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/* gcc 4.7.2 */

#include <stdlib.h>

void f(int** const a)
{
  a = malloc(5 * sizeof(int)); // compile error
  a[0] = malloc(sizeof(int));
  *a[0] = 100;
}

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#include <stdio.h>
#include <stdlib.h>

typedef struct ReactiveInt* ReactiveInt;

struct ReactiveInt
{
  int n;
  int (*operator)(int, int);
  ReactiveInt left, right;

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object_files = \
frp_sample.o \
frp_sample_lib.o

.SUFFIXES : .c

frp_sample: $(object_files)
	gcc -Wall -o frp_sample $(object_files)

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#!/usr/bin/env ruby
# -*- mode: ruby -*-
require 'net/http'
require 'uri'
require 'nokogiri'

module AOJ
  extend self

  def get(id)

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#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <cstring>
#include <utility>
using namespace std;

typedef vector<vector<char> > B;
typedef pair<int, int> P;

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class RecordInstance
  attr_reader :klass, :members

  def initialize(klass, hash)
    unless klass.members.all?{|name, type| hash.has_key?(name) && hash[name].is_a?(type)}
      raise "Instance initialization error!!"
    end
    @klass = klass
    @members = klass.members.keys.inject({}){|acc, name| acc.merge(name => hash[name])}
  end

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{-# LANGUAGE Arrows #-}

import qualified FRP.Yampa as Y

type Inp = (String, String)
type Out = String

main = do
  rh <- Y.reactInit initIO act sf
  loop rh

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import qualified Data.ByteString as B
import GHC.IO.Handle
import System.Process
import System.IO

type Packet = B.ByteString

pktsize = 188

main = do

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require 'test/unit'
require './tiny_frp.rb'

module TinyFRP
  module UnitTest
    module Util
      def lift(&proc)
        TinyFRP::Lift.new(&proc)
      end

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#extern修飾子の意味

外部で定義される変数であることを宣言するための修飾子

ただし

extern修飾子を付けて変数aを宣言する => 変数aは外部定義される

は成り立つが、その逆