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class ReportCard
  def initialize(print_strategy)
    @print_strategy = print_strategy.new
    @grades = Hash.new
  end

  def add_grade(subject, grade)
    @grades[subject] = grade
  end

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ANTELOPES = [:addax,:antelope,:antilopine,:ariel,:blackbuck,:blaubok,:bluebuck,:bloubok,:blesbok,:blesbuck,:bok,:bongo,:bontebok,:boschbok,:boshbok,:bosbok,:bubal,:bubale,:bubalis,:bubaline,:cabrie,:cabrit,:chamois,:chikara,:chinkara,:chiru,:dikdik,:duiker,:duyker,:duikerbok,:dzeren,:eland,:gazelle,:gemsbok,:gemsbuck,:gerenuk,:gnu,:goa,:gooral,:goral,:grysbok,:hartbees,:hartebeest,:hartbeest,:impala,:inyala,:nyala,:kaama,:klipspringer,:kob,:kongoni,:koodoo,:kudu,:lechwe,:madoqua,:marshbuck,:mhorr,:mohr,:nagor,:nilgai,:nilgau,:nilghai,:nilghau,:nylghai,:nylghau,:oribi,:ourebi,:oryx,:palebuck,:pallah,:prongbuck,:pronghorn,:puku,:pygarg,:reebok,:rhebok,:reedbuck,:reitbok,:saiga,:sasin,:sassaby,:tsessebe,:serow,:shamois,:sitatunga,:situtunga,:springbok,:springbuck,:steenbok,:steinbok,:steinbock,:stembok,:stembuck,:steenbuck,:thar,:topi,:tragelaph,:antelope,:antilopine,:ariel,:blackbuck,:blaubok,:bluebuck,:bloubok,:blesbok,:blesbuck,:bok,:bongo,:bontebok,:boschbok,:boshbok,:bosbok,:bubal,:bubale,:bubalis,:bubaline

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; SICP Exercise 1.1

10                                  => 10
(+ 5 3 4)                           => 12
(- 9 1)                             => 8
(/ 6 2)                             => 3
(+ (* 2 4) (- 4 6))                 => 6
(define a 3)
(define b (+ a 1)) 
(+ a b (* a b))                     => 19

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; SICP Exercise 1.8

#lang racket

(define (cube-root x)
        (define (square y) (* y y))
        (define (good-enough? guess)
                (< (abs (- (square guess) x)) 0.001))
        (define (improve guess)
                (/ (+ (square (/ guess x)) (* 2 guess))) 3)

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def add(m, n)
  total = m
  for i in 1..n do
    total += 1
  end
  total
end

def exp(m, n)
  total = 1

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#include <stdio.h>
#include <string.h>

#define MAXLEN 256

void reverse(char *s, char *r);

main() {
  char s[MAXLEN] = "hello reversed world!";
  char r[MAXLEN];

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# based on Heroku's documentation

require './streaming'
run Sinatra::Application

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$ pwd
/Users/gar/code/chef-repo
$ knife client list
tangleofwire-validator
$ diff client-config/validation.pem /etc/chef/validation.pem
$ diff client-config/validation.pem .chef/tangleofwire-validator.pem
$ sudo chef-client
[2012-08-11T12:05:26+01:00] INFO: *** Chef 10.12.0 ***
[2012-08-11T12:05:28+01:00] INFO: Client key /etc/chef/client.pem is not present - registering
[2012-08-11T12:05:29+01:00] INFO: HTTP Request Returned 403 Forbidden: Merb::ControllerExceptions::Forbidden

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13.591438 seconds on ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-linux]
6.887000 seconds on jruby 1.7.12 (1.9.3p392) 2014-04-15 643e292 on OpenJDK 64-Bit Server VM 1.7.0_55-b14 [linux-amd64]
24.593889 seconds on rubinius 2.2.6 (2.1.0 68d916a5 2014-03-10 JI) [x86_64-linux-gnu]

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(ns luhn)

(defn last-digit [n]
  (mod n 10))

(defn drop-last-digit [n]
  (long (/ n 10)))                                                                                                                                                                                              

(defn to-rev-digits
  ([n] (to-rev-digits n []))