Algorithms - Intro to Java ProgrammingYouTube↗  IA↗(long shot)
Education  13.3K views 20 likes 0 dislikes   23 Feb 2015
Udacity 651K subscribers United States YouTube↗


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You've just learned how to write some very simple programs and how to correct
これまでシンプルなプログラムの記述と エラーの修正方法
errors and to deal with all sorts of fussy details. Let's step back a little
小さな修正箇所の見つけ方を学んできました
bit and think about what a computer can do for us. A computer can execute an
少し基本に戻って 我々にとって コンピュータとは何かを考えてみましょう
algorithm. That's a technical term for a recipe of instructions that are
コンピュータはアルゴリズムを実行できます アルゴリズムとは指示の手順を意味する技術用語で
unambiguous, executable, and terminating. Well, those are big words. So let's
明瞭で実行可能 かつ終了する指示のことを言います
see what's going on. Unambiugous means that the recipe can be interpreted in
明瞭であるとは解釈が1つしかないということです
only one way. Executable means that its steps are those that a computer can
実行可能とはコンピュータが 実行できる指示であるという意味です
actually carry out. And terminating, of course, means that they come to an end.
そして終了するとは 指示に終わりがあるということです
That's all pretty abstract. Let's look at a concrete situation. You need to buy
非常に抽象的ですね　具体的な例を見てみましょう
a car. You have two choices: this beauty over here, it's cheap, but it has
みなさんは車を購入しなければなりません 2台の中から選びます
terrible gas mileage, or this sleek one over here, expensive, but great
風情があり安いけれど燃費が悪い車か ピカピカで高いけれど燃費がいい車
mileage. Which is the better buy? I'll show you an algorithm that makes that
どちらを購入すべきか アルゴリズムを使って論理的に決断します
decision. The first car costs $15,000. And the second car costs $30,000. So, it
上の車は15，000ドルで 下の車は30，000ドルです
looks like we should buy the first car. But, not so fast. The first car gets 10
価格でみると上の車がよさそうです でも待ってください
miles per gallon, and the second car 50 miles per gallon. So, what do you
上の車の燃費はガソリン1ガロン当たり10マイル 下は50マイルです
think? Which car should I buy? Do you think I should go for Car 1 or for Car 2?
どちらがいいのでしょう Car1かそれともCar2でしょうか
Or, in the end doesn't it really matter? Or maybe you don't have enough
もしくはどちらも同じなのか？
information to give an exact answer. Tell me what you think.
それともまだ情報不足でしょうか
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