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(display "Hello World!\n")

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(map (lambda (x) (* x x)) (list 1 2 3)) ;=> (1 4 9)

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(reduce + 0 (map (lambda (e) (* e 2)) (list 1 2 3)))

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# without for
Array.new(50) {|n| 2 * n + 1}.inject(:+)

# with for
s = 0
for i in (0..49) do
  s = s + lambda{|n| 2 * n + 1}.call(i)
end
s

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(define (make-list proc st en)
  (cond ((= st en) (cons (proc en) '()))
        (else (cons (proc st)
                    (make-list proc
                                     (+ st 1)
                                     en)))))

(reduce + 0 (make-list (lambda (n) (+ 1 (* 2 n))) 0 49))

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#include <stdio.h>

int sum_to_100(void);
int product_to_10(void);

int main (int argc, const char * argv[])
{
    sum_to_100();
    product_to_10();
    return 0;

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(define (enum-nums proc init limit)
  (if (> init limit)
    '()
    (cons init (enum-nums proc (proc init) limit))))
(define (accumulate op init seq)
  (if (null? seq)
    init
    (+ (car seq) (accumulate op init (cdr seq)))))

(accumulate + 0 (enum-nums (lambda (n) (+ 1 n)) 1 100))

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#include <stdio.h>
#define N 7

int min(int* nums, int len);
int max(int* nums, int len);
int first_appear(int* nums, int len, int target);

int main(int argc, char* argv[])
{
    int i, len, target;

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# -*- encoding:utf-8 -*-
#
# Usage
#
# tokyo = Weather.new :tokyo
# okinawa = Weather.new("沖縄")
# fuchu = Weather.new("東京都府中市")
#
# puts fuchu.get_weather(:today).to_s
# puts fuchu.get_weather(0).to_s

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# Ruby install 覚え書き

# gcc make gcc-c++ zlib-devel httpd-devel openssl-devel curl-devel libreadline-dev readline-dev あたりがはいっているか確認

# install rbenv
$ cd
$ git clone git://github.com/sstephenson/rbenv.git .rbenv
$ echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
$ echo 'eval "$(rbenv init -)"' >> ~/.bashrc
$ source ~/.bashrc