう年判定 [#l746f1d2]
(define (is-leap-year? n)
(cond
((zero? (modulo n 400)) #t)
((zero? (modulo n 100)) #f)
((zero? (modulo n 4)) #t)
(else #f)))
(define (leap-year? n)
(if (is-leap-year? n)
(print (format #f "~d年はうるう年です。" n))
(print (format #f "~d年はうるう年ではありません。" n...
(leap-year? 1992)
(leap-year? 2000)
(leap-year? 2001)
*累乗1 [#ybfcac36]
(define pow
(lambda (a n)
(if (zero? n)
1
(* a (pow a (- n 1))))))
(print (pow 2 10))
*フィボナッチ数列 [#l1f0f136]
(define fib-kernel
(lambda (current next remaining)
(if (zero? remaining)
current
(fib-kernel next (+ current next) (- remaining 1))...
(define fib
(lambda (n)
(fib-kernel 1 1 (- n 1))))
(define (main args)
(print (fib (string->number (list-ref args 1)))))
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